铯分子亚稳电子态中高位振动态的产生和弛豫

Formation and relaxation of Cs_2（1~3Πu）metastable state in high vibrational levels

研究了Cs2〔13Πu(v)〕和Cs原子间的振动能量转移。利用激光感生荧光(LIF)探测Cs2〔13Πu(v)〕的弛豫过程,由时间分辨LIF的对数描绘得到振动态的有效寿命,从不同Cs原子密度下的有效寿命利用Stern-Volmer公式得到振动能级的弛豫率,速率系数随v的增加而增大。从相邻二振动能级的布居密度之比得到振动弛豫速率常数kv,v-1。在高位振动态的传能过程中,多量子弛豫(Δv>1)是重要的。

We have investigated the vibrational energy transfer rate constants between Cs2（13Πu（v））and Cs atoms.Laser induced fluorescence（LIF）was used to detect collisionally relaxed Cs2（13Πu（v））.The semilog plots of the time-resolved LIF at different dendities of Cs had been obtained.The slopes yielded the effective lifetimes.From such data several Stern-Volmer plots can be constructed and the relaxation rate constants can be extracted for the sum of all process that give rise to the delay of the prepared vibrational state.The vibrational relaxation rate is increasing with vibrational quantum number.The ratios of the populations of the neighboring states were measured.The state（v） to state（v-1）vibrational relaxation rate constants kv,v-1were obtained.Multiquantum relaxation（Δv1） was found to be important at high vibrational states.