A ZEKE photoelectron study of the D-2 Pi and 3(2)Sigma(+) satellite statesof CO+

The zero kinetic energy (ZEKE) photoelectron spectrum of CO has been obtain ed from 22.3-23.75 eV with resolution of 0.7 meV and shows the structure of the (DII)-I-2 (nu(+)= 0-8) and 3(2)Sigma(+) (nu(+) = 0-4) bands. The inten sity with which these are formed at threshold, band origins, rotational con stants and spin orbit splittings of the (DII)-I-2 state are reported. The d ecreased Lifetimes of the (DII)-I-2, nu(+) = 3, 4 levels are also recorded. All states observed are above the lowest dissociation limit of the ion, an d these spectra provide information about the intramolecular dynamics in th is high energy region. (C) 1999 Elsevier Science B.V. All rights reserved.