The Effect of Hydrostatic Pressure and Temperature on Sonoluminescence of Metal Atoms from Aqueous Salt Solutions

摘要

We have measured the spectra of multi-bubble sonoluminescence from aqueous LiCl, NaCl, MgCl2, CaCl2, CuSO4 solutions, saturated with argon, at the frequency 22 kHz. The spectra were collected at different hydrostatic pressures for all salts and in the ambient temperature range of 1–20 °C for NaCl solutions. Total absorbed ultrasonic power was 41 W. The results show that line emission from exited state metal atoms grows rapidly with the increase of hydrostatic pressure and at low ambient temperature. In all cases the increase of the intensity of underlying continuum and OH-radical emission was much lower than that of atomic emission at the same experimental conditions. The observed effects can be explained assuming higher temperature inside the cavitation bubbles during collapse in case of increased static pressure or decreased vapor pressure.