Spherical-complex-optical-potential (SCOP) model for electron--monosilane (SiH/sub 4/) collisions at 30--400 eV: Total (elastic+absorption), momentum transfer, and differential cross sections

Journal Article · Sun Feb 01 04:00:00 EST 1987 · J. Chem. Phys.; (United States)

OSTI ID:7019831

Jain, A

We report nonempirical quantum mechanical calculations on the total (elastic+absorption), momentum transfer, and differential cross sections for e-SiH/sub 4/ collisions at intermediate and high energies (30--400 eV). A parameter-free and energy-dependent spherical-complex-optical potential (SCOP) is evaluated for the e--SiH/sub 4/ system. The real part of the SCOP consists of three local terms, namely static, exchange, and polarization. The static interaction is generated very accurately from near-Hartree--Fock one-center silane wave functions, while the exchange effects are accounted for in the free-electron-gas-exchange (FEGE) model. The polarization potential is evaluated ab initio in a parameter-free approximation of Jain and Thompson. The imaginary term of the total SCOP represents loss of flux due to inelastic channels via an energy-dependent absorption potential calculated from target electron density and short-range static-exchange force in the quasifree model with Pauli blocking (Staszewska et al.; J. Phys. B 16, L281 (1983)). Two versions of this absorption potential are employed; one with an undistorted density and the other with a polarized density determined approximately from first order target wave functions. The later version is more successful when the final results are compared with experiment. The total SCOP is treated exactly in a partial-wave analysis using the variable-phase approach to yield complex phase shifts. Our final total cross sections compare very well with the only available measurements of Sueoka and Mori.

• Research Organization: Physics Department, Cardwell Hall, Kansas State University, Manhattan, Kansas 66506
• OSTI ID: 7019831
• Journal Information: J. Chem. Phys.; (United States), Journal Name: J. Chem. Phys.; (United States) Vol. 86:3; ISSN JCPSA
• Country of Publication: United States
• Language: English

Related Subjects

640304* -- Atomic
Molecular & Chemical Physics-- Collision Phenomena
74 ATOMIC AND MOLECULAR PHYSICS
COLLISIONS
CROSS SECTIONS
DIFFERENTIAL CROSS SECTIONS
ELASTIC SCATTERING
ELECTRON COLLISIONS
ELECTRON-MOLECULE COLLISIONS
ENERGY RANGE
EV RANGE
EV RANGE 10-100
EV RANGE 100-1000
HYDRIDES
HYDROGEN COMPOUNDS
MOLECULE COLLISIONS
MOMENTUM TRANSFER
ORGANIC COMPOUNDS
ORGANIC SILICON COMPOUNDS
SCATTERING
SILANES
SILICON COMPOUNDS
TOTAL CROSS SECTIONS