抄録
Sonoluminescence from alkali-metal atom solutions is described in this review. Sonoluminescence spectra from argon-saturated NaCl solution were measured in the concentration range of 0.5-4 M at the frequency of 138 kHz. The line broadening of sodium-atom emission was observed at various acoustic powers in the range from 1.8 to 16.2 W. The effects of the addition of small amount of ethanol on the linewidth and intensity were closely investigated. The sodium linewidth increases with ethanol concentration and also with power, whereas the line intensity is strongly quenched with increasing ethanol concentration. The results conclusively show that the sodiuni emission occurs in the gas phase within bubbles. Frequency dependences of K-atom linewidth and intensity were investigated. The linewidth decreased with increasing frequency, and the intensity took maximum value at 115 kHz. Discussion was made in terms of foreign gases interacting with K atoms.
