Vibrational relaxation of CH2I2 in solution: Excitation level dependence | Zendy

Christopher G. Elles | Zendy; Dieter Bingemann | Zendy; Max M. Heckscher | Zendy; F. Fleming Crim | Zendy

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Vibrational relaxation of CH2I2 in solution: Excitation level dependence

Author(s) -

Christopher G. Elles,

Dieter Bingemann,

Max M. Heckscher,

F. Fleming Crim

Publication year - 2003

Publication title -

the journal of chemical physics

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.071

H-Index - 357

eISSN - 1089-7690

pISSN - 0021-9606

DOI - 10.1063/1.1554396

Subject(s) - overtone , vibrational energy relaxation , excitation , intramolecular force , intermolecular force , chemistry , relaxation (psychology) , vibrational energy , atomic physics , molecule , spectral line , physics , stereochemistry , psychology , social psychology , astronomy , organic chemistry , quantum mechanics

Transient electronic absorption monitors the flow of vibrational energy in methylene iodide (CH2I2) following excitation of five C–H stretch and stretch–bend modes ranging in energy from 3000 to 9000 cm−1. Intramolecular vibrational relaxation (IVR) occurs through a mechanism that is predominantly state-specific at the C–H stretch fundamental but closer to the statistical limit at higher excitation levels. The IVR times change with the excitation energy between the fundamental and first C–H stretch overtone but are constant above the overtone. The intermolecular energy transfer (IET) times depend only weakly on the initial excitation level. Both the IVR and the IET times depend on the solvent [CCl4, CDCl3, C6D6, C6H6, or (CD3)2CO] and its interaction strength, yet there is no energy level dependence of the solvent influence.

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