Far-infrared laser vibration—rotation—tunneling spectroscopy of the propane—water complex: Torsional dynamics of the hydrogen bond

Abstract

The far-infrared laser vibration—rotation—tunneling (FIR-VRT) spectrum of the propane—water complex has been measured in the range 18—22 cm-1. A C-type VRT band has been assigned with a band origin of 19.6 cm-1. The data support the ‘‘kite-shaped’’ structure determined from microwave spectroscopy in the accompanying paper, and indicate that the observed VRT band corresponds to torsional motion of the free water proton about the hydrogen bond. This motion is impeded by a barrier that is less than 5 cm-1. We describe our modification of the supersonic slit-jet source designed to permit Stark effects to be measured, and have used second-order Stark shifts to help assign the perpendicular transition observed.

Publisher

AIP Publishing

Publication Date

11-15-1993

Publication Title

Journal of Chemical Physics

Department

Chemistry and Biochemistry

Document Type

Article

DOI

https://dx.doi.org/10.1063/1.465724

Keywords

Propane, Water, Complexes, Far infrared radiation, Lasers, Tunnel effect, Vibrational states, Torsion, Hydrogen bonds, Rotational states, Protons, Potential barrier, Supersonic flow, Modifications, Jets, Stark effect, Infrared spectra

Language

English

Format

text

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