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Quasiclassical trajectory study of collisional energy transfer in toluene systems. I. Argon bath gas: energy dependence and isotope effects
Experimental studies of collisional energy transfer from highly vibrationally excited toluene to various bath gases have recently been reported [Toselli and Barker, J. Chem. Phys. 97, 1809 (1992), and references therein]. A quasiclassical trajectory investigation for toluene in argon bath gas at 300 K for initial internal energies E'=41 000, 30 000, and 15 000 cm(-1) is reported here. Collisional energy transfer is almost linearly dependent on E'. Predictions of energy transfer quantities are very sensitive to the average well depth of the assumed individual pairwise potentials, but is less sensitive to the detailed shape. Qualitative and quantitative agreement with experiment is obtained where the overall well depth is physically realistic. Isotope studies using Ar-40 and pseudohelium (Ar-4) bath gases indicate that energy transfer is independent of the mass of the bath-gas collider, but perdeuteration increases (Delta E(2))(1/2) by 13% over the undeuterated values.
History
Journal
Journal of Chemical PhysicsVolume
100Issue
10Pagination
7385 - 7399Publisher
A I P PublishingLocation
Melville, N.Y.Publisher DOI
ISSN
1089-7690Language
engPublication classification
C1.1 Refereed article in a scholarly journalCopyright notice
1994, American Institute of PhysicsUsage metrics
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collisional energy transfer (CET)molecular dynamics (MD)quasiclassical trajectory (QCT)argon bath gaspseudo-helium (4Ar) bath gasenergy transfertrajectory modelsintermolecular forcesrotatational energy transferangular momentumScience & TechnologyPhysical SciencesChemistry, PhysicalPhysics, Atomic, Molecular & ChemicalChemistryPhysicsHIGHLY EXCITED MOLECULESRANDOM-WALK MODELPOLYATOMIC-MOLECULESDEACTIVATIONAZULENETEMPERATURERELAXATION
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