Vacuum ultraviolet laser spectra of ICl

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Abstract
Vacuum ultraviolet fluorescence excitation spectra of jet cooled ICl have been recorded between 158 and 166 nm using a VUV ‘‘laser’’ generated by four‐wave sum‐mixing in Mg vapor. An unambiguous vibrational analysis of the spectra has shown that transitions from v‘=0 of the ground state probe high vibrational levels of the first tier EO+ ion‐pair state between v’=245 and 360. Molecular constants obtained from both Dunham and near dissociation expansions are presented. Strong intensity modulation of the spectra was observed. Possible reasons for this effect are discussed.