Communication: Feshbach resonances in the water molecule revealed by state-selective spectroscopy

Journal Article · Sat Aug 28 00:00:00 EDT 2010 · Journal of Chemical Physics

DOI:https://doi.org/10.1063/1.3472312· OSTI ID:21559905

Grechko, Maxim; Maksyutenko, Pavlo; Rizzo, Thomas R; Boyarkin, Oleg V ^[1]

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1. Laboratoire de Chimie Physique Moleculaire, Ecole Polytechnique Federale de Lausanne, Station 6, CH-1015 Lausanne (Switzerland)

We employ triple-resonance vibrational overtone excitation to access quasibound states of water from several fully characterized bound states of the molecule. Comparison of the measured dissociation spectra allows a rigorous assignment of rotational quantum numbers J, nuclear spin and parity, and a tentative vibrational characterization of the observed resonances. Their asymmetrical shapes (Fano profiles) reflect interference of dipole moments for transitions to these resonances with that to the dissociative continuum. The assignments and Fano profile parameters of the resonances stand as a benchmark for the extension of accurate quantum-mechanical calculations to activated complexes of water. The narrow widths of some of these resonances indicate that water molecules may survive for as long as up to 60 ps in states above the dissociation threshold. We consider the possible implication of such long-lived states for the kinetics of water dissociation and the OH+H association reaction.

• OSTI ID: 21559905
• Journal Information: Journal of Chemical Physics, Vol. 133, Issue 8; Other Information: DOI: 10.1063/1.3472312; (c) 2010 American Institute of Physics; ISSN 0021-9606
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
BENCHMARKS
COMPARATIVE EVALUATIONS
DIPOLE MOMENTS
DISSOCIATION
EXCITATION
FLUORESCENCE
MOLECULES
PARITY
PHOTOCHEMISTRY
PHOTOLYSIS
QUANTUM MECHANICS
QUANTUM NUMBERS
REACTION KINETICS
RESONANCE
ROTATIONAL STATES
SPECTRA
SPECTROSCOPY
SPIN
VIBRATIONAL STATES
WATER
ANGULAR MOMENTUM
CHEMICAL REACTIONS
CHEMISTRY
DECOMPOSITION
EMISSION
ENERGY LEVELS
ENERGY-LEVEL TRANSITIONS
EVALUATION
EXCITED STATES
HYDROGEN COMPOUNDS
KINETICS
LUMINESCENCE
MECHANICS
OXYGEN COMPOUNDS
PARTICLE PROPERTIES
PHOTOCHEMICAL REACTIONS
PHOTON EMISSION