Formation and predissociation of CO+2(? 2Σ+<i>g</i>)

Abstract

The discrepancy between photoionization mass spectrometry and photoelectron spectroscopy in the CO+/O+ ratio from CO2 at 584 Å is resolved by new measurements. New features in the photoelectron spectrum of CO+2(? 2Σ+g) lead to a new vibrational analysis, with vibration frequencies close to those of CO2(?1 Σ+g). The observations are discussed in terms of a perturbation of the ? 2Σ+g state by the ionization continuum of either the ? 2Πg state or the 4Πu state of CO+2.