Bandshape parameter dependence on temperature and solvent dynamics in absorption spectra and Raman excitation profiles of beta-carotene
✍ Scribed by A.M. Kjær; N.J. Kjær; J. Ulstrup; M.G. Zakaraya
- Publisher
- Elsevier Science
- Year
- 1989
- Tongue
- English
- Weight
- 738 KB
- Volume
- 157
- Category
- Article
- ISSN
- 0009-2614
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✦ Synopsis
We have investigated lifetime and solvent broadening, represented by a Voigt profile, for absorption spectra of g-carotene in isopentane, acetone and ethanol over a wide temperature range. The analysis provides good broadening parameters and displacement for the strong Q2, mode, whereas the 4 and a, displacements are poorly determined. The temperature and solvent dependence of the Gaussian width suggest that homogeneous solute-solvent interactions dominate, but inhomogeneous broadening and solvent structural effects are also important. The bandshape parameters have been used to calculate the Q, fundamental and 2R, overtone Raman excitation profiles by means of a new theory of strong, homogeneous Raman profile broadening.