Electron-impact ionization cross sections for the ground and excited states of the N atom are calculated using the non-perturbative R-matrix with pseudo-states and time-dependent close-coupling (TDCC) methods, as well as the perturbative distorted-wave method. The TDCC and distorted-wave results for the 1s(2)2s(2)2p(2)3l (l = 0-2) excited configurations are much larger than for the ground configuration. In all cases the TDCC results are substantially lower than the distorted-wave results. The ionization cross section results will lead to a better understanding of moderately dense astrophysical and laboratory plasmas containing nitrogen.
机构:
Harvard Univ, Dept Chem & Chem Biol, 12 Oxford St, Cambridge, MA 02138 USAHarvard Univ, Dept Chem & Chem Biol, 12 Oxford St, Cambridge, MA 02138 USA
Ciccarino, Christopher J.
Savin, Daniel W.
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Columbia Univ, Columbia Astrophys Lab, 550 West 120th St,MC 5247, New York, NY 10027 USAHarvard Univ, Dept Chem & Chem Biol, 12 Oxford St, Cambridge, MA 02138 USA