Hayashi Yuichi, Choi Pak-Kon
Department of Physics, School of Science and Technology, Meiji University, 1-1-1 Higashimita, Tama-ku, Kawasaki 214-8571, Japan.
Ultrasonics. 2006 Dec 22;44 Suppl 1:e421-5. doi: 10.1016/j.ultras.2006.08.011. Epub 2006 Sep 11.
Spectra of multi-bubble sonoluminescence (MBSL) were measured in argon-saturated water and ethanol solutions in the concentration range 2-100 mM at the frequencies of 116 kHz and 1.0 MHz. The spectral peaks from OH-radical emission near 310 nm were observed at relatively low ultrasonic power at both frequencies. The sub-peaks at 290 and 340 nm were also observed, which are attributed to OH-radical vibronic transition. The MBSL spectra from ethanol solutions indicated that the quenching of OH-radical emission was more efficient than that of underlying continuous spectrum. The continuous spectrum suggested the decrease in temperature with increasing ethanol concentration. The concentration dependence of spectrum quenching showed no frequency dependence. A new peak was observed at 385 nm only at small ethanol concentrations and at the frequency of 1.0 MHz, which attributed to CH or CN molecule emission.
在氩气饱和的水和乙醇溶液中，于2 - 100 mM的浓度范围内，在116 kHz和1.0 MHz频率下测量了多泡声致发光（MBSL）光谱。在两个频率下，在相对较低的超声功率下均观察到了310 nm附近OH自由基发射的光谱峰。还观察到了290和340 nm处的子峰，这归因于OH自由基的振动 - 电子跃迁。乙醇溶液的MBSL光谱表明，OH自由基发射的猝灭比底层连续光谱的猝灭更有效。连续光谱表明温度随乙醇浓度的增加而降低。光谱猝灭的浓度依赖性没有频率依赖性。仅在低乙醇浓度和1.0 MHz频率下，在385 nm处观察到一个新峰，这归因于CH或CN分子发射。
