Picosecond time-resolved CSRS study of vibrational dephasing of bulk modes perturbed by electronic state of dilute impurities
✍ Scribed by Ta-Chau Chang; Hung-Wen Li; Tzu-Chung Hsieh; Shiow-Hwa Chou
- Publisher
- Elsevier Science
- Year
- 1993
- Tongue
- English
- Weight
- 631 KB
- Volume
- 213
- Category
- Article
- ISSN
- 0009-2614
No coin nor oath required. For personal study only.
✦ Synopsis
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-' vibron and shorter decay times for the 766 and 1385 cm-' 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-' signal, measured from the time-resolved CSRS spectra, is actually due to the vibrational dephasing of the 767 cm-' mode of pentacene impurity molecule. Possible mechanisms are proposed to explain the impurity perturbed domains effect on the dephasing of the 1385 cm-' vibron, but not of the 511 and 766 cm-' vibrons.