title: Time-resolved dynamics of the OH stretching vibration in aqueous NaCl hydrate.
abstract: We report on the first time-resolved study of the OH stretching vibration in NaCl dihydrate with the use of two-color IR spectroscopy. The sample is characterized by conventional FTIR spectroscopy. The water molecules bound in the hydrate show two well separated absorption bands at 3426 cm(-1) and 3541 cm(-1). The transient data display an ultrafast heating of the polycrystalline ice-hydrate samples after excitation of the OH stretching vibration and its transient relaxation. The relaxation time of the low-frequency OH stretching band in the NaCl hydrate is measured to be 6.8 +/- 1 ps. The dynamics are significantly slower than those measured in neat water. This fact, together with the reproducible crystalline environment reveals the potential of aqueous hydrates for a systematic investigation of the OH stretching vibration in varying hydrogen bonding environments.
authors.affiliation: Physik-Department E11, Technische Universität München, D-85748 Garching, Germany.
authors.forename: Stanislav
authors.initials: S
authors.lastname: Pandelov
authors.forename: Bert M
authors.initials: BM
authors.lastname: Pilles
authors.forename: Jasper C
authors.initials: JC
authors.lastname: Werhahn
authors.forename: Hristo
authors.initials: H
authors.lastname: Iglev