Brescansin, Luiz M. and Lima, Marco A. P. and Gibson, Thomas L. and McKoy, Vincent and Huo, Winifred M. (1986) Studies of electron-molecule collisions: Applications to e-H2O. Journal of Chemical Physics, 85 (4). pp. 1854-1858. ISSN 0021-9606. http://resolver.caltech.edu/CaltechAUTHORS:BREjcp86
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We report elastic differential and momentum transfer cross sections for the elastic scattering of electrons by H2O for collision energies from 2 to 20 eV. These fixed-nuclei static-exchange cross sections were obtained using the Schwinger variational approach. In these studies the exchange potential is directly evaluated and not approximated by local models. The calculated differential cross sections, obtained with a basis set expansion of the scattering wave function, agree well with available experimental data at intermediate and larger angles. As used here, the results cannot adequately describe the divergent cross sections at small angles. An interesting feature of the calculated cross sections, particularly at 15 and 20 eV, is their significant backward peaking. This peaking occurs in the experimentally inaccessible region beyond a scattering angle of 120°. The implication of this feature for the determination of momentum transfer cross sections is described.
|Additional Information:||© 1986 American Institute of Physics. Received 18 March 1986; accepted 29 April 1986. This material is based upon research supported by the National Science Foundation under Grant No. PHY-8212992 and by the NASA-Ames Cooperative Agreement No. NCC2-319. One of us (M.A.P.L.) acknowledges financial support from the Comissão Nacional de Energia Nuclear (CNEN), Rio de Janeiro, Brasil. L.M.B. acknowledges a fellowship from Conselho Nacional de Desenvolvimento Cientifico e Technológico (CNPq), Brasil. Two of us (M.A.P.L. and L.M.B.) acknowledge financial support from the Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP), Brasil. The research of W.M.H. is supported by the National Aeronautics and Space Administration NASA-AMES Cooperative Agreement No. NCC2-147. Arthur Amos Noyes Laboratory of Chemical Physics, Contribution No. 7381.|
|Subject Keywords:||ELECTRON−MOLECULE COLLISIONS, WATER VAPOR, ELASTIC SCATTERING, MOMENTUM TRANSFER, DIFFERENTIAL CROSS SECTIONS|
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|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Tony Diaz|
|Deposited On:||26 Aug 2008 23:30|
|Last Modified:||26 Dec 2012 10:14|
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