A new gas inlet system for an isotope ratio mass spectrometer improves reproducibility

Leuenberger, M.; Nyfeler, P.; Moret, H. P.; Sturm, P.; Huber, Ch. (2000). A new gas inlet system for an isotope ratio mass spectrometer improves reproducibility. Rapid communications in mass spectrometry, 14(16), pp. 1543-1551. Wiley 10.1002/1097-0231(20000830)14:16%3C1543::AID-RCM62%3E3.0.CO;2-H

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We have developed a new inlet system for a gas sample isotope ratio mass spectrometer (IRMS). It is based on the well-known open split design from the gas chromatography/mass spectrometry (GC/MS) system due to its simplicity. The advantages over the conventional double inlet system with the metal bellows design include an improved reproducibility mainly due to a highly controllable pressure and temperature adjustment, a markedly lowered memory effect due to an uninterrupted gas flow through the ion source which limits adsorption/desorption processes on surfaces, and a single inlet capillary circumventing problems of asymmetrical behavior of sample and reference inlet paths. Furthermore, sample consumption is of the same order as for conventional measurements (i.e. about 0.4 mmol per hour), of which however only 2 µmol/h is used for the actual isotope ratio determination since the major gas amount acts as a gas flow seal against the atmosphere, corresponding to a 100–200 fold overkill. This may be improved in future systems.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Physics Institute > Climate and Environmental Physics

UniBE Contributor:

Leuenberger, Markus, Nyfeler, Peter, Moret, Hanspeter

Subjects:

500 Science > 530 Physics

ISSN:

0951-4198

Publisher:

Wiley

Language:

English

Submitter:

BORIS Import 2

Date Deposited:

09 Sep 2021 12:10

Last Modified:

02 Mar 2023 23:35

Publisher DOI:

10.1002/1097-0231(20000830)14:16%3C1543::AID-RCM62%3E3.0.CO;2-H

BORIS DOI:

10.48350/158522

URI:

https://boris.unibe.ch/id/eprint/158522

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