Abstract
An experimental study of the low-frequency, low-temperature Raman scattering from two-level systems (TLS) has been carried out for a series of soda-lime-silica glasses with various amounts of CaO and BaO and also for a Steuben (PbO) glass. Raman scattering from the resonant interaction with TLS is observed for both kinds of glasses. Because of the experimental precision of these measurements, it has been possible to estimate the Raman-active TLS number density and to show that it does not scale with the strength of the boson peak in the vibrational spectrum. The cutoff in the Raman activity of TLS for all of these glasses is consistent with earlier far-infrared absorption studies.
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