Resonant Raman scattering in amorphous bulk selenium

The resonant Raman spectrum of a-Se bulk has been observed in the low frequency region and in the range of the wavelength 5145ndash;6328 Å.The maximum of the resonance is centered at 5998 Å and shows a sharp peak at 31 cm^?1 Stokes shift, whose intensity varies with wavelength.The experimental data were interpreted, and related to the behaviour of the derivative of the dielectric function in the same material.