Abstract
Anomalous peaks have been observed in the photoelectron spectra of certain diatomic and triatomic molecules when the pressure in the ionization chamber is relatively high. These are attributed to collisions between emitted photoelectrons and neutral molecules leading to the formation of temporary negative ion states. Both vibrational excitation and resonant electron transmission phenomena are reported. The precision of the measurements compares favourably with results obtained by conventional electron impact techniques.
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