A study of pseudoresonances in the application of the Schwinger variational principle to electron scattering from atomic hydrogen

Journal Article · Sun Jan 01 04:00:00 EST 1989 · International Journal of Quantum Chemistry; (United States)

DOI:https://doi.org/10.1002/qua.560360813· OSTI ID:5539475

Weatherford, C A; Odom, G; Tucker, R ^[1]

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1. Florida Agricultural and Mechanical University, Tallahassee (USA)

The Schwinger variational principle is applied to s-wave electron-hydrogen atom scattering. Computationally, consistent with a recent paper by Apagyi et al. (1988), there are pseudoresonances at the static exchange level of approximation, but not at the static level. The T-matrix as well as the K-matrix version of the Schwinger principle is used with a real Slater basis, and the same results are obtained in both. The origin of the pseudoresonances from singularities in the separable potential that is effectively employed in the Lippman-Schwinger equation from which the Schwinger variational principle can be derived. The determination of the pseudoresonance parameters from the separable potential is computationally inexpensive and may be used to predict the pseudoresonance parameters for the scattering calculations so as to avoid them. 19 refs.

• OSTI ID: 5539475
• Journal Information: International Journal of Quantum Chemistry; (United States), Journal Name: International Journal of Quantum Chemistry; (United States) Vol. 23; ISSN 0020-7608; ISSN IJQCB
• Country of Publication: United States
• Language: English

Related Subjects

640304* -- Atomic
Molecular & Chemical Physics-- Collision Phenomena
74 ATOMIC AND MOLECULAR PHYSICS
ATOM COLLISIONS
COLLISIONS
COMPUTERIZED SIMULATION
ELECTRON COLLISIONS
ELECTRON-ATOM COLLISIONS
ELEMENTS
ENERGY LEVELS
GROUND STATES
HYDROGEN
NONMETALS
PARTIAL WAVES
RESONANCE
S WAVES
SCATTERING
SIMULATION
SINGULARITY
VARIATIONAL METHODS