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Ultra High Frequency Riplon Spectroscopy

Light scattering study of ripplon (surface tension waves of thermal origin) was made at a high frequency range of more than 10 MHz on pure water surface. The observed power spectra were in very good agreement with the theoretical curves strictly derived from the fluctuation dissipation theory. The two approximations currently used for the ripplon analysis were also examined, namely, the first approximation P1(ω) of two Lorentzian peaks and the second one P2(ω) with two additional terms of antisymmetric components. Contrary to most expectations, P1(ω) proved to be a much better approximation than P2(ω) that has the higher-order terms. The possibility of surface viscosity on the pure water surface was experimentally confirmed by the wide-band frequency measurement. However, the ripplon power spectra obtained up to 40 MHz showed no such evidence.