钠5S态与基态钾原子的碰撞能量转移  

COLLISIONAL ENERGY TRANSFER OF THE Na (5S ) STATEBY GROUND STATE K ATOMS

作　　者：李万兴[1] 沈异凡[1] 

机构地区：[1]新疆大学物理系

出　　处：《原子与分子物理学报》1996年第3期251-256,共6页Journal of Atomic and Molecular Physics

基　　金：国家自然科学基金资助项目

摘　　要：在Ｎａ－Ｋ混合蒸汽中，利用染料激光器，将基态Ｎａ原子双光子激发到５Ｓ态。用荧光法测量了过程Ｎａ（５Ｓ）＋Ｋ（４Ｓ）→Ｎａ（３Ｓ）＋Ｋ（８Ｄ，１０Ｓ）的碰撞转移截面，Ｋ８Ｄ，１０Ｓ对Ｎａ５Ｓ的荧光比中，含有Ｋ８Ｄ１０Ｓ碰撞转移的影响。第２个实验可以消除这个影响，双光子激发Ｋ原子到８Ｄ（或１０Ｓ）探测８Ｄ（１０Ｓ）对１０Ｓ（８Ｄ）的荧光比，Ｎａ（５Ｓ）→Ｋ（８Ｄ，１０Ｓ）碰撞转移截面（１０－１５ｃｍ２）分别是１０．５±４．２和９．５±３．Two photon excitation of the ground state sodium atoms using a cw dye laser populated the Na (5S) state in the K Na vapor mixtures. The cross sections for the collisional process Na (5S) +K( 4S )→Na( 3S )+K(8 D,10S ) have been measured by observation of the resulting fluorescence. The ratio of K (8D,10S) to Na (5S) fluorescence contains a contribution from K 8D10S mixing. The contribution could effectively be subtracted out suing a second experiment in which a cw dye laser was used to pump the K8 D or 10S state, and the ratio of 8 D to 10S or 10S to 8D fluorescence was monitored. The cross sections (in 10 -15 cm 2) for Na (5S )→K (8D,10S) excitation transfer are 10.5±4.2 and 9.5±3.8 respectively.

关 键 词：碰撞能量转移 双光子激光 钠原子 钾原子 

分 类 号：O562.5[理学—原子与分子物理]