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Broad-Band Photoacoustic Dispersive Measurements and Solid-Liquid Phase Transitions of Pure Metals

The temperature dependence of the photoacoustic amplitude and phase have been measured in the neighborhood of a melting and a freezing point. The two quantities show the remarkable change in the immediate vicinity of a transition point. The modulation frequency dependence of the photoacoustic anomaly has been determined in the wide frequency range between 1 Hz and 200 kHz. It is found that the dispersion closely resembles a relaxational type.