Rb（7^2D）态与基态K原子的碰撞能量转移

Ｋ－Ｒｂ混合蒸汽中，使用Ｒｂ光谱灯和染料激光器，将基态Ｒｂ原子二步激发到７＾２Ｄ态用荧光法测量了过程Ｒｂ（７＾２Ｄ）＋Ｋ（４Ｓ）→Ｒｂ（５Ｓ）＋Ｋ（７Ｓ，５Ｄ），的碰撞转移截面，Ｋ７Ｓ，５Ｄ对Ｒｂ７＾２Ｄ的荧光比中，含Ｋ７Ｓ＾←→５Ｄ碰撞转移的影响，第二个实验可以消除这个影响，利用Ｋ光谱灯和染料激光器产生Ｋ７Ｓ或５Ｄ态，探测Ｋ７Ｓ（５Ｄ）对５Ｄ（７Ｓ）的荧光比，Ｒｂ７Ｄ→Ｋ７Ｓ，５Ｄ碰撞转移截面（

Collisional energy transfer of the Rb (7 2D) state by ground state K atoms]

In the K-Rb vaper mixtures, the two-photon stepwise excitation of rubidium atoms from the ground state to the state Rb 7 2D is obtained by the use of a rubidium lamp and a cw dye laser. The cross sections for the collisional process Rb (7 2D) +K (4S) -->Rb (5S) +K (7S. 5D) have been measured by observation of the resulting fluorescence. The ratio of K (7S. 5D) to Rb7D fluorescence contains a contribution from K 7S<==>5D mixing. The contribution could effectively be subtracted out using a second experiment in which a potassium lamp and a cw dye laser were used to pump the K7S or 5D state, and the ratio of 7S to 5D or 5D to 7S fluorescence was monitored. The cross sections (in 10(-15)cm2) for Rb7D-->K7S. 5D excitation transfer are 25.8 +/- 10. 3 and 1.5 +/- 0.6 respectively.