Polarization effects in low-energy e-CH/sub 4/ collisions

Journal Article · Sat Apr 15 04:00:00 EDT 1989 · Phys. Rev. A; (United States)

DOI:https://doi.org/10.1103/PhysRevA.39.4312· OSTI ID:6315075

Lima, M A.P.; Watari, K; McKoy, V

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 CH/sub 4/ 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.

• Research Organization: A. A. Noyes Laboratory of Chemical Physics, California Institute of Technology, Pasadena, California 91125
• OSTI ID: 6315075
• Journal Information: Phys. Rev. A; (United States), Journal Name: Phys. Rev. A; (United States) Vol. 39:8; ISSN PLRAA
• Country of Publication: United States
• Language: English

Related Subjects

640304* -- Atomic
Molecular & Chemical Physics-- Collision Phenomena
74 ATOMIC AND MOLECULAR PHYSICS
ALKANES
COLLISIONS
CROSS SECTIONS
DIFFERENTIAL CROSS SECTIONS
ELASTIC SCATTERING
ELECTRON COLLISIONS
ELECTRON-MOLECULE COLLISIONS
ENERGY RANGE
EV RANGE
EV RANGE 01-10
HYDROCARBONS
METHANE
MOLECULE COLLISIONS
ORGANIC COMPOUNDS
POLARIZATION
POTENTIALS
RAMSAUER EFFECT
SCATTERING