Correlation effects on Raman scattering from low-energy vibrational modes in fractal and disordered systems. I. Theory

Duval, E.; Garcia, N.; Boukenter, A.; Serughetti, J.
August 1993
Journal of Chemical Physics;8/1/1993, Vol. 99 Issue 3, p2040
Academic Journal
In disordered fractal or nonfractal systems, the disorder induces rapid fluctuations of the acoustical vibrational wave functions, so that statistics can be used to resolve the problem of Raman scattering from localized low-energy vibrations. We derive the expressions of light-vibration coupling coefficient, C(ω), as a function of the frequency ω, in the case of the dipole-induced dipole mechanism of susceptibility fluctuation and for different types of correlation, from full correlation to no-correlation. The results are compared to the existing numerical calculations. The expressions of C(ω) are determined for other mechanisms of susceptibility fluctuations, depending on an interaction propagating in the fractal.


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