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arXiv 0903.3147physics.atom-ph
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超冷里德堡气体共振偶极耦合自电离

Autoionization of an ultracold Rydberg gas through resonant dipole coupling

T. Amthor, J. Denskat, C. Giese, N. N. Bezuglov, A. Ekers, L. Cederbaum, M. Weidemüller

摘要:

基于里德伯对态与电离连续谱的共振耦合,我们研究了超冷里德伯气体自电离的一种可能机制。不像原子碰撞的波函数开始重叠,这里考虑的机制只涉及长程偶极相互作用,原则上是可能的静态系统。它与分子间库仑衰变(ICD)过程有关。此外,我们还考虑了相互作用引起的原子运动和多粒子系统的影响。我们发现,这种电离机制的概率可以在具有吸引力或排斥范德华相互作用的多粒子系统中增加。然而,通过共振偶极耦合的电离速率非常低。因此,这个过程不太可能对本文所述形式的里德伯气体的自电离有贡献,但它仍然可以作为二次电离过程的触发器。由于我们的图像只涉及二元相互作用,它仍然有待调查,如果集体效应的原子系综可以显着影响电离概率。尽管如此,我们的计算可以作为研究更复杂系统的起点,例如[Tanner等人,PRL 100,043002(2008)]。

英文摘要:

We investigate a possible mechanism for the autoionization of ultracold Rydberg gases, based on the resonant coupling of Rydberg pair states to the ionization continuum. Unlike an atomic collision where the wave functions begin to overlap, the mechanism considered here involves only the long-range dipole interaction and is in principle possible in a static system. It is related to the process of intermolecular Coulombic decay (ICD). In addition, we include the interaction-induced motion of the atoms and the effect of multi-particle systems in this work. We find that the probability for this ionization mechanism can be increased in many-particle systems featuring attractive or repulsive van der Waals interactions. However, the rates for ionization through resonant dipole coupling are very low. It is thus unlikely that this process contributes to the autoionization of Rydberg gases in the form presented here, but it may still act as a trigger for secondary ionization processes. As our picture involves only binary interactions, it remains to be investigated if collective effects of an ensemble of atoms can significantly influence the ionization probability. Nevertheless our calculations may serve as a starting point for the investigation of more complex systems, such as the coupling of many pair states proposed in [Tanner et al., PRL 100, 043002 (2008)].

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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