Willi A. Brand
wbrand@bgc-jena.mpg.de

Short CV:

1950

born near Aachen, Germany

1957-69

School education in Porz near Cologne

1971-79

University Bonn, Chemistry

1979

Dipl. Chem., Diploma thesis about the internal energy distribution in Field Ionization (K. Levsen)

1981

Dr. rer. nat., PhD thesis about extraction of k(E) functions from FIK data (K. Levsen, H.D. Beckey)

1981-82

PostDoc (DFG Stipend) at the Univ. of North Carolina, Chapel Hill. (T. Baer). Fundamental kinetic studies using PEPICO

1982-84

PostDoc at the Univ. of Bonn (K. Levsen); Field Ionization Kinetics and Ion Spectroskopie (Laser-induced dissociation of mass selected ions)

1984-1998

Finnigan MAT, Bremen (Stable Isotopes instrumentation development group). Project manager, Program manager, development lab manager and group leader. Development of several mass spectrometers and sample preparation systems for stable isotope ratio analysis. Development and introduction of continuous flow measurement technology into the field.

1992-96

Executive board of the AGMS (now: German Society for Mass Spectrometry, DGMS)

1998-2015

Max-Planck-Institute for Biogeochemistry in Jena, Head of BGC IsoLab.

since 2016

Emeritus and Consultant

2010-2013

Chair of CIAAW (IUPAC Commission on Isotopic Abundances and Atomic Weights).

Specific tasks in the lab:
Head of the BGC Gas- and Isolab facilities, new developments, publications

Publications:

2018 - 2019

  1. Andrei Rodionov, Eva Lehndorff, Ciprian C. Stremtan, Willi A. Brand, Peter Königshoven, Wulf Amelung, In-situ mapping of natural 12C / 13C abundance in environmental samples using laser-ablation isotope ratio mass spectrometry, Anal. Chem., 2019, 91 (9), pp 6225–6232; https://pubs.acs.org/doi/10.1021/acs.analchem.9b00892
  2. Köster, Daniel, Sanchez Villalobos, Irene M., Jochmann, Maik A., Brand, Willi A., Schmidt, Torsten C., New concepts for the determination of oxidation efficiencies in liquid chromatography isotope ratio mass spectrometry, Anal. Chem., 2019, 91 (8), pp 5067–5073, https://pubs.acs.org/doi/10.1021/acs.analchem.8b05315.
  3. Markus Greule, Heiko Moossen, Heike Geilmann, Willi A. Brand, Frank Keppler, Methyl sulfates as methoxyl isotopic reference materials for δ13C and 2H measurements, Rapid Commun. Mass Spectrom. (2019) 33, 343-350; https://doi.org/10.1002/rcm.8355
  4. Nathaniel E. Ostrom, Hasand Gandhi, Tyler B. Coplen, Sakae Toyoda, J.K. Böhlke, Willi A. Brand, Karen L. Casciotti, Jens Dyckmans, Anette Giesemann, Joachim Mohn, Reinhard Well, Longfei Yu, Naohiro Yoshida, Preliminary assessment of stable nitrogen and oxygen isotopic composition of USGS51 and USGS52 nitrous oxide reference gases and perspectives on calibration needs, Rapid Commun. Mass Spectrom. 32 (2018) 1207–1214 https://onlinelibrary.wiley.com/doi/full/10.1002/rcm.8157
  5. Umezawa, T., Brenninkmeijer, C. A. M., Röckmann, T., van der Veen, C., Tyler, S. C., Fujita, R., Morimoto, S., Aoki, S., Sowers, T., Schmitt, J., Bock, M., Beck, J., Fischer, H., Michel, S. E., Vaughn, B. H., Miller, J. B., White, J. W. C., Brailsford, G., Schaefer, H., Sperlich, P., Brand, W. A., Rothe, M., Blunier, T., Lowry, D., Fisher, R. E., Nisbet, E. G., Rice, A. L., Bergamaschi, P., Veidt, C., and Levin, I.: Interlaboratory comparison of δ13C and δD measurements of atmospheric CH4 for combined use of data sets from different laboratories, Atmos. Meas. Tech., 11, 1207-1231, https://doi.org/10.5194/amt-11-1207-2018, 2018

2016 - 2017

  1. Haiping Qi, Tyler B. Coplen, Matthias Gehre, Torsten W. Vennemann, Willi A. Brand , Heike Geilmann, Gerard Olack, Ilya Bindeman, Jim Palandri, Li Huang, Fred Longstaffe, New biotite and muscovite isotopic reference materials, USGS57 and USGS58, for δ2H measurements–a replacement for NBS 30, Chemical Geology 467C (2017) pp. 89-99; DOI:10.1016/j.chemgeo.2017.07.027; web-link
  2. Diana Mance, Heike Geilmann, Willi A. Brand, Thorben Kewitz, Holger Kersten, Changes of 2H and 18O abundances in water treated with non-thermal atmospheric pressure plasma jet, Plasma Process. Polym. 2017, Early View, DOI: 10.1002/ppap.201600239 web-link
  3. Matthias Gehre, Julian Renpenning, Heike Geilmann, Haiping Qi, Tyler B. Coplen, Steffen Kümmel, Natalija Ivdra, Willi A. Brand, Arndt Schimmelmann, Optimization of on-line hydrogen stable isotope-ratio measurements of halogen- and sulfur-bearing organic compounds using elemental analyzer chromium/high-temperature conversion (EA–Cr/HTC–IRMS), Rapid Commun. Mass Spectrom. (2017), 31, 475–484, DOI 10.1002/rcm.7810 web-link
  4. Joachim Mohn, Wilhelm Gutjahr, Sakae Toyoda, Eliza Harris, Erkan Ibraim, Heike Geilmann, Patrick Schleppi, Thomas Kuhn, Moritz F. Lehmann, Charlotte Decock, Roland A. Werner, Naohiro Yoshida, and Willi A. Brand, Reassessment of the NH4NO3 thermal decomposition technique for calibration of the N2O isotopic composition, Rapid Commun. Mass Spectrom. 30 (2016) 2487–2496, DOI: 10.1002/rcm.7736 web-link
  5. Willi A. Brand, Michael Rothe, Peter Sperlich, Martin Strube, and Magnus Wendeberg, Automated simultaneous measurement of the δ13C and δ2H values of methane and the δ13C and δ18O values of carbon dioxide in flask air samples using a new multi cryo-trap/gas chromatography/isotope ratio mass spectrometry system, Rapid Commun. Mass Spectrom. 30 (2016) 1523–1539; DOI: 10.1002/rcm.7587 web-link
  6. Arndt Schimmelmann, Haiping Qi, Tyler B. Coplen, Willi A. Brand, Jon Fong, Wolfram Meier-Augenstein, Helen Felicity Kemp, Blaza Toman, Annika Ackermann, Sergey Assonov, Anita Aerts-Bijma, Ramona Brejcha, Yoshito Chikaraishi, Tamim A. Darwish, Martin Elsner, Matthias Gehre, Heike Geilmann, Manfred Groening , Jean-François Hélie, Sara Herrero-Martín, Harro A.J. Meijer, Peter E. Sauer, Alex Lee Sessions, and Roland A. Werner, New organic reference materials for hydrogen, carbon, and nitrogen stable isotope-ratio measurements: caffeines, n-alkanes, fatty acid methyl esters, glycines, L-valines, polyethylenes and oils; Analytical Chemistry 2016, Anal. Chem. 88, 4294-4302 (2016) DOI: 10.1021/acs.analchem.5b04392 web-link
  7. Haiping Qi, Tyler B. Coplen, Stan Mroczkowski, Willi A. Brand, Lauren Brandes, Heike Geilmann, and Arndt Schimmelmann, A new organic reference material, glutamic acid, USGS41a for δ13C and δ15N measurements−a replacement for USGS41, RCM 30 (2016) 859–866, DOI: 10.1002/rcm.7510 web-link
  8. Juris Meija, Tyler B. Coplen, Michael Berglund, Willi A. Brand, Paul De Bièvre,Manfred Gröning, Norman E. Holden, Johanna Irrgeher, Robert D. Loss,Thomas Walczyk and Thomas Prohaska, Atomic weights of the elements 2013 (IUPAC Technical Report), Pure and Applied Chemistry 88; 265-291 (2016); DOI 10.1515/pac-2015-0305 web-link
  9. Juris Meija, Tyler B. Coplen, Michael Berglund, Willi A. Brand, Paul De Bièvre,Manfred Gröning, Norman E. Holden, Johanna Irrgeher, Robert D. Loss,Thomas Walczyk and Thomas Prohaska, Isotopic compositions of the elements 2013 (IUPAC Technical Report), Pure and Applied Chemistry 88; 293-306 (2016); DOI 10.1515/pac-2015-0503 web-link
  10. Thomas Röckmann, Simon Eyer, Carina van der Veen, Maria E. Popa, Béla Tuzson, Guillaume Monteil, Sander Houweling, Eliza Harris, Dominik Brunner, Hubertus Fischer, Giulia Zazzeri, David Lowry, Euan G. Nisbet, Willi A. Brand, Jaroslav M. Necki, Lukas Emmenegger, and Joachim Mohn, In-situ observations of t he isotopic composition of methane at the Cabauw tall tower site, Atmos. Chem. Phys., 16, 10469–10487, 2016, doi:10.5194/acp-16-10469-2016 web-link
  11. Sperlich, P., Uitslag, N. A. M., Richter, J. M., Rothe, M., Geilmann, H., van der Veen, C., Röckmann, T., Blunier, T., and Brand, W. A, Development and evaluation of a suite of reference gases for CH4 in synthetic air, Atmos. Meas. Tech., 9, 3717–3737 (2016) doi:10.5194/amt-9-3717-2016 web-link
  12. Simon Eyer, Béla Tuzson, Maria E. Popa, Carina van der Veen, Thomas Röckmann, Michael Rothe, Willi A. Brand, Rebecca Fisher, David Lowry, Euan G. Nisbet, Matthias S. Brennwald, Eliza Harris, Christoph Zellweger, Lukas Emmenegger, Hubertus Fischer and Joachim Mohn, Real-time analysis of δ13C- and δD-CH4 in ambient air with laser spectroscopy: method development and first intercomparison results, AMT 9, 263-280(2016), doi:10.5194/amt-9-263-2016 web-link

2014 - 2015

  1. Matthias Gehre, Julian Renpenning, Tetyana Gilevska, Haiping Qi, Tyler B. Coplen, Harro A.J. Meijer, Willi A. Brand, and Arndt Schimmelmann, On-line hydrogen-isotope measurements of organic samples using elemental chromium—an extension for high temperature elemental-analyzer techniques, Anal. Chem. 87 (2015), 5198−5205 web-link
  2. Sreejesh Nair, Heike Geilmann, Tyler Coplen, Haiping Qi, Matthias Gehre, Arndt Schimmelmann, and Willi A. Brand, Isotopic disproportionation during hydrogen isotopic analysis of nitrogen-bearing organic compounds; Rapid Commun. Mass Spectrom. (2015) 29, 878–884, DOI 10.1002/rcm7174 web-link
  3. Brand W.A., C.B. Douthitt, F. Fourel, R. Maia, C. Rodrigues, C. Maguas, and T. Prohaska, Gas Source Isotope Ratio Mass Spectrometry (IRMS), in: Sector Field Mass Spectrometry for Elemental and Isotopic Analysis, Eds. Thomas Prohaska, Johanna Irrgeher, Andreas Zitek, Norbert Jakubowski, ISBN: 978-1-84973-392-2, Chapter 16, pp 500-549. (2015); DOI 10.1039/9781849735407-00500 web-link
  4. M. Riederer, J. Hübner, J. Ruppert, W.A. Brand, T. Foken: Prerequisites for application of hyperbolic relaxed eddy accumulation on managed grasslands and alternative net ecosystem exchange flux partitioning, Atmos. Meas. Tech., 7, 4237-4250, (2014); doi:10.5194/amt-7-4237-2014 web-link
  5. Willi A. Brand, Tyler B. Coplen, Jochen Vogl, Martin Rosner, Thomas Prohaska, Assessment of International Reference Materials for Stable Isotope Ratio Analysis 2013 (IUPAC Technical Report), Pure and Applied Chemistry 86; 425-467 (2014); DOI 10.1515/pac-2013-1023 web-link
  6. M. E. Popa, M. K. Vollmer, A. Jordan, W. A. Brand, S. Pathirana, M. Rothe, T. Röckmann, Vehicle emissions of greenhouse gases and related tracers from a tunnel study: CO:CO2, N2O:CO2, CH4:CO2, O2:CO2 ratios, and the stable isotopes 13C and 18O in CO2 and CO, Atmos. Chem. Phys. 14, 2105-2123, 2014, DOI:10.5194/acp-14-2105-2014 web-link
  7. Giovanna Battipaglia, Veronica De Micco, Willi A. Brand, Matthias Saurer, Giovanna Aronne, Petra Linke, Paolo Cherubini, Drought impact on water use efficiency and intra-annual density fluctuations in Erica arborea on Elba (Italy). Plant Cell and Environment (2014) 37,382–391 web-link
  8. LiXin Liu, LingXi Zhou, Bruce Vaughn, John B. Miller, Willi A. Brand, Michael Rothe and Xia LingJun, Background variations of atmospheric CO2 and carbon stable isotopes at Waliguan (WLG) and Shangdianzi (SDZ) stations in China, Journal of Geophysical Research: Atmospheres 2014, (DOI: 10.1002/2013JD019605) web-link

2012 - 2013

  1. Michael E. Wieser, Willi A. Brand, Isotope Ratio Studies Using Mass Spectrometry, Reference Module in Chemistry, Molecular Sciences and Chemical Engineering, Elsevier 2013; DOI:10.1016/B978-0-12-409547-2.05243-4; web-link
  2. Coplen, T. B., Brand, W. A., Meija, J., Gröning, M., Holden, N.E., Berglund, M., De Bièvre, P., Loss, R. D., Prohaska, T., Walczyk, T., 2013, Atomic weights of the elements 2013 (xls), available only online at http://www.ciaaw.org/pubs/TSAW2013_xls.xls
  3. Michael E. Wieser, Norman Holden, Tyler B. Coplen, John K. Böhlke, Michael Berglund, Willi A. Brand, Paul De Bièvre, Manfred Gröning, Robert D. Loss, Juris Meija, Takafumi Hirata, Thomas Prohaska, Ronny Schoenberg, Glenda O’Connor, Thomas Walczyk, Shige Yoneda, and Xiang-Kun Zhu, Atomic weights of the elements 2011 (IUPAC Technical Report), Pure Appl. Chem. 85 (5) 1047-1078 (2013); DOI: 10.1351/PAC-REP-13-03-02 web-link
  4. Almuth Hammerbacher, Axel Schmidt, Namita Wadke, Louwrance P. Wright, Bernd Schneider, Joerg Bohlmann, Willi A. Brand, Trevor M. Fenning, Jonathan Gershenzon, and Christian Paetz, A common fungal associate of the spruce bark beetle metabolizes the stilbene defenses of Norway spruce, Plant Physiology 162 (2013) 1324-1336; (doi:10.1104/pp.113.218610)
  5. Willi A. Brand, Atomic weights: not so constant after all, Analytical and Bioanalytical Chemistry 405, (9) 2755-2761, 2013 DOI10.1007/s00216-012-6608-0 web-link
  6. M. Wendeberg, J. M. Richter, M. Rothe, W.A. Brand, Jena Reference Air Set (JRAS): a multi-point scale anchor for isotope measurements of CO2 in air, Atmos. Meas. Tech., 6, 817-822, 2013; doi:10.5194/amt-6-817-2013 web-link
  7. Van der Laan-Luijkx IT, Van der Laan S, Uglietti C, Schibig MF, Neubert REM, Meijer HAJ, Brand WA, Jordan A, Richter JM, Rothe M, Leuenberger MC, Atmospheric CO2, δ(O2/N2) and δ13CO2 measurements at Jungfraujoch, Switzerland: results from a flask sampling intercomparison program, , Atmos. Meas. Tech., 6, 1805–1815, 2013 web-link
  8. Willi A. Brand and Tyler B. Coplen, Stable isotope deltas: tiny, yet robust signatures in nature, Isotopes in Environmental and Health Studies (2012) 48, 393-409 (DOI: 10.1080/10256016.2012.666977) submitted version published version
  9. J. Mohn, B. Tuzson, A. Manninen, N. Yoshida, S. Toyoda, W.A. Brand, L. Emmenegger, Site selective real-time measurements of atmospheric N2O isotopomers by laser spectroscopy, AMT 5, 1601 (2012) http://www.atmos-meas-tech.net/5/1601/2012/amt-5-1601-2012.pdf
  10. Veronica De Micco, Giovanna Battipaglia, Willi A. Brand, Petra Linke, Matthias Saurer, Giovanna Aronne, Paolo Cherubini, Discrete versus continuous analysis of anatomical and δ13C variability in tree rings with intra-annual density fluctuations, Trees – Structure and Function (2012) 26, 513-524 (DOI_10.1007/s00468-011-0612-4)
  11. Ruppert J, Riederer M, Brand WA and Foken, T, Whole-air relaxed eddy accumulation for the measurement of isotope and trace-gas fluxes, Schriftenreihe: Arbeitsergebnisse / Universität Bayreuth, Abteilung Mikrometeorologie, Arbeitsergebnisse Nr. 51 (2012) http://opus.ub.uni-bayreuth.de/volltexte/2012/1001/pdf/ARBERG051.pdf

2010 - 2011

  1. Magnus Wendeberg, Jürgen M. Richter, Michael Rothe, and Willi A. Brand, δ18O Anchoring to VPDB: Calcite Digestion with 18O-adjusted ortho-Phosphoric Acid, Rapid Comm. Mass Spectrom. (2011) 25, 851-860
  2. M. Schumacher, R.A. Werner, H.A.J. Meijer, H.G. Jansen, W.A. Brand, H. Geilmann, R.E.M. Neubert, Oxygen Isotopic Signature of CO2 from Combustion Processes, Atmos.Chem.Phys. 11; 1473-1490 (2011) (doi:10.5194/acp-11-1473-2011)
  3. L. Huang, A. Chivulescu, C. Allison, G. Brailsford, W. A. Brand, M. Wendeberg, A. Bollenbacher, R. Keeling, I. Levin, M. Sabasch, M. Leuenberger, H. Mukai, T. Nakazawa, S. Aoki, R. Neubert, A. Aerts-Bijma, M. Verkouteren, J. White, B. Vaughn, S. Michel, L. Zhou, L.X. Liu, A Report of δ13C & δ18O Measurements in NBS 19 and NBS 18 pure CO2: Uncertainty in Traceability of CO2 Isotope Measurements, Proceedings of the 15th IAEA/WMO meeting of CO2 experts, Jena, Sept. 2009, WMO-GAW Report 194, ed. W.A. Brand (2011) 169-175 (http://www.wmo.int/pages/prog/arep/gaw/gaw-reports.html)
  4. Magnus Wendeberg, Juergen M. Richter, Michael Rothe, and Willi A. Brand, JRAS isotope reference: A generalized VPDB scale anchor for CO2 in air?, Proceedings of the 15th IAEA/WMO meeting of CO2 experts, Jena, Sept. 2009, WMO-GAW Report 194, ed. W.A. Brand (2011) 180-185 (http://www.wmo.int/pages/prog/arep/gaw/gaw-reports.html)
  5. Giovanna Battipaglia, Veronica de Micco, Willi A. Brand, Petra Linke, Giovanna Aronne, Matthias Saurer, and Paolo Cherubini, Variations of vessel diameter and δ13C in false rings of Arbutus unedo L. reflect different environmental conditions, New Phytologist 2010; 188: 1099–1112 doi: 10.1111/j.1469-8137.2010.03443.x
  6. W.A. Brand, Comments on ‘‘Discrepancies between isotope ratio infrared spectroscopy and isotope ratio mass spectrometry for the stable isotope analysis of plant and soil waters’’, Rapid Comm. Mass Spectrom. 2010, 24: 2687-2688
  7. Magnus Wendeberg and Willi A. Brand, “Isotope ratio mass spectrometry (IRMS) of light elements (C, H, O, N, S): The principles and characteristics of the IRMS instrument” in Encyclopedia of Mass Spectrometry Vol 5, ed. Diane Beauchemin and Dwight E. Matthews, Elsevier, Amsterdam, 2010 pp 739-748
  8. Haiping Qi, Manfred Gröning, Tyler B. Coplen, Bryan Buck, Stanley J. Mroczkowski , Willi A. Brand, Heike Geilmann, and Matthias Gehre, Novel silver tubing method for quantitative introduction of water into high temperature conversion systems for stable hydrogen and oxygen isotopic measurements, Rapid Comm. Mass Spectrom. 2010; 24:1821-18277 more
  9. Thomas Röckmann, Catalina X. Gómez Álvarez, Sylvia Walter, Carina van der Veen, Adam G. Wollny, Sachin S. Gunthe, Günther Helas, Ulrich Pöschl, Frank Keppler, Markus Greule and Willi A. Brand, Isotopic composition of H2 from wood burning: Dependency on combustion efficiency, moisture content and δD of local precipitation, J. Geophys. Research 115 (2010), D17308, 1-11 (doi:10.1029/2009JD013188)
  10. Willi A. Brand, Sergey S. Assonov, Tyler B. Coplen, Correction for the 17O interference in δ(13C) determinations when analyzing CO2 with stable isotope mass spectrometry, (IUPAC Technical Report), Pure Appl. Chem., (2010), 2010; 82 (8), 1719–1733 (doi:10.1351/PAC-REP-09-01-05)
  11. Lloyd J, Patiño S, Paiva RQ, Nardoto GB, Quesada CA, Santos AJB, Baker TR, Brand WA, Hilke I, Geilmann H, Raessler M, Luizão FJ, Martinelli LA and Mercado LM, Optimisation of photosynthetic carbon gain and within-canopy gradients of associated foliar traits for Amazon forest trees. Biogeosciences 2010; 7, 1833–1859 (doi:10.5194/bg-7-1833-2010)
  12. Quesada CA, Lloyd J, Schwarz M, Patiño S, Baker TR, Czimczik C, Fyllas NM, Martinelli L, Nardoto GB, Schmerler J, Santos AJB, Hodnett MG, Herrera R, Luizão FJ, Arneth A, Lloyd G, Dezzeo N, Hilke I, Kuhlmann I, Raessler M, Brand WA, Geilmann H, Moraes Filho JO, Carvalho FP, Araujo Filho RN, Chaves JE, Cruz Junior OF, Pimentel TP and Paiva R, Variations in chemical and physical properties of Amazon forest soils in relation to their genesis. Biogeosciences 2010, 7: 1515-1542
  13. I. Vigano, T. Röckmann, R. Holzinger, F. Keppler, M. Greule, W.A. Brand, H. Geilmann, H. van Weelden, Water drives the deuterium content of the methane emitted from plants, Geochimica et Cosmochimica Acta 74 (2010) 3865–3873 more

2008 - 2009

  1. Willi. A. Brand, Alina Chivulescu, Lin Huang, Hitoshi Mukai, Juergen M. Richter, and Michael Rothe, Inter-laboratory calibration of CO2 produced from NBS19 calcite, calibration of Narcis-II, and CO2-isotopes in synthetic air, Proceedings of the 14th IAEA/WMO meeting of CO2 experts, Helsinki, Sept. 2007, WMO-GAW Report 186, ed. T. Laurila (2009), 48-55 more
  2. Willi A. Brand, Heike Geilmann, Eric R. Crosson, and Chris W. Rella, Cavity Ring-Down Spectroscopy versus High-Temperature Conversion Isotope Ratio Mass Spectrometry; a case study on δ2H and δ18O of pure water samples and alcohol/water mixtures. Rapid Comm. Mass Spectrom. 2009; 23: 1879-1884 (DOI: 0.1002/rcm.4083) more
  3. Vaganov, EA, ЕD Schulze, MV Skomarkova. A Knohl, WA Brand, C Roscher, Intra-annual variability of anatomical structure and δ13С values within tree rings of spruce and pine in alpine, temperate and boreal Europe, Oecologia (2009) 161:729–745
  4. I. Vigano, T. Röckmann, R. Holzinger, A. van Dijk, F. Keppler, M. Greule, W.A. Brand, H. Geilmann, H. van Weelden, The stable isotope signature of methane emitted from plant material under UV irradiation, Atmospheric Environment (2009), doi:10.1016/j.atmosenv.2009.07.046
  5. Willi A. Brand, Tyler B. Coplen, Anita T. Aerts‑Bijma, J.K. Böhlke, Matthias Gehre, Heike Geilmann, Manfred Groening, Henk G. Jansen, Harro A.J. Meijer, Stanley J. Mroczkowski, Haiping Qi, Karin Soergel, Hilary Stuart-Williams, Stephan Weise, and Roland A. Werner, Comprehensive Inter-Laboratory Calibration of Reference Materials for δ18O versus VSMOW using Various on-Line High-Temperature Conversion Techniques, Rapid Comm. Mass Spectrom. 2009; 23: 999-1019 (DOI: 10.1002/rcm.3958)
  6. Willi A. Brand, Lin Huang, Hitoshi Mukai, Alina Chivulescu, Juergen M. Richter, and Michael Rothe, How well do we know VPDB; Variability of δ13C and δ18O in CO2 generated form NBS19-Calcite, Rapid Comm. Mass Spectrom. 2009; 23: 915–926 (DOI: 10.1002/rcm.3940)
  7. Willi A. Brand, ‘Maintaining High Precision of Isotope Ratio Analysis over Extended Periods of Time’, Proceedings of the IAEA International Symposium on Quality Assurance for Analytical Methods in Isotope Hydrology, Vienna, Aug. 25-27 (2004), Isotopes in Environmental and Health Studies, 2009; 45: 135-149 (DOI: 10.1080/10256010902869097)

2006 - 2007

  1. Lars W. Clement, Stephan C.W. Köppen , Willi A. Brand and Martin Heil, Strategies of a parasite of the ant – Acacia mutualism, Behavioral Ecology and Sociobiology, (2007) DOI10.1007/s00265-007-0520-1
  2. Elena Hettmann, Willi A. Brand, Gerd Gleixner, Improved isotope ratio measurement performance in liquid chromatography - isotope ratio mass spectrometry by removing excess oxygen. Rapid Commun. Mass Spectrom. 2007; 21: 4135–4141
  3. T. B. Coplen, W. A. Brand, M. Gehre, M. Groening, H. A. J. Meijer, B. Toman, and R. M. Verkouteren, After two decades a second anchor for the VPDB δ13C scale, Rapid Comm. Mass Spectrom., (2006) 20: 3165; (DOI: 10.1002/rcm.2727; more
  4. T. B. Coplen, W. A. Brand, M. Gehre, M. Groening, H. A. J. Meijer, B. Toman, and R. M. Verkouteren, New Guidelines for δ13C Measurements, Analytical Chemistry, Chemistry (2006) 78; 2439-2441 (DOI: 10.1021/ac052027c; more
  5. W. A. Brand, M. Rothe, J. M. Richter, Relating Air-CO2 Isotope Ratio Determinations to VPDB using Calcite-CO2 Mixed into CO2-free Air, Proceedings of the 13th IAEA/WMO meeting of CO2 experts, Boulder, Sept. 2005, WMO-GAW Report 168, ed. J.B. Miller (2007), 36-40 more
  6. Hitoshi Mukai, Takakiyo Nakazawa, Willi A. Brand, Lin Huang, Colin Allison, James White, Markus Leuenberger, About disagreements in inter-comparison activities of isotope ratio measurements for CO2, Proceedings of the 13th IAEA/WMO meeting of CO2 experts, Boulder, Sept. 2005, WMO-GAW Report 168, ed. J.B Miller (2007), 41-46 more

2004 - 2005

  1. Prosenjit Ghosh, Michael Patecki, Michael Rothe, and Willi A. Brand, Calcite-CO2 Mixed into CO2-free Air: A New CO2‑in-Air Stable Isotope Reference Material for the VPDB Scale, Rapid Comm. Mass Spectrom., (2005), 19: 1097-1119
  2. U. Seibt, W.A. Brand, M. Heimann, J. Lloyd, J.P. Severinghaus and L. Wingate, Observations of O2 : CO2 exchange ratios during ecosystem gas exchange, Global Biogeochemical Cycles 18 (2004) GB4024
  3. M. Gehre, H. Geilmann, J.M. Richter, R.A. Werner, and W.A. Brand, Continuous Flow 2H/1H and 18O/16O Analysis of Water Samples with Dual Inlet Precision Rapid Comm. Mass Spectrom. (2004) 18: 2650–2660
  4. Alexander Knohl, Roland A. Werner, Heike Geilmann and Willi A. Brand, Kel-FTM discs improve storage time of canopy air samples in 10-mL vials for CO213C analysis, Rapid Comm. Mass Spectrom. (2004) 18: 1663–1665
  5. Alexander Knohl, Roland A. Werner, Willi A. Brand, Nina Buchmann, Short-term variations in δ13C of ecosystem respiration reveals link between assimilation and respiration in a deciduous forest, Oecologia (2005) 142: 70-82; more
  6. Willi A. Brand, O2/N2 Storage Aspects and Open Split Mass Spectrometric Determination, Proceedings of the 12th IAEA/WMO meeting of CO2 experts, Toronto, Sept. 2003, WMO-GAW Report 161, ed. D. Worthy and L. Huang (2005) 146-151; more
  7. Prosenjit Ghosh and Willi A. Brand, Isotopic analysis of CO2 in air samples: Requirements for a new CO2 in-air standard and preparation of an air-CO2 reference mixture from calcite material, Proceedings of the 12th IAEA/WMO meeting of CO2 experts, Toronto, Sept. 2003, WMO-GAW Report 161, ed. D. Worthy and L. Huang (2005) 50-57; more
  8. Michael Rothe, Armin Jordan and Willi A. Brand, Trace gases, δ13C and δ18O of CO2-in-air samples: Storage in glass flasks using PCTFE seals and other effects, Proceedings of the 12th IAEA/WMO meeting of CO2 experts, Toronto, Sept. 2003, WMO-GAW Report 161, ed. D. Worthy and L. Huang (2005) 64-70; more
  9. I. Levin, C. Facklam, M. Schmidt, M. Ramonet, P. Ciais, R. Langenfelds, C. Allison, R. Francey, A. Jordan, M. Rothe, W. A. Brand, R.E.M. Neubert, H.A.J. Meijer, T. Machida and H. Mukai, TACOS Sausage Flask Intercomparison Report 2003, 2nd annual report of the TACOS project 2004 Levin et al.; Sausage Report (TACOS)
  10. W. A. Brand, 'Mass Spectrometer Hardware for Analyzing Stable Isotope Ratios', Chapter 38 in 'Handbook of Stable Isotope Analytical Techniques', Vol. 1, ed. P.A. de Groot, Elsevier Science, (ISBN: 0-444-51114-8) 2004, 835-856
  11. Prosenjit Ghosh and Willi A. Brand, The effect of N2O on the isotopic composition of air-CO2 samples, Rapid Comm. Mass Spectrom.18 (2004) 1830-1838
  12. P. Sturm, M. Leuenberger, C. Sirignano, R. Neubert, H.A.J. Meijer, R. Langenfelds, W.A. Brand and Y. Tohjiama, Permeation of atmospheric gases through polymer O-rings used in flasks for air sampling, J. Geophys. Res. 109, D04309 (2004)
  13. B. Schulze, C. Wirth, P. Linke , W.A. Brand, I. Kuhlmann, V. Horna, E.-D. Schulze, Laser Ablation Combustion GC-IRMS - A new method for online analysis of intra-annual variation of δ13C in tree rings, Tree Physiol. 24 (2004) 1193-1201

2002 - 2003

  1. Haiping Qi, Tyler B. Coplen, Heike Geilmann, Willi A. Brand, and J.K. Böhlke, Two new organic reference materials for δ13C and δ15N measurements and a new value for the δ13C of NBS 22 oil, Rapid Comm. Mass Spectrom. 17 (2003) 2483-2487
  2. Prosenjit Ghosh and Willi A. Brand, Stable Isotope Ratio Mass Spectrometry in Climate Research, Int. J. Mass Spectrom. 228 (2003) 1-33
  3. I. Levin, C.Facklam, M. Schmidt, M. Ramonet, P. Ciais, R. Langenfelds, C. Allison, R. Francey, A. Jordan, M. Rothe, W. A. Brand, R.E.M. Neubert and H.A.J. Meijer, TACOS Sausage Flask Intercomparison Report 2002, 1st annual report of the TACOS project 2003
  4. P.D. Brooks, H. Geilmann and R. A. Werner, and W. A. Brand, Improved precision of coupled δ13C and δ15N measurements from single samples using an EA-IRMS (elemental analyzer - isotope ratio mass spectrometer) combination with a post-column 6-port valve and selective CO2 trapping; Improved halide robustness of the combustion reactor using CeO2., Rapid Comm. Mass Spectrom. 17 (2003) 1924-1926
  5. M. Dörr, J. Käßbohrer, R. Grunert, G. Kreisel, W.A. Brand, R.A. Werner, H. Geilmann, C. Apfel, C. Robl, and W. Weigand, 'A possible Prebiotic Formation of Ammonia from Dinitrogen on Iron Sulfide Surfaces', Angew. Chemie 42 (2003) 1540-1543
  6. Thomas Röckmann, Jan Kaiser, Carl A.M. Brenninkmeijer and Willi A. Brand, ' Gas-chromotography, isotope-ratio mass spectrometry method for high-precision position-dependent δ15N and δ18O measurements of nitrous oxide', Rapid Comm. Mass Spectrom. 17 (2003) 1897-1908
  7. R. Michael Verkouteren, Sergey Assonov, Donna B. Klinedinst, and Willi A. Brand, Isotopic metrology of carbon dioxide (II): Effects of ion source materials, conductance, emission, and accelerating voltage on dual-inlet cross contamination, Rapid Comm. Mass Spectrom. 17 (2003) 777-782
  8. Armin Jordan and Willi A. Brand, Technical Report: MPI-BGC, Germany, Proceedings of the 11th IAEA/WMO meeting of CO2 experts, Tokyo, Sept. 2001, WMO-GAW Report 148, ed. S. Toru, (2003) 149-153 more
  9. I. Levin, U. Langendörfer, M. Schmidt, C. Facklam, R. Langenfelds, C. Allison, R. Francey, Jordan, W. A. Brand, R.E.M. Neubert, H.A.J. Meijer, K. Holmén, EuroSiberian Carbonflux: Technical Report CO2 intercomparison, Proceedings of the 11th IAEA/WMO meeting of CO2 experts, Tokyo, Sept. 2001, WMO-GAW Report 148, ed. S. Toru, (2003) 37-54 more
  10. M. Schmidt, P. Ciais, I. Levin, H. Meijer, R. Neubert, M. Ramonet, W.A. Brand and R. Francey, The European Intercomparison Project for Greenhouse Gas Monitoring (TACOS-Infrastructure), Proceedings of the 11th IAEA/WMO meeting of CO2 experts, Tokyo, Sept. 2001, WMO-GAW Report 148, ed. S. Toru, (2003) 32- 36 more
  11. Jon Lloyd, Colin A. Allison, Ray Langenfelds, Roger J. Francey, Manuel Gloor, Daniil Zolotukhine, Nadja Tchebakova , Willi A. Brand, Roland A. Werner, Armin Jordan , Olga Shibistova and E.-D. Schulze, A First Trace Gas Climatology above Zotino, Central Siberia, Tellus 54 (2002) 749
  12. Julie M. Styles, Michael R. Raupach, Graham D. Farquar, Ofal E.E. Kolle, Kieran A. Lawton, Willi A. Brand, Roland A. Werner, Armin Jordan, E.-Detlef Schulze, Olga Shibistova and Jon Lloyd, Soil and canopy CO2, 13CO2, H2O and sensible heat flux partitions in a forest canopy inferred from concentration measurements, Tellus 54 (2002) 655

1999 - 2001

  1. Roland A. Werner, Michael Rothe and Willi A. Brand, Extraction of CO2 from air samples for isotopic analysis and limits to ultra high precision δ18O determination in CO2 gas , Rapid Comm. Mass Spectrom. 15 (2001) 2152-2167
  2. Röckmann, T., J. Kaiser, C.A.M. Brenninkmeijer, W.A. Brand, R. Borchers, J.N. Crowley, M. Wollenhaupt and P.J. Crutzen, The position dependent 15N enrichment of nitrous oxide in the stratosphere, Isot. Environ. Health Stud. (2001), 37 (2001) 91-95
  3. Roland A. Werner and Willi A. Brand, Referencing Strategies and Techniques in Stable Isotope Ratio Analysis, Rapid Comm. Mass Spectrom. 15 (2001) 501-519
  4. W. A. Brand and T. B. Coplen, An interlaboratory study for testing instrument performance of hydrogen dual-inlet isotope-ratio mass spectrometers, Fresenius Z. Anal. Chem. 370 (2001) 358
  5. Röckmann, T., J. Kaiser, C.A.M. Brenninkmeijer, J.N. Crowley, R. Borchers, W. A. Brand, and P.J. Crutzen, The isotopic enrichment of nitrous oxide (15N14NO, 14N15NO, 14N14N18O) in the stratosphere and in the laboratory, J. Geophys. Res. 106(D10), 10403 (2001)
  6. M.E. Wieser and W. A. Brand, 'Isotope Ratio Studies using Mass Spectrometry' in 'Encyclopedia of Spectroscopy and Spectrometry',ed. J.C. Lindon, G.E. Tranter and J.L. Holmes, Academic Press, ISBN 0-12-226680-3, (1999), 1072-1086
  7. M.E. Wieser and W. A. Brand, A Laser Extraction / Combustion Technique for in Situ δ13C Analysis of Organic and Inorganic materials, Rapid Comm. Mass Spectrom. 13 (1999) 1218
  8. R.A. Werner, B.A. Bruch and W. A. Brand, ConFlo III - An Interface for High Precision δ13C and δ15N Analysis with an Extended Dynamic Range, Rapid Comm. Mass Spectrom. 13 (1999) 1237
  9. A.W. Hilkert, C.B. Douthitt, H.J. Schlueter and W. A. Brand, 'Isotope Ratio Monitoring GCMS of D/H by High Temperature Conversion Isotope Ratio Mass Spectrometry', Rapid Comm. Mass Spectrom 13 (1999) 1226

1996 - 1998

  1. W. A. Brand, 'Isotope Mass Spectrometry: Precision from Transient Signals', in Adv. Mass Spectrom. , Volume 14, eds. E.J. Karjalainen, A.E. Hesso, J.E. Jalonen and U.P. Karjalainen, Elsevier, Amsterdam (1998), 661-686
  2. Hener U, Brand W. A., Hilkert AW, Juchelka D, Mosandl A, Podebrad F., Simultaneous on-line analysis of O-18/O-16 and C-13/C-12 ratios of organic compounds using GC-pyrolysis-IRMS, Z. Lebensm. Unters. F A 206: (3) 230-232 1998
  3. Thielecke F, Brand W., Noack R., Hydrogen Isotope Determination For Small-Size Water Samples Using An Equilibration Technique, J. Mass Spectrom. 33: (4) 342-345 APR 1998
  4. Pel R, Oldenhuis R, Brand W., Vos A, Gottschal JC, Zwart KB, Stable-isotope analysis of a combined nitrification-denitrification sustained by thermophilic methanotrophs under low-oxygen conditions, App. Environ. Microb. 63: (2) 474-481 Feb 1997
  5. Fry B, Garritt R, Tholke K, Brand W., Mersch FJ., Cryoflow: Cryofocusing nanomole amounts of CO2, N2, and SO2 from an elemental analyzer for stable isotopic analysis, Rapid Comm. Mass Spectrom. 10: (8) 953-958 1996
  6. Hofmann D, Brand W.A., Microcombustion of ng amounts of carbon in non-volatile materials for isotope ratio evaluation, Isot. Environ. Health Stud. 32, 255-262 (1996)
  7. Brand W.A., Avak H, Seedorf R, Hofmann D, Conradi T, New methods for fully automated isotope ratio determination from hydrogen at the natural abundance level, Isot. Environ. Healt Stud. 32, 263-273 (1996)
  8. Brand W.A., Dobberstein P., Isotope-ratio-monitoring liquid chromatography mass spectrometry (IRM-LCMS): First results from a moving wire interface system, Iso. Environ. Health Stud. 32, 275-283 (1996)
  9. Brand W.A., High Precision Isotope Ratio Monitoring Techniques in Mass Spectrometry, J. Mass Spectrom. 31: (3) 225-235 Mar 1996

1988 - 1995

  1. Brand W. A., PreCon: A fully automated interface for the pre-GC concentration of trace gases in air for isotopic analysis. Isotopes Environ. Health Stud. 31, 277-284 (1995)
  2. Giesemann A, Jager HJ, Norman AL, Krouse HR, Brand W.A., Online Sulfur-Isotope Determination using an Elemental Analyzer Coupled to a Mass-Spectrometer, Anal Chem 66: (18) 2816-2819 Sep 15 1994
  3. Merritt D.A., Brand W.A., Hayes J.M., Isotope-Ratio-Monitoring Gas-Chromatography Mass-Spectrometry - Methods for Isotopic Calibration, Org Geochem 21: (6-7) 573-583 Jun-Jul 1994
  4. Brand W.A., Tegtmeyer AR, Hilkert A., Compound-Specific Isotope Analysis - Extending toward N-15/N-14 and O-18/O-16, Org Geochem 21: (6-7) 585-594 Jun-Jul 1994
  5. Meier Augenstein W, Brand W., Hoffmann GF, Rating D, Bridging The Information Gap Between Isotope Ratio Mass-Spectrometry And Conventional Mass-Spectrometry, Biol Mass Spectrom 23: (6) 376-378 Jun 1994
  6. Brand W.A., Tegtmeyer A.R., and A. Hilkert, 1994, Compound- specific isotope analysis: extending toward 15N/14N and 18O/16O. Organic Geochemistry, 21, 585-594.
  7. Fry B, Brand W, Mersch FJ, Tholke K, Garritt R, Automated-Analysis System For Coupled Delta-C-13 And Delta-N-15 Measurements, Anal Chem 64: (3) 288-291 Feb 1 1992
  8. Rautenschlein M., Habfast K., and W. Brand, 1990, High precision measurement of 13C/12C by on-line combustion of GC eluates and isotope ratio mass spectrometry, pp. 133-148 in Stable Isotopes in Paediatric,Nutritional and Metabolic Research (eds. T.E. Chapman, R. Berger, D.J. Reyngoud), A. Okken, Intercept, Groningen.
  9. Oesselmann J, Brand W, Trapping Box Dedicated For The 15N/14N and 13C/12C Isotope Ratio Determination In Medical-Research, Food Science, Agriculture And Environmental-Research Appl Radiat Isotopes 39: (6) 603-603 1988
  10. Brand W.A., Habfast K., and M. Ricci, 1989, On-line combustion and high precision isotope ratio monitoring of organic compounds, Adv. Mass Spectrom. 11B, ed. P. Longevialle, Heyden and Son, London, p. 1800.
  11. Hayes J.M., Freeman K.H., Ricci M.P., Studley S.A., Schoell M., Moldowan J.M., Carlson R., Gallegos E., Habfast K., and W. Brand, 1989, A new approach to isotope-ratio-monitoring gas chromatography mass spectrometry, Advances in Mass Spectrometry 11B., ed. P. Longevialle, Heyden and Son, London, p. 1108.

1980 - 1984

  1. Brand W. A., Baer T., Dissociation Dynamics of Energy-Selected C5H10+ Ions J Am Chem Soc 106: (11) 3154-3160 1984
  2. Brand W. A., Stocklov J, Walther HJ., Conversion of Field-Ionization Kinetics Data to Unimolecular Rate-Constant Functions - a Simple Numerical Approach, Int J Mass Spectrom 59: (1) 1-20 1984
  3. Baer T, Brand W. A., Bunn TL and Butler JJ., Isomerization of Internal-Energy-Selected Ions Faraday Discuss (75) 45-55 1983
  4. Bramer EM, Weger E, Ischtwan J, Brand W, Levsen K., Photodissociation of some Small Heteroatom-Containing Organic Ions, Int J Mass Spectrom 55: (1) 83-91 1983
  5. Weger E, Brand W. A., Levsen K., Photo-Dissociation of Gaseous [C4H5N]+ Ions, Org Mass Spectrom 18: (12) 534-537 1983
  6. Brand W. A., Levsen K., Approximate Determination of Absolute Unimolecular Rate Constants using the Field-Ionization Kinetic Method, Int J Mass Spectrom 51: (2-3) 135-154 1983
  7. Brand W. A., Baer T., Unimolecular Dissociation of Energy-Selected T-Butylbenzene Ions and Effect of Thermal Energy on Data-Analysis, Int J Mass Spectrom 49: (2) 103-112 1983
  8. Brand W. A., Baer T, Klots CE., Kinetic-Energy Release Distribution in the Fragmentation of Energy-Selected Iodopropane Ions, Chem Phys 76: (1) 111-120 1983
  9. Brand W., Beckey HD, Fassbender B, et al., The Temperature-Dependence of Unimolecular Decomposition Processes following Field-Ionization, Int J Mass Spectrom 35: (1-2) 11-22 1980
  10. Brand W., Levsen K., Thermal-Energy Distribution and Energy Deposition during Field-Ionization Int J Mass Spectrom 35: (1-2) 1-9 1980

Patents:

  1. DE 43 33 208 C2, filed 29.9. 93, granted 6.4.95 W. Brand and K. Habfast 'Verfahren zur massenspektrometrischen Untersuchung gasfoermiger Komponenten'
  2. US 5 424 539, filed Dec. 14, 1993, granted Jun. 13, 1995 W. Brand and K. Habfast ' Process for the analysis of gaseous components by mass spectrometry'
  3. US 5 432 344, filed Aug. 31, 1993, granted Jul. 11, 1995 W. Brand 'Appliance for the oxidation of components in organic samples, and process therefor'
  4. GB 2 273 561 B, filed 2. 12. 93, granted 30. 10. 96 W. Brand and K. Habfast, 'Process for the analysis of gaseous components by mass spectrometry'
  5. GB 2 270 977 B, filed 31. 8. 93, granted 12. 6. 96 W. Brand 'Combustion oven for the oxidation of components in organic samples, and process therefor'
  6. DE 4421 272 A1, filed 21. 6. 94 W. Brand 'Doppeleinlasssystem fuer die Messung der Isotopenzusammensetzung gasfoermiger Substanzen sowie Verfahren zum Betreiben eines solchen Systems'
  7. DE 43 32 127 A1, filed 22. 9. 93 W. Brand 'Einrichtung zur Oxidation von Komponenten organischer Proben sowie Verfahren hierzu'