Relaxation of the H2O Overtone Bending Vibration in the Water Dimer···Hydroxyl Radical Complex

The relaxation mechanism of the overtone bending vibration in the collision of the water dimer with the vibrationally excited hydroxyl radical is studied by use of trajectory procedures. The transfer of the OH­(v = 1) energy to the dimer stretches is followed by a near-resonant first overtone transi...

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Published inThe journal of physical chemistry. A, Molecules, spectroscopy, kinetics, environment, & general theory Vol. 122; no. 25; pp. 5510 - 5517
Main Author Shin, H. K
Format Journal Article
LanguageEnglish
Published American Chemical Society 28.06.2018
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Summary:The relaxation mechanism of the overtone bending vibration in the collision of the water dimer with the vibrationally excited hydroxyl radical is studied by use of trajectory procedures. The transfer of the OH­(v = 1) energy to the dimer stretches is followed by a near-resonant first overtone transition to the donor monomer. Nearly a quarter of the trajectories undergo a complex-mode collision, forming the (H2O)2···OH complex bound by a hydrogen bond with the lifetime ranging from a subpicosecond scale to >100 ps. The overtone vibration relaxes to the ground state, transferring approximately half of its energy to the dimer hydrogen-bonding (H2O···H2O) and the remaining half to the complex hydrogen-bonding (H2O)2···OH, via near-resonant pathways, each consisting of a series of intermolecular low-frequency vibrations.
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ISSN:1089-5639
1520-5215
DOI:10.1021/acs.jpca.8b03674