Effect of CC Coherent Vibration on Relative Raman Scattering Cross Sections of All-trans beta-Carotene

TL;DRAbstract

We have determined the Raman scattering cross sections(RSCSs) of β-carotene for C=C and C―C stretching modes, with the 1444 cm -1 Raman band of cyclohexane as internal standard, in different solvents at low concentrations by measuring Raman intensity. The results show that RSCSs of β-carotene were 10 6 ―10 7 times larger than the general RSCSs, we analyzed that this enhancement was caused not only by the resonance Raman effect but also by nonlinear coherent CC vibration in aqueous β-carotene. Moreover, overtone and combinations of it were also observed and their intensities were 10%―20% of those of their fundamentals when β-carotene was dissolved in non-polar solvents, respectively. Keywords Raman scattering cross section; Electron-phonon coupling; Coherent vibration Article ID 1005-9040(2010)-04-608-04

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