超声射流冷却S_2自由基激光诱导荧光激发谱  

The laser-induced fluorescence excitation spectrum of jet-cooled S_2 radicals

作　　者：余旭锋[1] 张朝霞[2] 郑贤峰[1] 崔执凤[1] 陈旸[1] 

机构地区：[1]安徽师范大学物理与电子信息学院,芜湖241000 [2]中国科学技术大学化学物理系,合肥230026

出　　处：《原子与分子物理学报》2008年第4期795-802,共8页Journal of Atomic and Molecular Physics

基　　金：国家自然科学基金(20328305;20433080)

摘　　要：在超声射流条件下,采用SF6/Ar（-10%）混合气束脉冲直流放电方法产生S2自由基,观测了32S2自由基在30000-35500 cm^-1波段的激光诱导荧光激发谱.通过对所观测到的40多个振动谱带的归属,确定其中28个谱带为S2自由基B^3∑^-μ-X^3∑^-g跃迁的（ν′=1-9,0）,（ν′=1-8,1）,（ν′=1-7,2）和（ν′=2-5,3）四个谱带序列.通过对所获谱带的转动分析,得到更为丰富的S2自由基B^3∑^-μ-X^3∑^-g跃迁谱带的转动光谱常数和更为精确的B^3∑^-μ电子态的平衡分子常数：Te,ωe,ωeχe,Be,αe和Re.另外,还测得所有观测到的谱带的寿命,进一步丰富了S2自由基B^3∑^-μ-X^2∑^-g跃迁谱带的光谱信息.The laser-induced fluorescence excitation spectrum of jet-ccoled S2 radicals in the range of 30000- 35000 cm^-1 has been observed. The S2 radicals were produced by adc discharge of a mixture of SF6 and Ar with assistant copper electrodes under supersonic jet condition. Combined with previous studies, more than forty observed vibrational bands have been recorded and in which 28 bands have been assigned to（ ν′ = 1 - 9, 0）,（ν′=1-8,1）,（ν′=1 -7,2） and （ν′ =2-5,3） bands of the B^3∑^-μ X^3∑^-g transition. A rotational analysis of these bands has been performed and effective molecular parameters for the B^3∑^-μ have been determined by fitting almost all observed vibronic bands except the illegible ones. moreover, the lifetimes of all the observed bands have been measured.

关 键 词：S2自由基 激光诱导荧光激发谱 超声射流 谱带寿命 

分 类 号：O561.3[理学—原子与分子物理]