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Chinese Journal of Quantum Electronics

Cs-K混合蒸气中Cs(8D)+K(4S)碰撞能量转移

沈异凡, 沈晓燕

Published Jan 1, 2004• 0 citations
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Abstract

在Cs-K混合蒸气中,两步激发Cs原子到8D态,观察了Cs(8D)+K(4S)→Cs(5D)+K(4P)碰撞能量合并逆过程(REP,reverse energy pooling)。应用双调制技术探测K(4P)原子发射的荧光,基态K原子密度用光学吸收方法测量。得到了REP速率系数,讨论了其它过程对速率系数的影响.

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Chinese Journal of Quantum Electronics•Jan 1, 2004•0 citations
测量了K-Cs混合蒸气中碰撞能量合并过程K(4P)+Cs(5D)→Cs(6S)+K(4D, 6S)速率系数, 测量是相对于已知速率系数的过程[即Cs(6P)+Cs(5D)→Cs(6S)+Cs(7DJ)]进行的. 利用激光光解K2和Cs2分子, 得到Cs(6P, 5D)和K(4P)态原子, 探测直接由光解离产生的原子发射的与由碰撞转移而布居的原子激发态发射的荧光的相对强度, 结合Cs(6P)和K(4P)态的有效寿命, 得到异核碰撞能量合并速率系数分别为2.6×10-9和3.6×10-9 cm3*s-1. 讨论了其他过程对速率系数的影响.
Using two steps excitation of the cesium 8D atomic level in a cesium-potassium vapor mixture, we observed the reverse heteronuclear energy-pooling collision Cs(8D)+K(4S) →Cs(5D)+K(4P) at thermal energy. A double-modulation technique has been used to select the fluorescence contributions at the K(4PJ) exit channels due only to the above reactions. The ground state potassium atom density was measured by the absorption of line from a K hollow-cathode lamp. The measured density and fluorescence intensities have been used to obtain reverse energy-pooling rate coefficients. The contribution to the rate coefficients from other processes is discussed.