The theory of molecular collisions



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Elastic and inelastic (rotational excitation) cross sections for e - H[lowered2] scattering in the energy rarge from .01 Ryd to .6 Ryd are obtained by performing close-coupling calculations. A conventional partial wave expansion is enployed and the resulting coupled equations are solved by means of a numerical technique developed by Sams and Kouri. The T-matrix elements so obtained are combined according to the coupling rules for angular momenta to obtain the desired differential and total cross sections. A simple model interaction composed of short-range square wells plus smooth long-range terms is proposed and is used to calculate cross sections in the energy range of interest. The results of the calculation are discussed in terms of a model charge distribution and additional improvements are suggested. Considering the simplicity of the model the results compare favorably with experimental and other theoretical work.