The and band systems of the CS2+ ion

Abstract

The [Formula: see text] and [Formula: see text] emission systems of the CS2+ ion have been photographed at medium resolution following controlled electron excitation of CS2 gas. Vibrational analyses have been performed for both systems. The (0010)–(0010) transitions of the [Formula: see text] and [Formula: see text] subsystems lie at 21 107 and 20 843 cm−1, respectively. Evidence is presented for Fermi resonance interactions between (100) and (020) levels in the [Formula: see text] and [Formula: see text] electronic states. The rotational structures of six partially resolved subbands of the [Formula: see text] system have been studied and a value of 1.615 Å obtained for the C—S bond length of CS2+ in the [Formula: see text] state.