Abstract

Non-empirical calculations at the STO-4.31G level are reported on the ground-state and core-ionized states of HCN and H 2C 2. An analysis of the changes in bond lengths and force constants for the normal modes involving stretching vibrations allows direct computation of the overall band profiles for the core-ionized levels. The distinct asymmetries arising from the vibrational excitations accompanying core ionizations suggest that the experimental investigations of these systems would be eminently worthwhile.

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