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Figure 8.22. Low-frequency Raman shifts in the Brillouin scattering of Ag nan opart ides embedded in Si02: spectra for particle sizes 2.7, 4.1, and 52 nm and (b) peak position as a function of inverse particle diameter. Theoretical calculations for spheroidal (solid lines) and torsional (clashed lines) modes with angular momenta 1=0, 1 and 2 are indicated. [From E. Duval, A. Boukenter, and B. Champagnon, Phys. Rev. Lett. 56, 2052 (1986).]

Torsional modes

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