Electron-impact excitation of lithium - art. no. 032718

The results of R-matrix with pseudostates (RMPS) and time-dependent close-c oupling (TDCC) calculations of electron-impact excitation in Li are present ed. We included 55 terms in the RMPS close-coupling expansion, of which nin e are spectroscopic and 46 are pseudostates. The two-electron radial wave f unctions generated from earlier TDCC calculations for ionization from the g round state of Li by Colgan et at. [Phys. Rev. A 63, 062709 (2001)] are emp loyed to determine the TDCC excitation cross sections. The RMPS and TDCC cr oss sections for transitions from 1s(2)2s to 1s(2)2p, 1s(2)3l, and 1s(2)4l are compared to each other and to cross sections determined from our R-matr ix calculation without pseudostates, the convergent close-coupling calculat ions presented by Schweinzer et al. [At. Data Nucl. Data Tables 72, 239 (19 99)], the coupled-channel optical calculations of Bray et al. [Phys. Rev. A 47, 1101 (1993)], and experimental measurements. These results indicate th at coupling to the target continuum has a significant effect on electron-im pact excitation in this atom; this increases with the principal quantum num ber of the excited term, and is large for transitions to 1s(2)4l.