Electron-impact ionization of Li+

PINDZOLA, M. S.; MITNIK, D. M.; COLGAN, J.; GRIFFIN, D. C.

PHYSICAL REVIEW A - ATOMIC, MOLECULAR AND OPTICAL PHYSICS

The American Physical Society

Año: 2000 vol. 61 p. 52712 - 52722

1050-2947

Electron-impact ionization cross sections for Li+ are calculated using the R matrix with pseudostates method and time-dependent close-coupling theory. The largest R-matrix calculation includes 11 spectroscopic states from the configurations 1s2, 1s2l, and 1s3l; an additional 56 pseudostates from the configurations 1sn¯l with n¯=4-10 and l=0-3 and enough continuum orbitals to adequately describe incident energies up to 175 eV. The largest time-dependent close-coupling calculations involved 16 partial differential equations on a 300Ã�300 point radial lattice. The nonperturbative R matrix with pseudostate and time-dependent close-coupling calculations, as well as perturbative distorted-wave calculations, are in good agreement with the crossed-beams experimental measurements of Lineberger et al. [Phys. Rev. 141, 151 (1966)], but are slightly above the Peart and Dolder [J. Phys. B 2, 872 (1968)] and MÌller et al. [Phys. Rev. Lett. 63, 758 (1989)] measurements.