Raman scattering for weakened bonds in the intermediate state: enhancement of low-frequency vibrations |
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| Authors: | V Hizhnyakov I Tehver V Boltrushko and G Benedek |
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| Institution: | 1.Institute of Physics,University of Tartu,Tartu,Estonia;2.Donostia International Physics Center,Donostia, San Sebastian,Spain;3.Dipartimento di Scienza dei Materiali,Università degli Studi di Milano-Bicocca,Milano,Italy |
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| Abstract: | A multimode theory of the Raman scattering in resonance with an electronic transition causing a strong weakening of atomic
bonds is proposed. Simple analytical relations between the Fourier transforms of the first- and second-order Raman amplitudes
and the absorption are derived. It is predicted that the Raman scattering on low-frequency vibrations will be strongly enhanced.
Besides the second-order Raman scattering is also enhanced as compared to the first-order scattering. The Raman excitation
profiles show a structure caused by the Airy oscillations. The shapes of the profiles of all vibrations contributing to the
weakening bond are the same as a consequence of the strong mode mixing under the virtual vibronic transition. |
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