Electron-impact excitation of Li to high principal quantum numbers

M. Witthoeft, J. Colgan, M. S. Pindzola, C. P. Ballance, D. C. Griffin

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

The time-dependent close-coupling method is used to calculate electron-impact excitation cross sections for the Li(2s)--{\textgreater}Li(nl) and Li(2p)--{\textgreater}Li(nl) transitions at incident energies just above the ionization threshold. The implementation of the time-dependent close-coupling method on a nonuniform lattice allows the study of continuum-coupling effects in excitations to high principal quantum number, i.e., n{\textless}=10. Good agreement is found with R-matrix with pseudostates calculations, which also include continuum-coupling effects, for excitations to low principal quantum number, i.e., n{\textless}=4. Poor agreement is found with standard distorted-wave calculations for excitations to all principal quantum numbers, with differences still at the 50% level for n=10. We are able to give guidance as to the accuracy expected in the n3 extrapolation of nonperturbative close-coupling calculations of low n cross sections and rate coefficients.
Original languageEnglish
Pages (from-to)022711
Number of pages1
JournalPhysical Review A
Volume68
Issue number2
DOIs
Publication statusPublished - 2003

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