Cs_2分子的光解光谱  

Photolytic Spectroscopy of Cs_2 Molecules

作　　者：刘静[1] 雷振宙[1] 周小岩[1] 戴康[1] 沈异凡[1] 

机构地区：[1]新疆大学物理系,新疆乌鲁木齐830046

出　　处：《光谱学与光谱分析》2004年第11期1299-1301,共3页Spectroscopy and Spectral Analysis

基　　金：国家自然科学基金(10264004)资助项目

摘　　要：利用HeCd激光器的4416nm线光解Cs2分子,使Cs(n2L)(nL=7P,6D)态得到布居,在Cs密度1到9×1015cm-3范围内测量原子荧光对分子荧光强度比,得到碰撞转移率系数对解离率之比分别为29×10-17和74×10-18cm3。测定CsnLJ对nLJ’荧光分支比,得到72P,62D态精细结构解离率之比分别为053和043。从远翼激发得到的精细结构转移截面与从其他激发过程得到的截面结果相符,给出了碰撞转移到6D态外(即Cs(6D)+Cs(6S)→Cs(6D)以外的态)的截面为19×10-14cm2。Populations of the n(2)L(nL=7P, 6D) states of Cs atoms by photodissociation of Cs-2 molecules through the use of the fixed frequence line 441.6 nm of a He-Cd laser radiation are produced. Combining ratios of atomic to molecular fluorescence at the Cs density range between 1 and 9 X 10(15) cm(-3), the ratios of collisional rate coefficient to predissociation rates are estimated to be 2.9 X 101(7) cm(3) and 7.4 X 10(-8) cm(3), respectively. The branching ratios are defined as the ratios of nL(j) to nL(j), fluorescence. The ratios of the dissociation rates produced in n(2)L fine-structure states are 0.53 and 0.43, respectively. Fine-structure changing cross section has been measured for far wing excitation, the result is consistent with cross section obtained from other excitation of the n(2)L states. The cross section for excitation transfer out of the 6D doublet [i.e., Cs(6D) + Cs(6S)-states other than Cs(6D)] is 1.9 X 10(-14) cm(2).

关 键 词：解离 精细结构 激发过程 分子 截面 分支比 碰撞 转移 E-CD 原子荧光 

分 类 号：O562[理学—原子与分子物理] R735[理学—物理]