Relaxation and Anharmonic Couplings of the O-h Stretching Vibration of Asymmetric Strongly Hydrogen-bonded Complexes.
From: Chemistry Department, The University of Iowa, Iowa City, Iowa 52242, USA.
The Journal of chemical physics
- Publish Date: Jul 2007
- ISSN: 0021-9606
- Volume: 127
- Issue: 4
- Pages: 044501
- Medium: Print
- Language: English
- Citation (JAMA): Gündoğdu Kenan, Bandaria Jigar, Nydegger Michael, et al. Relaxation and Anharmonic Couplings of the O-h Stretching Vibration of Asymmetric Strongly Hydrogen-bonded Complexes.. Jul 2007;127:044501
Abstract
We present infrared transient grating measurements of complexes of formic acid with pyridine and pyrazine at four excitation frequencies within the broad proton-stretching band. These experiments investigate the mechanism of the line broadening of the O-H stretching vibration. The transients show coherent oscillations that decay within a few hundred femtoseconds and population relaxation on two time scales. We fit the data using a simple model of three coupled oscillators that relax via sequential kinetics through an intermediate state. Based on this model, we conclude that the coherent oscillations result from superpositions of Fermi-resonance-coupled states involving formic acid overtone and combination states.
Mesh Headings (Keywords): Binding Sites, Computer Simulation, Hydrogen, Hydrogen Bonding, Hydroxyl Radical, Kinetics, Models, Chemical, Models, Molecular, Molecular Conformation, Oscillometry, Oxygen, Vibration
Check for Full Text / PubMed Unique Identifier (PMID): 17672701
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