We report quantal calculations of elastic differential and momentum transfer cross sections for the scattering of electrons by H2O at low and intermediate collision energies, i.e., from 2 to 20 eV. The fixedhyphen;nuclei approximation (FNA) was employed and a singlehyphen;center expanded (SCE) wave function was used to represent the molecular target. The wellhyphen;known divergence in the forward direction was corrected via Born closure formulas (see the text) and a parameterhyphen;free model, previously tested for methane targets, was used to describe exchange and polarization effects. The present results can be used to adequately describe angular distributions even at very small angles and can be extended beyond the largest angles that have been experimentally measured. The behavior of momentumhyphen;transfer cross sections as a function of energy, and the comparison of our results with other statichyphen;exchange (SE) calculations, which use an entirely different approach, are presented and discussed.
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