Intramolecular and intermolecular vibrational energy relaxation of CH2I2 dissolved in supercritical fluid

K. Sekiguchi; A. Shimojima; O. Kajimoto

doi:10.1016/S0009-2614(02)00371-8

Intramolecular and intermolecular vibrational energy relaxation of CH₂I₂ dissolved in supercritical fluid

K. Sekiguchi, A. Shimojima, O. Kajimoto

Research output: Contribution to journal › Article

23 Citations (Scopus)

Abstract

A pump-probe experiment was performed to examine vibrational population relaxation of diiodomethane (CH₂I₂) molecule dissolved in supercritical CO₂. Using an apparatus with femtosecond time resolution, we observed the contributions of intramolecular vibrational energy redistribution (IVR) and intermolecular vibrational energy transfer (VET) separately. IVR and VET rates were measured with varying solvent densities at a constant temperature. It is shown that the IVR rate is not density dependent while the VET rate increases with increasing density from 0.4 to 0.8 g cm^-3. This observation suggests that the rate of the VET process is determined by solute-solvent collisions whereas the IVR rate is not much affected by solute-solvent interaction.

Original language	English
Pages (from-to)	84-90
Number of pages	7
Journal	Chemical Physics Letters
Volume	356
Issue number	1-2
DOIs	https://doi.org/10.1016/S0009-2614(02)00371-8
Publication status	Published - 2002 Apr 15
Externally published	Yes

ASJC Scopus subject areas

Physics and Astronomy(all)
Physical and Theoretical Chemistry

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10.1016/S0009-2614(02)00371-8

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Sekiguchi, K., Shimojima, A., & Kajimoto, O. (2002). Intramolecular and intermolecular vibrational energy relaxation of CH₂I₂ dissolved in supercritical fluid. Chemical Physics Letters, 356(1-2), 84-90. https://doi.org/10.1016/S0009-2614(02)00371-8

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abstract = "A pump-probe experiment was performed to examine vibrational population relaxation of diiodomethane (CH2I2) molecule dissolved in supercritical CO2. Using an apparatus with femtosecond time resolution, we observed the contributions of intramolecular vibrational energy redistribution (IVR) and intermolecular vibrational energy transfer (VET) separately. IVR and VET rates were measured with varying solvent densities at a constant temperature. It is shown that the IVR rate is not density dependent while the VET rate increases with increasing density from 0.4 to 0.8 g cm-3. This observation suggests that the rate of the VET process is determined by solute-solvent collisions whereas the IVR rate is not much affected by solute-solvent interaction.",

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