Cs2分子的光解离和碰撞能量转移

利用He-Cd+激光器的441.6 nm线光解Cs2分子,使Cs(6D)态得到布居,在Cs2密度为1～9×1015 cm-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为9.6×10-18 cm3.测定Cs(6D3/2)对6D5/2荧光强度分支比,得到62D态精细结构能级解离率之比为0.41.从翼激发得到的精细结构转移截面与从共振激发得到的截面结果相符.

Photodissociation of Cs2 molecules and collisional energy transfer

Population of the 62D state of Cs atoms by photodissociation of Cs2 molecules through the use of thefixed frequency line 441.6 nm of a He-Cd+l aser radiation is produced.Combining ratio of atomic tomolecular fluorescence，the ratio of collisional rate coefficient to predissociation rate is estimated to be 9.6*10-18cm3.The branching ratio is defined as the ratio of 6D3/2to6D5/2 fluorescence.The branching isdetermined in the Cs density range between 1 and 9*1015 cm-3.The ratio of the dissociation rates producedin the Cs62D fine-structure states is 0.41.Fine-structure changing cross section has been measured forwingexcitation，the result i sconsistent with cross section obtained from resonant excitation of the 62D states.