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Detection and Identification of Triplet States of H2O by Electron Impact

Trajmar, S. and Williams, W. and Kuppermann, Aron (1971) Detection and Identification of Triplet States of H2O by Electron Impact. Journal of Chemical Physics, 54 (5). pp. 2274-2275. ISSN 0021-9606.

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It has been previously (1-4) that the angular behavior of the differential cross section for exciting molecular electronic states by low-energy electron impact is a useful tool in distinguishing transitions which are optically spin forbidden from those which are spin allowed. We have used this method to investigate water vapor and have detected and identified at least two singlet→triplet transitions. One is a broad feature having a maximum intensity at about 4.5 eV excitation energy and the other has a sharp minimum at 9.81 eV. The first one had been detected previously (5-10) and the triplet state character of the upper state involved has been implied (5). The second one had not previously been detected. We show that the differential cross section for both of these excitation processes have an angular dependence characteristic of singlet→triplet transitions.

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Additional Information:©1971 American Institute of Physics. Received 4 December 1970. A.A. Noyes Laboratory of Chemical Physics, Division of Chemistry and Chemical Engineering. Contribution No. 4167. Work supported in part by the U.S. Atomic Energy Commission, Report Code No. CALT-767P4-72. Work supported by the National Aeronautics and Space Administration under Contract No. NAS-7-100.
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Deposited On:13 May 2008
Last Modified:26 Dec 2012 10:01

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