Entrance channel X-HF (X=Cl,Br and I) complexes studied by high-resolution infrared laser spectroscopy in helium nanodroplets

摘要

Rotationally resolved infrared spectra are reported for halogen atom-HF free radical complexes formed in helium nanodroplets.An effusive pyrolysis source is used to dope helium droplets with Cl,Br and I atoms,formed by thermal dissociation of C1_2,Br_2 and I_2.A single hydrogen fluoride molecule is then added to the droplets,resulting in the formation of the X-HF complexes of interest.Analysis of the resulting spectra confirms that the observed species have ~2PI_(3/2) ground electronic states,consistent with the linear hydrogen bound structures predicted from theory.Stark spectra are also reported for these species,from which the permanent electric dipole moments are determined.