Picosecond time-resolved CSRS study of vibrational dephasing of bulk modes perturbed by electronic state of dilute impurities
Journal
Chemical Physics Letters
Journal Volume
213
Journal Issue
5-6
Pages
564-570
Date Issued
1993
Author(s)
Abstract
We have found that the decays of vibrons are mode-specifically perturbed by the impurity electronic state. We observe normal decay time for the 511 cm-1 vibron and shorter decay times for the 766 and 1385 cm-1 vibrons of host molecules (naphthalene) when the excitation energy is tuned into the electronic transition of guest molecules (pentacene). Isotopic study elucidates that shorter decay time of the 766 cm-1 signal, measured from the time-resolved CSRS spectra, is actually due to the vibrational dephasing of the 767 cm-1 mode of pentacene impurity molecule. Possible mechanisms are proposed to explain the impurity perturbed domains effect on the dephasing of the 1385 cm-1 vibron, but not of the 511 and 766 cm-1 vibrons. © 1993.
SDGs
Type
journal article