Publications by authors named "Heike Geilmann"

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How Well Do We Know VPDB-Part 2: Interlaboratory Assessment of Existing δC Reference Materials.
Heiko Moossen, Pharahilda M Steur, Federica Camin, Bor Krajnc, Anett Enke, Heike Geilmann

Rapid Commun Mass Spectrom· February 2026

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In-Line Combustion System for the Measurement of δC-CH in Gas Reference Materials Using Optical Isotope Ratio Spectroscopy.
Aimee Hillier, Eric Mussell-Webber, Emily Hopkinson, Freya Wilson, Christoph Nehrbass-Ahles, Heike Geilmann

Anal Chem· June 2025

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Combined -omics framework reveals how ant symbionts benefit the Neotropical ant-plant at different levels.
Andrea T Müller, Michael Reichelt, Eric G Cosio, Norma Salinas, Alex Nina, Heike Geilmann

iScience· October 2022

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Isotopically characterised N O reference materials for use as community standards.
Joachim Mohn, Christina Biasi, Samuel Bodé, Pascal Boeckx, Paul J Brewer, Heike Geilmann

Rapid Commun Mass Spectrom· July 2022

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USGS44, a new high-purity calcium carbonate reference material for δ C measurements.
Haiping Qi, Heiko Moossen, Harro A J Meijer, Tyler B Coplen, Anita T Aerts-Bijma, Heike Geilmann

Rapid Commun Mass Spectrom· February 2021

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A robust method for direct calibration of isotope ratios in gases against liquid/solid reference materials, including a laboratory comparison for δ C-CH.
Peter Sperlich, Heiko Moossen, Heike Geilmann, Sarah J Bury, Julie C S Brown

Rapid Commun Mass Spectrom· January 2021

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Methyl sulfates as methoxy isotopic reference materials for δ C and δ H measurements.
Markus Greule, Heiko Moossen, Heike Geilmann, Willi A Brand, Frank Keppler

Rapid Commun Mass Spectrom· February 2019

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Optimization of on-line hydrogen stable isotope ratio measurements of halogen- and sulfur-bearing organic compounds using elemental analyzer-chromium/high-temperature conversion isotope ratio mass spectrometry (EA-Cr/HTC-IRMS).
Matthias Gehre, Julian Renpenning, Heike Geilmann, Haiping Qi, Tyler B Coplen

Rapid Commun Mass Spectrom· March 2017

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Reassessment of the NH NO thermal decomposition technique for calibration of the N O isotopic composition.
Joachim Mohn, Wilhelm Gutjahr, Sakae Toyoda, Eliza Harris, Erkan Ibraim, Heike Geilmann

Rapid Commun Mass Spectrom· December 2016

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A new organic reference material, l-glutamic acid, USGS41a, for δ(13) C and δ(15) N measurements - a replacement for USGS41.
Haiping Qi, Tyler B Coplen, Stanley J Mroczkowski, Willi A Brand, Lauren Brandes, Heike Geilmann

Rapid Commun Mass Spectrom· April 2016

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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.
Arndt Schimmelmann, Haiping Qi, Tyler B Coplen, Willi A Brand, Jon Fong, Heike Geilmann

Anal Chem· April 2016

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Isotopic disproportionation during hydrogen isotopic analysis of nitrogen-bearing organic compounds.
Sreejesh Nair, Heike Geilmann, Tyler B Coplen, Haiping Qi, Matthias Gehre

Rapid Commun Mass Spectrom· May 2015

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Novel silver-tubing method for quantitative introduction of water into high-temperature conversion systems for stable hydrogen and oxygen isotopic measurements.
Haiping Qi, Manfred Gröning, Tyler B Coplen, Bryan Buck, Stanley J Mroczkowski, Heike Geilmann

Rapid Commun Mass Spectrom· July 2010

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Cavity ring-down spectroscopy versus high-temperature conversion isotope ratio mass spectrometry; a case study on delta(2)H and delta(18)O of pure water samples and alcohol/water mixtures.
Willi A Brand, Heike Geilmann, Eric R Crosson, Chris W Rella

Rapid Commun Mass Spectrom· June 2009

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Comprehensive inter-laboratory calibration of reference materials for delta18O versus VSMOW using various on-line high-temperature conversion techniques.
Willi A Brand, Tyler B Coplen, Anita T Aerts-Bijma, J K Böhlke, Matthias Gehre, Heike Geilmann

Rapid Commun Mass Spectrom· April 2009

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Kel-F discs improve storage time of canopy air samples in 10-mL vials for CO2-delta13C analysis.
Alexander Knohl, Roland A Werner, Heike Geilmann, Willi A Brand

Rapid Commun Mass Spectrom· August 2004

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Two new organic reference materials for delta13C and delta15N measurements and a new value for the delta13C of NBS 22 oil.
Haiping Qi, Tyler B Coplen, Heike Geilmann, Willi A Brand, J K Böhlke

Rapid Commun Mass Spectrom· January 2004

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A possible prebiotic formation of ammonia from dinitrogen on iron sulfide surfaces.
Mark Dörr, Johannes Kässbohrer, Renate Grunert, Günter Kreisel, Willi A Brand, Heike Geilmann

Angew Chem Int Ed Engl· April 2003

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