USE OF AN ExB WIEN VELOCITY FILTER FOR THE DETECTION OF PHOTOFRAGMENTS
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Date
1992
Journal Title
Journal ISSN
Volume Title
Publisher
Ohio State University
Abstract
A very simple ion beam system will be discussed which features coaxial overlap of a cw, high resolution laser beam with a continuous, high current molecular ion beam. Photofragments can be detected mass specifically - both with regard to the fragment and parent mass - using a new adaptation of the ExB. When velocity filter. The technique works by applying a voltage to a drift region tube in which the laser and ion beam interact which is different than that to which a Wien filter is referenced. The drift region voltage can be tuned to obtain photofragments at predeterminable positions at higher or lower mass than that of the parent in the mass spectrum. It is hoped that the combination of coaxially overlapped high continuous ion currents ($\sim 10^{12}S^{-1}$) with very low backgrounds (obtained by tuning the fragments far away from parent peaks) will result in good sensitivity. Initial experimental results will be discussed.
Description
Author Institution: Department of Chemistry, The Ohio State University, Laser Spectroscopy Facility