Comparison of electron emission cross sections from autoionizing states of helium by electron impact and H+, H2+and He impacts

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Abstract
A comparison has been made of the experimental electron emission cross sections from autoionizing states of helium for electrons, H+, H2+, and He incident at the same velocity of relative motion on helium in the backward ejection angles. While emission cross sections from the singlet states, (2s2) 1S, (2p2) 1D, and (2s2p)1P, have broad maxima in 100-200 eV region for electron impact, the maxima for the other projectile impacts appear in the energy region corresponding to much slower velocities. The emission cross section from the (2s2p) 3P state excited by electrons is of quite different features as compared with those by the other projectiles.