Vibrational predissociation spectra of I−·(H2O): isotopic labels and weakly bound complexes with Ar and N2

Vibrational predissociation spectra in the region of the OH stretch are reported for I−·(H2O), I−·HDO and the weakly bound complexes I−·H2O·Ar and I−·H2O·N2. The I−·HDO system consists of two isomers in Cs geometry, each displaying a similar frequency to one of the two bands observed for I−·(H2O), indicating that the motions of the two hydrogens are weakly coupled. Rotational structure is partially resolved in the 3700 cm−1 band and assigned to Q-heads of a B-type transition. Two members of the previously observed quartet [Johnson et al., Chem. Phys. Lett. 260 (1996) 551] in I−·(H2O) around 3400 cm−1 (corresponding to the hydrogen-bonded OH) persist upon complexation with either Ar or N2.