Femtosecond time-resolved coherent Raman scattering from β-carotene in solution. Ultrahigh frequency (11 THz) beating phenomenon and sub-picosecond vibrational relaxation
✍ Scribed by Hiromi Okamoto; Keitaro Yoshihara
- Publisher
- Elsevier Science
- Year
- 1991
- Tongue
- English
- Weight
- 406 KB
- Volume
- 177
- Category
- Article
- ISSN
- 0009-2614
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✦ Synopsis
Femtosecond time-resolved coherent anti-Stokes Raman scattering (CARS) has been observed for all-trans S-carotene in various solvents. A regular oscillating pattern ( I I THz) owing to the beat among the two strong Raman transitions ( * 1520 and z 1150 cm-') is observed when the frequency difference between the pump and Stokes radiation is set in-between the two strong Raman bands. The vibrational relaxation rate has been measured for the "in-phase" C-C stretching band. The relaxation rate is found to be T2z0.6 ps and independent of solvent. This rate is due to intramolecular vibrational relaxation.