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Electron impact excitation of H2O

Trajmar, S. and Williams, W. and Kuppermann, A. (1973) Electron impact excitation of H2O. Journal of Chemical Physics, 58 (6). pp. 2521-2531. ISSN 0021-9606. doi:10.1063/1.1679534.

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Relative differential cross sections for elastic scattering and for a number of inelastic processes corresponding to vibrational and vibronic excitation of H2O have been determined at 53, 20, and 15 eV impact energies in the 0°–90° angular range. The measurements were carried out with an instrumental resolution of about 80 meV for transitions corresponding to the following energy losses: 0.45 eV(nu1 and/or nu3); 0.90 eV (nu1+nu3); 4.5 eV [tripletstate(s)]; 7.4 eV (Ã1B1); 9.7 eV (B-tilde1A1); 9.81 eV (tripletstate); 10.00 eV [C-tilde1B1 (0,0,0)]; 10.17 eV [D-tilde1A1 (0,0,0)]; 10.38 eV [C-tilde1B1 (1,0,0)]; 10.57 eV [D-tilde1A1 (1,0,0)]; 10.76 eV [C-tilde1B1 (2,0,0)] and [D-tilde1A1 (1,1,0)]; 11.01 eV (E-tilde1B1); and 11.11 eV (F-tilde). On the basis of the angular distribution of the scattered electrons, it is suggested that the 4.5 and 9.81 eV transitions are associated with excitations of triplet states, while the angular distribution of the scattered electrons at all other energy losses indicate predominantly singlet-singlet transitions. The sharpness of the 9.81 eV transition indicates that the corresponding state has an equilibrium geometry similar to that of the ground state.

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Additional Information:©1973 The American Institute of Physics. Received 8 August 1972. 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. 4524. Work supported in part by the U.S. Atomic Energy Commission, Rept. Code No. CALT-767P4-89.
Issue or Number:6
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:10522
Deposited By: Archive Administrator
Deposited On:13 May 2008
Last Modified:08 Nov 2021 21:08

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