Download Advances in Electronics and Electron Physics, Vol. 57 by Claire Marton (Ed.) PDF

By Claire Marton (Ed.)

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08 eV below the ionization potential. 001 eV below that limit. The cross sections were reported to rise from below lo-', cm2 for quantum numbers n c 25, to well over cm2 for quantum numbers of about 40. Cross sections for specific Rydberg states of xenon in collision with SF, were measured more recently by West et al. 2 x lo-" cm2, for f states with n from 25 to about 40. The comparison has been made of Rydberg state collisions of rare gas atoms with polyatomics and with atoms and diatomic molecules.

The interpretation as vibrational excitation is strongly supported by the study of Azria et al. (1980) of the intensity of zero-energy scattered electrons as a function of the energy of incident electrons. It is clear from this work that at every energy threshold for excitation of a new state of vibrationally excited HC1, one finds some scattered electrons that have given up essentially all their energy, presumably to vibrational excitation, and also a drop in the cross section for dissociative attachment.

1964; Bardsley, 1968a). The formulation of the rate in this manner was refined to take proper account of the angular momentum of the restrictions on the incoming electron and the capturing molecule (Chen and Peacher, 1967). Chen and Peacher also argue that the kinetic energy of the nuclei at their point of no return must be large relative to the inverse of the survival probability-that is, dissociation must be rather more probable than auto detachment of the electron-or the rate of dissociative attachment may vary significantly with the rotational state of the capturing molecule.

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