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Title: Vibrational predissociation spectra and dynamics of small molecular clusters of H/sub 2/O and HF

Abstract

Experimental results are presented on the vibrational predissociation spectra in the frequency range 3000 to 4000 cm/sup -1/ for the species (HF)/sub n/ and (H/sub 2/O)/sub n/, n = 2-6, using molecular beam techniques and a tunable infrared laser. The observed spectra show a dramatic change between the dimer and larger clusters which is thought to be a result of the cyclic structure of the trimer and larger clusters. The spectra are compared to calculated harmonic force constants of available intermolecular potentials to understand how these small, gas phase clusters relate to the liquid and solid phases of HF and H/sub 2/O. Additionally, the angular distributions of the predissociation products show that little energy appears as translational motion of the fragment molecules. This conclusion is consistent with recent theoretical models of the predissociation process. An upper limit of approx. 2 ..mu..sec is observed for the lifetime of the vibrationally excited clusters.

Authors:
; ; ; ; ; ;
Publication Date:
Research Org.:
Lawrence Berkeley Lab., CA (USA)
OSTI Identifier:
5455969
Report Number(s):
LBL-13740; CONF-820413-1
ON: DE82007607
DOE Contract Number:  
W-7405-ENG-48
Resource Type:
Conference
Resource Relation:
Conference: Conference on Van der Waals molecules, Oxford, UK, 5 Apr 1982
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; HYDROFLUORIC ACID; VIBRATIONAL STATES; WATER; ANGULAR DISTRIBUTION; INFRARED RADIATION; INTERMOLECULAR FORCES; LASER RADIATION; MOLECULAR BEAMS; SPECTROSCOPY; BEAMS; DISTRIBUTION; ELECTROMAGNETIC RADIATION; ENERGY LEVELS; EXCITED STATES; HYDROGEN COMPOUNDS; INORGANIC ACIDS; OXYGEN COMPOUNDS; RADIATIONS; 400201* - Chemical & Physicochemical Properties; 400500 - Photochemistry

Citation Formats

Vernon, M F, Lisy, J M, Krajnovich, D J, Tramer, A, Kwok, H S, Shen, Y R, and Lee, Y T. Vibrational predissociation spectra and dynamics of small molecular clusters of H/sub 2/O and HF. United States: N. p., 1981. Web.
Vernon, M F, Lisy, J M, Krajnovich, D J, Tramer, A, Kwok, H S, Shen, Y R, & Lee, Y T. Vibrational predissociation spectra and dynamics of small molecular clusters of H/sub 2/O and HF. United States.
Vernon, M F, Lisy, J M, Krajnovich, D J, Tramer, A, Kwok, H S, Shen, Y R, and Lee, Y T. Tue . "Vibrational predissociation spectra and dynamics of small molecular clusters of H/sub 2/O and HF". United States.
@article{osti_5455969,
title = {Vibrational predissociation spectra and dynamics of small molecular clusters of H/sub 2/O and HF},
author = {Vernon, M F and Lisy, J M and Krajnovich, D J and Tramer, A and Kwok, H S and Shen, Y R and Lee, Y T},
abstractNote = {Experimental results are presented on the vibrational predissociation spectra in the frequency range 3000 to 4000 cm/sup -1/ for the species (HF)/sub n/ and (H/sub 2/O)/sub n/, n = 2-6, using molecular beam techniques and a tunable infrared laser. The observed spectra show a dramatic change between the dimer and larger clusters which is thought to be a result of the cyclic structure of the trimer and larger clusters. The spectra are compared to calculated harmonic force constants of available intermolecular potentials to understand how these small, gas phase clusters relate to the liquid and solid phases of HF and H/sub 2/O. Additionally, the angular distributions of the predissociation products show that little energy appears as translational motion of the fragment molecules. This conclusion is consistent with recent theoretical models of the predissociation process. An upper limit of approx. 2 ..mu..sec is observed for the lifetime of the vibrationally excited clusters.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1981},
month = {12}
}

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