Proton-impact excitation of lithium using a time-dependent close-coupling method

Journal Article · Tue Nov 15 04:00:00 EST 2011 · Physical Review. A

DOI:https://doi.org/10.1103/PHYSREVA.84.052712· OSTI ID:22093532

Lee, Teck-Ghee; Pindzola, M. S. ^[1]

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1. Department of Physics, Auburn University, Auburn, Alabama 36849 (United States)

A time-dependent close-coupling method, formulated within the framework of a rotational function expansion in two-dimensional cylindrical coordinates, is used to investigate excitation processes in proton-lithium collisions. As a first check, the calculated Li(1s{sup 2}2s){yields}Li(1s{sup 2}2p) excitation cross sections are compared and shown to be in reasonable agreement with the previous Cartesian lattice time-dependent Schroedinger equation results for collision energies at 5, 10, and 15 keV. As a result, additional calculations are carried out to determine the cross sections not only for the Li(1s{sup 2}2s){yields}Li(1s{sup 2}2p) transitions, but also for the Li(1s{sup 2}3l) transitions for a wider range of proton-impact energies from 2 to 50 keV. Reasonable agreement is found when further comparison of the dominant Li(1s{sup 2}2p) excitation cross sections is made with data obtained from crossed-beams experiments and other close-coupling methods. With the present extensive and large-scale calculations, the convergence for the reported results is also addressed, especially for the less-dominant Li(1s{sup 2}3l) transitions, with respect to the box sizes, number of coupled channels, and propagation time.

• OSTI ID: 22093532
• Journal Information: Physical Review. A, Journal Name: Physical Review. A Journal Issue: 5 Vol. 84; ISSN 1050-2947; ISSN PLRAAN
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
COMPARATIVE EVALUATIONS
COUPLED CHANNEL THEORY
COUPLING
CROSS SECTIONS
ELECTRONIC STRUCTURE
EXCITATION
ION-ATOM COLLISIONS
KEV RANGE
LITHIUM
PROTONS
SCHROEDINGER EQUATION
TIME DEPENDENCE
TWO-DIMENSIONAL CALCULATIONS