在样品池条件下， 利用原子荧光光谱方法， 测量了Cs(6DJ)与H2 , He碰撞中的反应与非反应能量转移截面。 利用脉冲激光886nm线双光子激发Cs(6S)到Cs(6D3/2)态， 原子荧光中除含有6D3/2→6P的直接荧光外， 还含有6D5/2→6P的转移荧光。 利用三能级模型的速率方程分析， 在不同的He和H2密度下， 分别测量直接荧光与转移荧光的时间积分荧光强度比， 得到了6D3/2与H2和He碰撞的精细结构转移截面分别为σ=(55±13)×10-16和(16±4)×10-16 cm2， 同时确定了6D5/2与H2和He的碰撞猝灭速率系数。 6D5/2态与H2的碰撞猝灭速率系数比6D5/2与He的大， 它是反应与非反应速率系数之和， 利用实验数据确定非反应速率系数为6.3×10-10 cm3·s-1， 得到6D5/2与H2的反应截面为(2.0±0.8)×10-16 cm2。 利用不同H2（或He）密度下6D5/2→6P3/2时间积分荧光强度， 得到6D3/2与H2反应截面为(4.0±1.6)×10-16 cm2， 6D3/2与H2反应的活性大于6D5/2。

Cs vapor, mixed with a gas was irradiated in a glass fluorescence cell with pulses of 886nm radiation from a YAG-laser-pumped OPO laser, populating 6D3/2 state by two-photon absorption. Cross sections for 6D3/2→6D5/2 transition induced by collisions with various He atoms and H2 molecules were determined using methods of atomic fluorescence. The resulting fluorescence included a direct component emitted in the decay of the optically excited state and a sensitized component arising from the collisionally populated state. At the different densities, we have measured the relative time-integrated intensities of the components and fitted a three-state rate equation model to obtain the cross sections for 6D3/2→6D5/2transfer: σ=(55±13)×10-16 and (16±4)×10-16 cm2 for H2 and He, respectively. The cross sections for the effective quenching of the 6D5/2 state were also determined. The total transfer rate coefficients from the 6D5/2 state for He is small ［1.2×10-10 cm3·s-1］. The total quenching rate coefficient of the 6D5/2 state is larger for H2［6.7×10-10 cm3·s-1］. For H2 case, the quenching rate coefficient corresponds to reaction and nonreactive energy transfer. Evidence suggests that the nonreactive energy transfer rate coefficient is ［6.3×10-10 cm3·s-1］. Hence the authors estimated the cross section (2.0±0.8)×10-16 cm2 for reactive process Cs(6D5/2)+H2→CsH+H. Using the dependence on the pressure of H2（or He）of the integrated fluorescence monitored at the 6D5/2→6P3/2 transition the cross section (4.0±1.6)×10-16 cm2 for Cs(6D3/2)+H2→CsH+H was obtained. Thus, the relative reactivity with H2 follows an order of Cs(6D3/2)>Cs(6D5/2).