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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Excitation of Sodium Atoms Attached to Helium Nanodroplets: The 3p - 3s Transition Revisited
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Excitation of Sodium Atoms Attached to Helium Nanodroplets: The 3p - 3s Transition Revisited

机译：钠原子附着在氦纳米液滴上的激发：重新讨论了3p <-3s过渡

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摘要

The dynamics of Na atoms on the surface of helium nanodroplets following excitation via the 3p <- 3s transition has been investigated using state-specific ion-based detection of the products. Excitation of the system to the 3p (2)Pi states is found to lead to the desorption of both bare Na and NaHe exciplexes. The associated speed distributions point to an impulsive desorption process for Na products and a thermally driven process for the NaHe exciplexes. In contrast, excitation of the 3p (2)Sigma state leads exclusively to the impulsive desorption of Na atoms. In this case, the desorption is accompanied by a helium-induced relaxation process, as evidenced by the large fraction of detected Na P-2(1/2) atoms. The relaxation process is thought to be related to a crossing between the 2 Pi(1/2) and (2)Sigma potential energy curves at large distance.
机译：使用基于状态的基于离子的产物检测，研究了通过3p <-3s跃迁激发后的氦纳米液滴表面Na原子的动力学。发现将系统激发为3p（2）Pi态会导致裸Na和NaHe激基复合物解吸。关联的速度分布指向Na产品的脉冲解吸过程和NaHe激基复合物的热驱动过程。相反，激发3p（2）Sigma状态仅导致Na原子的脉冲解吸。在这种情况下，解吸伴随着氦气诱导的弛豫过程，如检测到的大部分Na P-2（1/2）原子所证明的。弛豫过程被认为与大距离处的2 Pi（1/2）和（2）Sigma势能曲线之间的交叉有关。

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