铋原子激光共振电离（LRI）跃迁及其电离效率

Laser Resonance Ionization Transition and Efficiency for Atoms of Bismuth

金属铋（Ｂｉ）是高温超导材料的重要成分，微量铋元素的检测具有广泛的应用价值和重要的基础研究意义，本文就Ｎｄ：ＹＡＧ及其泵浦的染料激光进行铋原子三步共振电离，求解了非饱和共振过程的速率方程，在一些典型实验条件下，计算出基态和激发态的共振吸收截面，给出电离效率分别与二步激发速率，电离速率以及作用时间的变化关系，得出饱和激发电离的流量条件和通量条件等，并进行了一系列讨论．

In this paper,the rate equations for a three level system are solved in cases of unsaturation excitation and ionization. Under the condition of typical experiment, we calculate resonance absorption cross section for initial state and excitant state, gained that the ionization efficiency relating to the rate of excitation and ionixation and the interaction time respectivily, and obtained that the conditions on the photon flux and fluence for the saturated excitation and ionization. Last we carry out a series of discussion.