Electronic excitation of H sub 2 by electron impact: Close-coupling calculations using the complex Kohn variational method

Journal Article · Mon Apr 01 00:00:00 EST 1991 · Physical Review, A; (USA)

DOI:https://doi.org/10.1103/PhysRevA.43.3514· OSTI ID:5523147

Parker, S D; McCurdy, C W ^[1]; Rescigno, T N; Lengsfield, III, B H ^[2]

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1. Department of Chemistry, Ohio State University, Columbus, Ohio 43210 (US)
2. Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94550 (US)

The complex Kohn variational method is employed in four-state close-coupling calculations to generate integral and differential cross sections for low-energy electron-impact excitation of the {sup 1}{Sigma}{sub g}{sup +}{r arrow}(b {sup 3}{Sigma}{sub u}{sup +}, {sup 3}{Sigma}{sub g}{sup +}, and {ital c} {sup 3}{Pi}{sub {ital u}}) transitions in H{sub 2}. The integral cross sections for excitation of the {sup 3}{Sigma}{sub g}{sup +} and {ital c} {sup 3}{Pi}{sub {ital u}} states from the ground state are found to be significantly different from earlier two-state calculations. The {ital a} {sup 3}{Sigma}{sub {ital g}}{sup +} cross sections are also larger than the most recent experimental results. This discrepancy is traced to the behavior of the differential cross sections at scattering angles near 0{degree} and 180{degree}, where measurements have not been carried out. The differential cross sections we find for H{sub 2} are strikingly similar to cross sections for analogous transitions in He. Previous theoretical studies of these transitions in He have also shown the two-state approximation to be inadequate.

• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 5523147
• Journal Information: Physical Review, A; (USA), Vol. 43:7; ISSN 1050-2947
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
HYDROGEN
ELECTRON-MOLECULE COLLISIONS
DIFFERENTIAL CROSS SECTIONS
EXCITATION
SMALL ANGLE SCATTERING
VARIATIONAL METHODS
COLLISIONS
CROSS SECTIONS
ELECTRON COLLISIONS
ELEMENTS
ENERGY-LEVEL TRANSITIONS
MOLECULE COLLISIONS
NONMETALS
SCATTERING
640304* - Atomic
Molecular & Chemical Physics- Collision Phenomena