Differential and integral cross sections for electron collisional excitation of 3P-1D and 3P-1S transitions in atomic oxygen

Abstract

Differential and integral cross sections for excitation of the 3P-1D and 3P-1S transitions by electron impact in atomic oxygen are presented in the energy region from 4 to 30 eV and these are compared, where available, with other calculations and experiments. The R-matrix method is used in the three-state (2p4 3P, 1D and 1S) and six-state (2p4 3P, 1D, 1S, 3SO, 3PO and 3DO) levels of the close-coupling approximation. The present results for the 3P-1D transition are in good agreement with the measurement of Shyn and Sharp (1986), but normally discrepancies exist with the experiment of Doering and Gulcicek (1989) at low energies (E<or=20 eV). The calculated integral cross sections for the 3P-1S transition are generally smaller than the available experiments.