INVESTIGADORES
MITNIK Dario Marcelo
artículos
Título:
Electron-impact excitation of lithium
Autor/es:
GRIFFIN, D. C.; MITNIK, D. M.; COLGAN, J.; PINDZOLA, M. S.
Revista:
PHYSICAL REVIEW A - ATOMIC, MOLECULAR AND OPTICAL PHYSICS
Editorial:
The American Physical Society
Referencias:
Año: 2001 vol. 64 p. 32718 - 32728
ISSN:
1050-2947
Resumen:
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 et al.
[Phys. Rev. A 63, 062709 (2001)] are employed to determine the TDCC
excitation cross sections. The RMPS and TDCC cross sections for
transitions from 1s22s to 1s22p, 1s23l,
and 1s24l 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 et al.
[At. Data Nucl. Data Tables 72, 239 (1999)], the coupled-channel optical
calculations of Bray et al. [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 1s24l.