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

Journal Article · Sun May 15 04:00:00 EDT 2005 · Journal of Chemical Physics

DOI:https://doi.org/10.1063/1.1899157· OSTI ID:20722926

Nizkorodov, Sergey A; Ziemkiewicz, Michael; Nesbitt, David J; Knight, Alan E.W. ^[1]

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1. JILA, University of Colorado, Boulder, Colorado 80309 (United States)

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.

• OSTI ID: 20722926
• Journal Information: Journal of Chemical Physics, Journal Name: Journal of Chemical Physics Journal Issue: 19 Vol. 122; ISSN JCPSA6; ISSN 0021-9606
• Country of Publication: United States
• Language: English

Related Subjects

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