SUB-DOPPLER DIRECT ABSORPTION IR LASER SPECTROSCOPY IN FAST *** BEAMS
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Date
1988
Journal Title
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Volume Title
Publisher
Ohio State University
Abstract
We have recently succeeded in detecting, for the first Lime, direct absorption of radiation by ions in an ion beam. Direct absorption IR spectroscopy in Ion beams offers a number of attractive features: 1) the absolute number density of an Ion can be determined from a conventional mass spectrum and a measurement of the total ion current; 2) from the observation of a single line, the charge-to-mass ratio of the absorbing species may be determined; 3) very high resolution, ca. 30 MHz, is attained due to ``acceleration cooling''; 4) the method is not limited to systems which exhibit a process secondary to absorption; 5) a variety of ion sources are available which produce clusters, open-shell species, nonclassical ions, and other species of chemical interest; and 6) supersonic sources can produce very cold ions. It has generally been thought that densities in ion beams were prohibitively low for the detection of direct absorption; an apparatus which surmounts this difficulty will be described. Preliminary experiments on $HN_{2}$ and $H_{3}O$ will be discussed.
Description
Author Institution: Department of Chemistry, University of California