Abstract
By using a simple model, the sharp bands at about 495 and 606 cm −1 in the Raman spectrum of vitreous SiO 2 have been identified as due to vibrational modes of regular rings with 4- and 3-members, respectively. For that the restrictions in the Si–O–Si intertetrahedral angle, which depends on the number of members in a ring, are taken into account. Our model also predict infrared (IR) features, corresponding to ring structures, these vibrational IR modes might be weak and quite broad and probably buried by the LO–TO pairs modes at 1160–1250 cm −1.
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