Laser assisted electron excitation of the 2 3 S state of helium is examined at electron energies near to the threshold for excitation in the field of a pulsed CO 2 laser delivering approximately 10 8 W cm -2 in the scattering region. The simultaneous electron-photon excitation cross section of helium is studied at various laser intensities and at different angles between the laser polarisation and the incident electron beam. These data are a first step towards elucidating the influence of various scattering parameters on this complex process and are compared with the results of calculations.
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Wallbank et al. (1990) studied this question.
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