q-dependence of low-frequency Raman scattering in silica glass

Details q-dependence of low-frequency Raman scattering in silica glass q-dependence of low-frequency Raman scattering in silica glass

1999-04-27

arxiv.org/abs/cond-mat/9904386v1

Phys. Rev. Lett., 82, 4476 (1999)

Physics

Condensed Matter

Soft Condensed Matter

4 pages, 3 figures

Scientific paper

10.1103/PhysRevLett.82.4476

Accurate measurements of the dependence of low-frequency Raman scattering on the scattering angle were performed in two silica glasses. By a comparison of spectra measured at a large scattering angle (close to back scattering) and a small one (close to forward scattering), we for the first time observed a q-dependence of the low-frequency light scattering in glasses. From the magnitude of the effect, the vibration correlation length is estimated and compared with results from the picosecond optical technique; a reasonable agreement is found.

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