双光子共振非简并四波混频测量Ba原子里德伯态的碰撞展宽和频移  

Measurement of the argon-gas-induced broadening and shifting of the barium Rydberg levels by two-photon resonant nondegenerate four-wave mixing

作　　者：孙江[1] 孙娟[2] 王颖[1] 苏红新[1] 

机构地区：[1]河北大学物理科学与技术学院,保定071002 [2]河北大学数学与计算机学院,保定071002

出　　处：《物理学报》2012年第11期334-338,共5页Acta Physica Sinica

基　　金：国家自然科学基金青年科学基金(批准号:10804025);河北省自然科学基金(批准号:A2009000147);河北省自然科学基金基地专项(批准号:08B006;08B008)资助的课题~~

摘　　要：采用双光子共振非简并四波混频测量了Ar缓冲气压引起的Ba原子里德伯6snd^1D_2谱线系的碰撞展宽和频移,计算了n=16—33的碰撞展宽截面和频移截面.本方法是一种纯光学的测量技术,当采用窄带激光器时可以获得里德伯态的消多普勒光谱.与传统实验方法测量到的里德伯态纵向弛豫的碰撞展宽不同,本方法可以研究碰撞引起的两能态间横向弛豫的展宽.We apply two-photon resonant nondegenerate four-wave mixing with a resonant intermediate state for observing the broadening and the shifting of the barium Rydberg 6snd 1D2 series by collision with argon.The collision broadenings and the collision shifting cross sections are measured for n = 16-33.This technique is a purely optical means,and can achieve Doppler-free resolution of narrow spectral structures of Rydberg levels when the incident lasers have narrow bandwidths.Different from other experimental methods of studying the pressure dependence of the longitudinal relaxation rate of Rydberg states,our method is to investigate the pressure dependence of the transverse relaxation rate of the transition.

关 键 词：四波混频 碰撞展宽 里德伯态 

分 类 号：O437[机械工程—光学工程] O562.5[理学—光学]