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Title: Overtone spectroscopy of H{sub 2}O clusters in the v{sub OH}=2 manifold: Infrared-ultraviolet vibrationally mediated dissociation studies

Spectroscopy and predissociation dynamics of (H{sub 2}O){sub 2} and Ar-H{sub 2}O are investigated with vibrationally mediated dissociation (VMD) techniques, wherein v{sub OH}=2 overtones of the complexes are selectively prepared with direct infrared pumping, followed by 193 nm photolysis of the excited H{sub 2}O molecules. As a function of relative laser timing, the photolysis breaks H{sub 2}O into OH and H fragments either (i) directly inside the complex or (ii) after the complex undergoes vibrational predissociation, with the nascent quantum state distribution of the OH photofragment probed via laser-induced fluorescence. This capability provides the first rotationally resolved spectroscopic analysis of (H{sub 2}O){sub 2} in the first overtone region and vibrational predissociation dynamics of water dimer and Ar-water clusters. The sensitivity of the VMD approach permits several v{sub OH}=2 overtone bands to be observed, the spectroscopic assignment of which is discussed in the context of recent anharmonic theoretical calculations.
Authors:
; ; ;  [1] ;  [2] ;  [2] ;  [3]
  1. JILA, University of Colorado, Boulder, Colorado 80309 (United States)
  2. (United States)
  3. (Australia)
Publication Date:
OSTI Identifier:
20722926
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Chemical Physics; Journal Volume: 122; Journal Issue: 19; Other Information: DOI: 10.1063/1.1899157; (c) 2005 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; ARGON; COMPLEXES; DIMERS; FLUORESCENCE; LASERS; MOLECULAR CLUSTERS; OPTICAL PUMPING; PHOTOLYSIS; PHOTON-MOLECULE COLLISIONS; PREDISSOCIATION; SPECTROSCOPY; ULTRAVIOLET RADIATION; VIBRATIONAL STATES; WATER