碰撞对钠分子梯形能级系统高位能级布居的影响  

Collisional Influence on Population of High-Lying State in Molecular Ladder-Level System

作　　者：王蔚生[1] 邓乐[1] 孙真荣[1] 丁良恩[1] 王祖赓[1] 

机构地区：[1]华东师范大学物理系教育部量子光学开放实验室

出　　处：《光学学报》2001年第9期1088-1092,共5页Acta Optica Sinica

基　　金：国家自然科学基金 (19734 0 0 3)资助课题

摘　　要：以氩气为缓冲气体 ,在实验上研究了碰撞过程对钠分子梯形能级系统高位能级两种布居过程的影响。对于双光子激发过程 ,由于消相碰撞 ,无多普勒加宽的洛伦兹尖峰随缓冲气体压力的增大而很快消失 ;加入少量缓冲气体时 ,碰撞激发过程对以多普勒宽度为特征的信号有一定的增强作用 ,但加入过量缓冲气体会由于消布居作用使信号减弱。对于主要通过碰撞实现高位能级布居的过程 ,加入缓冲气体对高位能级布居起关键作用。Using Ar as buffer gas, the collisional influence on two different population ways of high lying state in Na 2 ladder level system is studed experimently. For two photon transition, because of dephasing collision, Doppler free Lorentz peak will vanish via the increasing of buffer gas pressure. Injecting little buffer gas to the cell will enhance the Doppler width signal because of collisional excitation, but too much buffer gas will decrease the signal because of population eliminating effect. For collisional high lying state population, injection of buffer gas will be the key function to high lying state population. The explanation in the term of rate function has been given.

关 键 词：碰撞 梯形能级系统 速率方程 钠分子 氩气 高位能级 布居 

分 类 号：O561.5[理学—原子与分子物理]