摘要
在U型管声致发光装置的基础上建立了一套新型的声致发光装置—直管圆锥泡声致发光装置,详细地介绍了此装置的结构和实验操作步骤,利用此装置得到了超强的发光脉冲。测量得到了乙二醇溶液中圆锥泡声致发光的发光脉冲,结果显示脉冲半宽度大约为80μs左右,远远高于其他声致发光形式所产生的脉冲宽度,这主要是由于圆锥泡可以获得远远高于超声声致发光中气泡所能得到的能量。发光光谱为一从紫外光至可见光波长范围的连续谱,上面叠加C2有d3Πg→d3Πu的跃迁形成的五个序列谱带,分别对应于Δν=-2,Δν=-1,Δν=0,Δν=1和Δν=2;同时叠加有CN的B2Σ+→X2Σ+跃迁形成的3个序列谱带和CH的A2Δ→X2Π跃迁谱带。特别是实验中测量得到了斯旺带光谱序列谱带清晰的振动结构。最后,通过与理论模拟得到的斯旺带光谱相对强度的比较,估算得到了C2分子的振动温度大约为(4 200±200)K。
Based on the U-tube,a new type of sonoluminescence apparatus-conical bubble sonoluminescence straight tube apparatus was set up,and the structures and operations were described detailedly.Using the apparatus,the ultrabright cavitation luminescence was obtained in glycol solution.The light pulses of conical bubble sonoluminescence were detected,results show the half width is about 80 μs that is much longer than the results by ultrasound,which should be caused by the fact that the conical bubble can obtain more energy from the flow than the bubbles from the ultrasound.The spectra consist in a broad background ranging from the ultraviolet regioo to the visible region,on which five clear sequences of Swan bands and three sequences of B 2Σ＋→X 2Σ＋ transition of CN are superimposed.A band assigned to the A 2Δ→X 2Π transition of CH was also measured.Specially,the vibrational structures of Swan bands can be resolved.Finally,the achieved molecular vibrational temperature of C2 is estimated to be about（4 200±200） K.
出处
《光谱学与光谱分析》
SCIE
EI
CAS
CSCD
北大核心
2008年第11期2507-2510,共4页
Spectroscopy and Spectral Analysis
基金
国家自然科学基金项目(20273077)
重大基础研究前期研究专项课题(2002CCA03400)
河北大学校内青年基金项目(2005Q06)资助
关键词
声致发光
光脉冲
光谱
斯旺带
振动温度
Sonoluminescence,Light pulses,Spectra,Swan band,Vibrational temperature
