The scattering of light in fused quartz and its Raman spectrum

Abstract

A detailed study of the scattering of light in fused quartz and its Raman spectrum has been made. A rectangular specimen of fused quartz of optical A quality has been used. The depolarisation factors ρ_u, ρ_v and ρ_h have been measured. They are respectively 11.5%, 5% and 80%. The intensity of scattering in fused quartz is found to be 1/3.5 of that in pure dust-free ether. The Doppler-shifted components in the light scattered by fused quartz have been recorded using λ 2536 excitation both for the case of transverse scattering and backward scattering. The observed frequency shifts are in general agreement with those calculated from the known elastic constants of fused quartz. The Raman spectrum of fused quartz has been recorded with λ2536 excitation. The recorded spectrum exhibits six lines and six bands of varying width and intensity. The frequency shifts are 285, 370, 430, 495, 635, 660,30→120, 775→805, 810→845, 885→940, 1022→1098 and 1140→1245 cm^-1 Besides, there is a weak continuum extending from, 30 cm^-1 to 500 cm^-1 with well-defined edges.