TITLE

Broad Raman scattering and luminescence in β-carotene solution

AUTHOR(S)
Nakamura, R.; Yamamoto, S.; Nakahara, J.
PUB. DATE
July 2002
SOURCE
Journal of Chemical Physics;7/1/2002, Vol. 117 Issue 1, p238
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Resonant secondary radiation spectra of dilute β-carotene solution (10[sup -4]-10[sup -5] M) are measured under stationary excitation. The excitation energy is varied within 0-0 and 0-1 transition energies in the S[sub 2]-S[sub 0] transition of β-carotene. When the excitation energy is varied from the peak of the 0-0 absorption band to the low-energy side at 60 K and 175 K, (a) the line shape of 0-0 emission band changes from symmetric to asymmetric, and (b) the intensity of luminescence rapidly decreases as compared with the intensity of Raman scattering by v[sub l], v[sub 2], and v[sub 3] intramolecular vibronic modes of β-carotene. When the 0-1 absorption band is excited, we successfully separate luminescence and broad Raman component (BR), which is resonant Raman scattering of low-frequency phonon modes in solution. The line shape of the density of vibronic states weighed by the coupling strength between electronic states in a dye molecule and vibrations of the surrounding atoms (WDOS) is determined by BR. Taking into account inhomogeneous broadening and assuming linear electronphonon coupling, the resonant secondary radiation spectra are calculated using obtained WDOS. The above characters of the experimental results (a) and (b) are well reproduced by the calculations.
ACCESSION #
6831311

 

Related Articles

Share

Read the Article

Courtesy of VIRGINIA BEACH PUBLIC LIBRARY AND SYSTEM

Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics