Abstract
A threshold photoelectron spectrometer is described. The instrument has a resolution (FWHM) of 14 meV for states reached by direct photoionization, and 90% rejection of electrons from autoionizing events occuring more than 30 meV above direct ionization thresholds. Detailed threshold photoelectron and total photoionization efficiency spectra are presented for three electronic states (2Πg, 2Πu, 2Σ+u) of the CO+2 ion. Vibrational excitation in the symmetric stretching mode is observed for each state with the longest progression occuring for the 2Πu state. Spin–orbit splitting of the 2Πg state is readily visible. Autoionization occurs in the vicinity of most of the 2Πg and 2Πu levels. There is some indication for production of ions with vibrational excitation in the bending mode.
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