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

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.