Application of the Schwinger multichannel formulation to electron-impact excitation of the b sup 3. Sigma. sup + state of CO

Journal Article · Sun Dec 31 23:00:00 EST 1989 · Physical Review, A (General Physics); (USA)

DOI:https://doi.org/10.1103/PhysRevA.41.186· OSTI ID:7243768

Weatherford, C A ^[1]; Huo, W M ^[2]

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1. Department of Physics and Institute for Molecular Computations, Florida A M University, Tallahassee, Florida 32307 (USA)
2. NASA Ames Research Center, Mail Stop 230-3, Moffett Field, California 94035 (USA)

We report integral and differential cross sections for the electron-impact excitation of the {ital b} {sup 3}{Sigma}{sup +} state of CO using the Schwinger multichannel formulation. The calculations were carried out using a two-state approximation, with the incident electron energies in the range from 10.66 to 20 eV. We find four peaks in the inelastic cross section, centered at approximately 10.87, 11.6, 13.4, and 16.2 eV. The origins of the peak structures are discussed in terms of a partial-wave analysis, and comparison is made with experiment and theory where appropriate. We attribute the two sharp, low-energy (10.87 and 11.6 eV) peaks to the decay of {sup 2}{Sigma}{sup +} core-excited Rydberg resonance states of CO{sup {minus}}. The two higher-energy peaks are broad and less well defined. The 13.4-eV peak is not clearly identifiable as a resonance, whereas the 16.2-eV peak in the inelastic cross section occurs as a result of a {sup 2}{Sigma}{sup +} shape resonance in the elastic channel of the {ital b}{sup 3}{Sigma}{sup +} state. The magnitudes of the cross sections indicate that the {sup 2}{Sigma}{sup +} symmetry is dominant for all four peaks. In all the resonances, we find more than one partial wave contributing at energies slightly shifted with respect to each other. The present calculation represents the first {ital ab} {ital initio} study of core-excited Rydberg resonances in electron-molecule scattering.

• OSTI ID: 7243768
• Journal Information: Physical Review, A (General Physics); (USA), Journal Name: Physical Review, A (General Physics); (USA) Vol. 41:1; ISSN PLRAA; ISSN 0556-2791
• Country of Publication: United States
• Language: English

Related Subjects

640304* -- Atomic
Molecular & Chemical Physics-- Collision Phenomena
74 ATOMIC AND MOLECULAR PHYSICS
CARBON COMPOUNDS
CARBON MONOXIDE
CARBON OXIDES
CHALCOGENIDES
COLLISIONS
CROSS SECTIONS
DIFFERENTIAL CROSS SECTIONS
ELECTRON COLLISIONS
ELECTRON-MOLECULE COLLISIONS
ENERGY DEPENDENCE
ENERGY LEVELS
ENERGY RANGE
ENERGY-LEVEL TRANSITIONS
EV RANGE
EXCITATION
EXCITED STATES
INTEGRAL CROSS SECTIONS
MOLECULE COLLISIONS
MULTILEVEL ANALYSIS
OXIDES
OXYGEN COMPOUNDS
RYDBERG STATES
SCHWINGER VARIATIONAL METHOD
VARIATIONAL METHODS