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The optimum volume for a flow-through gas cell used in the gas chromatography-infrared spectroscopy interface (GC-ir) is shown to be equal to the volume of carrier gas between the half-width points of the GC peak. The optimum length and diameter for lightpipe gas cells for GC fractions
separated using ⅛ in. packed columns and support-coated open tubular columns has been calculated for infrared measurements made using a rapid-scanning Fourier transform infrared spectrometer with either a triglycine sulfate or a mercury cadmium telluride detector. A sampling trigger
actuated by the inflection points of the GC peak has been shown to be superior to the more usual threshold type of trigger. Expressions for the delay time between actuation of the trigger and initiation of data collection are also derived.
Department of Chemistry, Ohio University, Athens, Ohio 45701
Publication date: July 1, 1977
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The Society publishes the internationally recognized, peer reviewed journal, Applied Spectroscopy, which is available both in print and online. Subscriptions are included with membership or can be purchased by institutional or corporate organizations. Abstracts may be viewed free of charge. Previously published as Bulletin (Society for Applied Spectroscopy)