NaCs激发态的预离解和碰撞去布居

Predissociation and Collisional Depopulation of the NaCs Excited State

激光激发光学薄的Cs-Na混合蒸汽,激光频率v调到Na共振跃迁的两翼,NaCs分子激发态预离解到Na3P1/2或3P3/2态,分支比定义为I（D1）/I（D2）,I（D1）,I（D2）分别是NaD1,D2线的强度,在Cs密度2～8×1014cm-3范围内,测量了从Na共振跃迁的蓝翼300cm-1到红翼100cm-1的分支比,得到了离解率之比和精细结构转移截面,在近翼,分支比与v有很大的关系。用对Na3PJ态共振激发的方法,也得到了精细结构转移截面,对结果进行了讨论.

An optically thin gaseous mixture of Cs and Na is excited by the CW dye laser, the laser frequency v is tuned in the wings of the Na resonance transitions. The excited NaCs molecule is predissociated into the Na3P1/2 or 3P3/2. The branching ratio is defined as 7(D1)/I(D2) where I(D1) and I(D2) are measured intensities of the atomic NaD1 and D2 lines. The branching is determined in the Cs density range 2 to 8 × 1014cm-3. The ratio is measured for detuning ranging from about 300 cm-1 in the blue wing to 100 cm-1 in the red wing of the Na3P multiplet. The ratio of dissociation rates and the fine structure changing cross section are obtained. The branching is found to be strongly detuning dependent in the vicinity of the NaCs near-wing satellites. Fine structure changing cross section has also been measured for resonant excitation of Na3~2PJ state. The results are discussed.