Studies of electron-molecule collisions: Applications to e-italic-H/sub 2/O

Journal Article · Fri Aug 15 04:00:00 EDT 1986 · J. Chem. Phys.; (United States)

OSTI ID:5571612

Brescansin, L M; Lima, M A.P.; Gibson, T L; McKoy, V; Huo, W M

We report elastic differential and momentum transfer cross sections for the elastic scattering of electrons by H/sub 2/O 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/sup 0/. The implication of this feature for the determination of momentum transfer cross sections is described.

• Research Organization: Arthur Amos Noyes Laboratory of Chemical Physics, California Institute of Technology, Pasadena, California 91125
• OSTI ID: 5571612
• Journal Information: J. Chem. Phys.; (United States), Journal Name: J. Chem. Phys.; (United States) Vol. 85:4; 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 01-10
FLUIDS
GASES
MOLECULE COLLISIONS
MOMENTUM TRANSFER
SCATTERING
VAPORS
WATER VAPOR