Abstract
The low-energy electron collision with neutral oxygen has been investigated using a modified R-matrix method based on the B-spline representation of the scattering orbitals. Integral cross sections for elastic scattering and for excitation of the 3P-1D, 3P-1S and 1D-1S transitions are presented in the energy region from threshold to 30 eV. Accurate representation of target wavefunctions has been obtained on the basis of the non-orthogonal orbitals. Both the correlation and relaxation effects are shown to be important. The close-coupling expansion consists of the 26 spectroscopic bound and autoionizing target states. A calculation with 26 spectroscopic states and 17 pseudo-states has also been carried out to check the effect of coupling to the continuum. The present results for the elastic scattering are in excellent agreement with the measurements, but large discrepancies with the existing experimental data are found for the 3P-1D and 3P-1S transitions. The excitation cross sections agree well with the recent R-matrix calculation with pseudo-states by Thomas et al (Thomas M R J, Bell K L and Berrington K A 1997 J. Phys. B: At. Mol. Opt. Phys. 30 4599) except for lower energies about 5-7 eV of threshold.
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