NaK(E)态的离解和Na(3PJ)精细结构分支比

研究了Na(3S) +K(4S) +nhν→Na(3PJ) +K(4S) +(n - 1 )hν过程 ,激光频率ν调到Na共振跃迁的两翼 ,分支比定义为I(D1 ) /I(D2 ) ,I(D1 ) ,I(D2 )分别是NaD1 ,D2 线的强度 ,在K密度 2～ 8× 1 0 2 0 m-3 范围内 ,测量了从Na共振跃迁的蓝翼 30 0cm-1 到红翼 1 0 0cm-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ν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

Dissociation of the NaK (E) State and Branching Ratio of the Na(3PJ) Fine-structure Levels

The process studied is Na(3S)+K(4S)+nhν→Na(3PJ)+K(4S)+(n-1)hν, where the laser frequency ν is tuned in the wings of the Na resonance transition. The branching ratio is defined as I(D1)/I(D2) where I(D1) and I(D2) are measured intensities of the atomic NaD1 and D2 lines, respectively. The branching is determined in the K density range of 2～8×10 20 m-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 NaK near wing satellites. Fine structure changing cross section has also been measured for resonant excitation of Na3P J state. The results are discussed.