稀土盐水溶液单泡声致发光中的特征光谱

Characteristic spectra of single-bubble sonoluminescence in the rare-earth salt aqueous solutions

在溶有稀有气体的稀土盐氯化铽水溶液中进行了单泡声致发光光谱的研究.在固定驱动超声频率、不同驱动声压下,观察到了一系列OH自由基从第一激发态A2Σ+到基态X2Π各振动能级跃迁所产生的谱线,包括波长307nm处的(0,0)跃迁谱线,335nm处的(0,1)跃迁谱线以及276nm处的(1,0)跃迁谱线等.实验结果表明较高的驱动声压有利于276nm处谱线的产生,而较低的驱动声压则有利于307与335nm处谱线的产生.通过定义线状光谱与连续谱的光强比,定量地表征了线状光谱在总光谱中的相对强度,并给出了驱动声压对各跃迁谱线光强比的影响.

The single-bubble sonoluminescence spectra of the terbium chloride aqueous solutions dissolved with the noble gas Ar are studied in this paper. Under the condition of fixed driving ultrasonic frequency and different sound pressures, a series of line spectra is identified as emissions from the transitions of OH radical vibrational levels from the first excited state A^2∑^＋ to the ground state X^2П, including （0, 0） transition at 307 nm, （0, 1） transition at 335 nm and （1, 0） transition at 276 nm and so on. The experimental results show that higher sound pressure is conducive to the appearance of the line spectrum at 276 nm while lower sound pressure is favorable for the appearance of the line spectra at 307 nm and 335 nm. The relative intensity of the line spectrum in the total spectrum is expressed quantificationally by defining an intensity ratio of the line spectrum to the continuous spectrum. In addition, the effects of the driving sound pressure on the intensity ratios of different line spectra are given.