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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. doi:10.1103/PhysRevA.39.4312.

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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.

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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).
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Deposited On:13 Dec 2006
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