Electron-impact excitation of lithium
The results of R-matrix with pseudostates (RMPS) and time-dependent close-coupling (TDCC) calculations of electron-impact excitation in Li are presented. We included 55 terms in the RMPS close-coupling expansion, of which nine are spectroscopic and 46 are pseudostates. The two-electron radial wave functions generated from earlier TDCC calculations for ionization from the ground state of Li by Colgan [Phys. Rev. A 63, 062709 (2001)] are employed to determine the TDCC excitation cross sections. The RMPS and TDCC cross sections for transitions from 1s{sup 2}2s to 1s{sup 2}2p, 1s{sup 2}3l, and 1s{sup 2}4l are compared to each other and to cross sections determined from our R-matrix calculation without pseudostates, the convergent close-coupling calculations presented by Schweinzer [At. Data Nucl. Data Tables 72, 239 (1999)], the coupled-channel optical calculations of Bray [Phys. Rev. A 47, 1101 (1993)], and experimental measurements. These results indicate that coupling to the target continuum has a significant effect on electron-impact excitation in this atom; this increases with the principal quantum number of the excited term, and is large for transitions to 1s{sup 2}4l.
- Sponsoring Organization:
- (US)
- DOE Contract Number:
- FG02-96ER54367
- OSTI ID:
- 40277057
- Journal Information:
- Physical Review A, Journal Name: Physical Review A Journal Issue: 3 Vol. 64; ISSN 1050-2947
- Publisher:
- The American Physical Society
- Country of Publication:
- United States
- Language:
- English
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