PHOTOIONIZATION PROCESSES IN NO IN THE THRESHOLD REGION

The photoion excitation spectrum of NO has been measured in the 9.26-1 3.8 eV region using synchrotron light and the isotopic targets (NO)-N- 14-O-16, (NO)-N-15-O-16 and (NO)-N-15-O-18. The resulting complex spec tra have been interpreted using ab initio results based on many-body t heory. The ab initio predictions suggest that the structure follows fr om autoionizations of four repulsive valence states of (2) Sigma symme try and interactions between an attractive (2) Delta valence state and Rydberg series converging to the NO+ ground state. (C) 1997 Published by Elsevier Science B.V.