Sonoluminescence of Na atom from NaCl solutions doped with ethanol.
Sonoluminescence of Na atom from NaCl solutions doped with ethanol.
复制标题
DOI：
10.1021/jp709661z
复制
发表时间：
2008-01
期刊：
影响因子：
--
通讯作者：
P. Choi;S. Abe;Y. Hayashi
中科院分区：
文献类型：
--
作者：
P. Choi;S. Abe;Y. Hayashi
在浓度为0.5 ~ 4 M的饱和氩气NaCl溶液中，以138 kHz频率测量了其声致发光光谱。在1.8 ~ 16.2 W的不同声功率范围内，观察到钠原子发射的谱线展宽。钠D线在NaCl浓度为2 M时强度最大，与KI剂量法估计的OH自由基最大生成量相对应。在不同声功率下，研究了少量乙醇的加入对谱线宽度和谱线强度的影响。钠谱线宽度随乙醇浓度和功率的增加而增加，而谱线强度随乙醇浓度的增加而强烈猝灭。结果表明，钠的发射发生在气泡内的气相。谱线展宽是由于与高压氩气的相互作用造成的，通过与光谱数据的比较，估计气泡崩塌时气体的最大相对密度为59.5。在加入乙醇后，进一步的谱线展宽和猝灭是由于与乙醇分解产生的气态产物碰撞引起的。推断钠的激发机理如下。钠离子以液滴的形式进入气泡，由于气泡内部温度高，形成盐。钠原子是由盐的离解产生的，然后由OH和H自由基进行电子激发。
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 sodium D line showed a maximum intensity at a NaCl concentration of 2 M, which corresponded to the maximum production of OH radicals estimated by KI dosimetry. The effects of the addition of a small amount of ethanol on the line width and intensity were closely investigated at various acoustic powers. The sodium line width 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 sodium emission occurs in the gas phase within bubbles. The line broadening is due to interactions with high-pressure argon, and the maximum relative density of gas at bubble collapse was estimated to be 59.5 from the comparison with spectroscopic data. Further line broadening and quenching upon the addition of ethanol arise from collisions with gaseous products obtained from the decomposition of ethanol. The mechanism of sodium excitation is inferred to be as follows. Sodium ions enter bubbles as droplets, and salts are formed because of the high temperature within bubbles. Sodium atoms are generated by the dissociation of salts and then undergo electronic excitation by OH and H radicals.