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Charge-mode electrometer measurements of S-isotopic compositions on SHRIMP-SI

Ireland, T.R.; Schram, N.; Holden, P.; Lanc, P.; Ávila, J.; Armstrong, R.; Amelin, Y.; Latimore, A.; Corrigan, D.; Clement, S.; Foster, J.J.; Compston, W.


Measurement of ion currents is fundamental to isotope ratio measurements. For small signals, discrete ion arrivals can be detected in pulse counting systems. This procedure works well until a few hundred thousand counts per second when dead time and gain drift become significant. Where sufficiently high signal is available, ion currents can be measured directly in Faraday cups coupled to electrometers with high ohmic (1011, 1012 ) resistors. However, electrometers measuring current are...[Show more]

CollectionsANU Research Publications
Date published: 2014-02-01
Type: Journal article
Source: International Journal of Mass Spectrometry
DOI: 10.1016/j.ijms.2013.12.020
Access Rights: Open Access


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