Characterization of a focal plane camera fitted to a Mattauch-Herzog geometry mass spectrograph. 1. Use with a glow-discharge source

James H. Barnes IV, Roger Sperline, M Bonner Denton, Charles J. Barinaga, David Koppenaal, Erick T. Young, Gary M. Hieftje

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A Mattauch-Herzog geometry mass spectrograph (MHMS) has been equipped with a novel array detector, the focal plane camera (FPC). The FPC consists of an array of gold Faraday cups, each coupled to its own integrator, with interrogation of the integrators performed by a multiplexer. The initial coupling of this instrument with a pintype glow discharge source has provided limits of detection in the single to hundreds of nanograms per gram regime; isotope ratio accuracy and precision better than 5% error and 0.2% RSD, respectively; and a linear dynamic range of at least 6 orders of magnitude. A current weakness of the FPC is its pixel size, which limits both sensitivity and baseline resolution (to R = 130). The minimum data acquisition time for multiple images at present is 1 ms/image, with a dead time of 3.2 ms between images, which will limit the ability of the FPC to monitor extremely short transient signals.

Original languageEnglish (US)
Pages (from-to)5327-5332
Number of pages6
JournalAnalytical Chemistry
Issue number20
Publication statusPublished - Oct 15 2002


ASJC Scopus subject areas

  • Analytical Chemistry

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