CaltechAUTHORS
  A Caltech Library Service

Polarization effects in low-energy e-CH4 collisions

Lima, M. A. P. and Watari, K. and McKoy, V. (1989) Polarization effects in low-energy e-CH4 collisions. Physical Review A, 39 (8). pp. 4312-4315. ISSN 0556-2791. http://resolver.caltech.edu/CaltechAUTHORS:LIMpra89

[img]
Preview
PDF
See Usage Policy.

600Kb

Use this Persistent URL to link to this item: http://resolver.caltech.edu/CaltechAUTHORS:LIMpra89

Abstract

We have used the Schwinger multichannel formulation [Takatsuka and McKoy, Phys. Rev. A 24, 2473 (1981)] to carry out ab initio studies of the effects of polarization on the cross sections for elastic scattering of electrons by the polyatomic molecule CH4 for collision energies from 7.5 down to 0.02 eV. Although the closed-channel expansion through which polarization effects are included in this approach is not fully converged, the resulting cross sections do show a Ramsauer-Townsend minimum between 0.1 and 0.2 eV, about 0.3 eV below where it is seen experimentally. Our static-exchange cross sections show no Ramsauer-Townsend minimum. At the higher energy of 7.5 eV, where polarization effects are less significant, the calculated differential cross sections are in excellent agreement with the measured values. Differential cross sections are also shown at 3.0 eV.


Item Type:Article
Additional Information:©1989 The American Physical Society Received 24 January 1989 This work was supported by National Science Foundation Grant No. PHY-8604242, the Innovative Science and Technology Program of the Strategic Defense Initiative Office under Contract Np. DAAL03-86-K-0140 of the Army Research Office, and NASA-Ames Cooperative Agreement NCC 2-319. We also acknowledge use of computer resources of the NASA-Ames Research Center. M.A.P.L. and K.W. acknowledge support from Conselho Nacional de Desenvolvimento Científico e Tecnológico (Brazil).
Record Number:CaltechAUTHORS:LIMpra89
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:LIMpra89
Alternative URL:http://dx.doi.org/10.1103/PhysRevA.39.4312
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:6576
Collection:CaltechAUTHORS
Deposited By: Archive Administrator
Deposited On:13 Dec 2006
Last Modified:26 Dec 2012 09:23

Repository Staff Only: item control page