Abstract
We calculate the differential and the total cross sections for the direct excitation of the 3/sup 3/S state of helium from the metastable 2/sup 3/S state by electron impact using the Glauber and Born methods. For the Glauber cross-section calculation we use the analytic method of Thomas and Chan to reduce the Glauber amplitude for charged-particle-neutral-atom collisions to a one-dimensional integral representation involving modified Lommel functions. The calculations are made for incident electron energies between 3 and 1000 eV, and for two different sets of 3/sup 3/S wave functions. The results of the differential and the total excitation cross sections are compared with all other available theoretical calculations.
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