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Angular Dependence of Electron Impact Excitation Cross Sections of O2

Trajmar, S. and Williams, W. and Kuppermann, A. (1972) Angular Dependence of Electron Impact Excitation Cross Sections of O2. Journal of Chemical Physics, 56 (8). pp. 3759-3765. ISSN 0021-9606. doi:10.1063/1.1677774.

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The electron-impact excitation spectrum of O2 has been studied at 20 and 45 eV impact energies and at scattering angles ranging from 10° to 90°. The angular behavior of the differential scattering cross sections for excitation of the a1Deltag, b1Sigmag+, B3Sigmau– states, for the 9.97 eV ("longest" band), and the 10.29 eV ("second" band) transitions, for the broad feature at 6.1 eV energy-loss (previously assigned to the excitation of the A3Sigmau+ state), and for elastic scattering has been determined. The experimentally measured relative differential and integral cross sections for these processes have been approximately normalized to the absolute scale. The intensities of the different transitions in optical and electron-impact spectra are compared and the importance of spin-orbit coupling and exchange processes are discussed. It is found that the energy-loss feature at 6.1 eV in the electron-impact spectrum is mostly due to the excitation of the c1Sigmau– state. This new assignment is supported by the angular and energy dependence of the scattering cross section (and by the intensity pattern found in various electron impact processes).

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Additional Information:©1972 The American Institute of Physics. Received 19 April 1971. Work supported by the National Aeronautics and Space Administration under Contract No. NAS7-100. A. A. Noyes Laboratory of Chemical Physics, Division of Chemistry and Chemical Engineering. Contribution No. 4224. Work supported in part by the U.S. Atomic Energy Commission, Report Code No. CALT-767P4-83.
Issue or Number:8
Record Number:CaltechAUTHORS:TRAjcp72
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ID Code:10521
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Deposited On:13 May 2008
Last Modified:08 Nov 2021 21:08

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