1. A new organic reference material, l‐glutamic acid, USGS41a, for δ13C and δ15N measurements − a replacement for USGS41. (1st March 2016) Authors: Qi, Haiping; Coplen, Tyler B.; Mroczkowski, Stanley J.; Brand, Willi A.; Brandes, Lauren; Geilmann, Heike; Schimmelmann, Arndt Journal: Rapid communications in mass spectrometry Issue: Volume 30:Number 7(2016) Page Start: 859 Record Type: Journal Article View Content: Available online (eLD content is only available in our Reading Rooms) ↗
2. A robust method for direct calibration of isotope ratios in gases against liquid/solid reference materials, including a laboratory comparison for δ13C‐CH4. (20th November 2020) Authors: Sperlich, Peter; Moossen, Heiko; Geilmann, Heike; Bury, Sarah J.; Brown, Julie C.S.; Moss, Rowena C.; Brailsford, Gordon W.; Brand, Willi A. Journal: Rapid communications in mass spectrometry Issue: Volume 35:Number 1(2021) Page Start: n/a Record Type: Journal Article View Content: Available online (eLD content is only available in our Reading Rooms) ↗
3. Changes of 2H and 18O abundances in water treated with non‐thermal atmospheric pressure plasma jet. Issue 10 (5th April 2017) Authors: Mance, Diana; Geilmann, Heike; Brand, Willi A.; Kewitz, Thorben; Kersten, Holger Journal: Plasma processes and polymers Issue: Volume 14:Issue 10(2017) Page Start: n/a Record Type: Journal Article View Content: Available online (eLD content is only available in our Reading Rooms) ↗
4. Fingerprinting environmental conditions and related stress using stable isotopic composition of rice (Oryza sativa L.) grain organic matter. (February 2016) Authors: Kaushal, Ritika; Ghosh, Prosenjit; Geilmann, Heike Journal: Ecological indicators Issue: Volume 61:Part 2(2016) Page Start: 941 Record Type: Journal Article View Content: Available online (eLD content is only available in our Reading Rooms) ↗
5. Isotopic disproportionation during hydrogen isotopic analysis of nitrogen‐bearing organic compounds. (26th March 2015) Authors: Nair, Sreejesh; Geilmann, Heike; Coplen, Tyler B.; Qi, Haiping; Gehre, Matthias; Schimmelmann, Arndt; Brand, Willi A. Journal: Rapid communications in mass spectrometry Issue: Volume 29:Number 9(2015) Page Start: 878 Record Type: Journal Article View Content: Available online (eLD content is only available in our Reading Rooms) ↗
6. Isotopically characterised N2O reference materials for use as community standards. (28th April 2022) Authors: Mohn, Joachim; Biasi, Christina; Bodé, Samuel; Boeckx, Pascal; Brewer, Paul J.; Eggleston, Sarah; Geilmann, Heike; Guillevic, Myriam; Kaiser, Jan; Kantnerová, Kristýna; Moossen, Heiko; Müller, Joanna; Nakagawa, Mayuko; Pearce, Ruth; von Rein, Isabell; Steger, David; Toyoda, Sakae; Wanek, Wolfgang... Journal: Rapid communications in mass spectrometry Issue: Volume 36:Number 13(2022) Page Start: n/a Record Type: Journal Article View Content: Available online (eLD content is only available in our Reading Rooms) ↗
7. Methyl sulfates as methoxy isotopic reference materials for δ13C and δ2H measurements. (29th January 2019) Authors: Greule, Markus; Moossen, Heiko; Geilmann, Heike; Brand, Willi A.; Keppler, Frank Journal: Rapid communications in mass spectrometry Issue: Volume 33:Number 4(2019) Page Start: 343 Record Type: Journal Article View Content: Available online (eLD content is only available in our Reading Rooms) ↗
8. 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). (9th February 2017) Authors: Gehre, Matthias; Renpenning, Julian; Geilmann, Heike; Qi, Haiping; Coplen, Tyler B.; Kümmel, Steffen; Ivdra, Natalija; Brand, Willi A.; Schimmelmann, Arndt Journal: Rapid communications in mass spectrometry Issue: Volume 31:Number 6(2017) Page Start: 475 Record Type: Journal Article View Content: Available online (eLD content is only available in our Reading Rooms) ↗
9. Reassessment of the NH4NO3 thermal decomposition technique for calibration of the N2O isotopic composition. (20th October 2016) Authors: Mohn, Joachim; Gutjahr, Wilhelm; Toyoda, Sakae; Harris, Eliza; Ibraim, Erkan; Geilmann, Heike; Schleppi, Patrick; Kuhn, Thomas; Lehmann, Moritz F.; Decock, Charlotte; Werner, Roland A.; Yoshida, Naohiro; Brand, Willi A. Journal: Rapid communications in mass spectrometry Issue: Volume 30:Number 23(2016) Page Start: 2487 Record Type: Journal Article View Content: Available online (eLD content is only available in our Reading Rooms) ↗
10. USGS44, a new high‐purity calcium carbonate reference material for δ13C measurements. (7th January 2021) Authors: Qi, Haiping; Moossen, Heiko; Meijer, Harro A.J.; Coplen, Tyler B.; Aerts‐Bijma, Anita T.; Reid, Lauren; Geilmann, Heike; Richter, Jürgen; Rothe, Michael; Brand, Willi A.; Toman, Blaza; Benefield, Jacqueline; Hélie, Jean‐François Journal: Rapid communications in mass spectrometry Issue: Volume 35:Number 4(2021) Page Start: n/a Record Type: Journal Article View Content: Available online (eLD content is only available in our Reading Rooms) ↗