Electron-molecule scattering calculations in a 3D finite element R-matrix approach

Details Electron-molecule scattering calculations in a 3D finite element R-matrix approach Electron-molecule scattering calculations in a 3D finite element R-matrix approach

2004-06-29

arxiv.org/abs/physics/0406152v1

Physics

Chemical Physics

17 pages, 8 figures, TeX (RevTex4), double spaced

Scientific paper

10.1063/1.1829056

We have implemented a three-dimensional finite element approach, based on tricubic polynomials in spherical coordinates, which solves the Schrodinger equation for scattering of a low energy electron from a molecule, approximating the electron exchange as a local potential. The potential is treated as a sum of three terms: electrostatic, exchange and polarization. The electrostatic term can be extracted directly from ab initio codes (GAUSSIAN 98 in the work described here), while the exchange term is approximated using different local density functionals. A local polarization potential approximately describes the long range attraction to the molecular target induced by the scattering electron.

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