Photoionization of nS and nD Rydberg atoms of Rb and Cs from the near-infrared to the ultraviolet spectral region
Photoionization of nS and nD Rydberg atoms of Rb and Cs from the near-infrared to the ultraviolet spectral region
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DOI：
10.1088/1367-2630/ac00d5
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发表时间：
2021-01
影响因子：
3.3
通讯作者：
M. Viray;E. Paradis;G. Raithel
中科院分区：
文献类型：
--
作者：
M. Viray;E. Paradis;G. Raithel
我们使用 Marinescu 等人 (1994 Phys. Rev. A 49 982) 的模型势，计算了铷和铯里德堡原子对于波长范围从红外到紫外的光的光电离 (PI) 截面。通过研究自由电子波函数可以确定明显的 PI 最小值的起源。其中包括 Rb 和 Cs 的 nS 至 ϵP PI 通道中的宽 PI 最小值，具有自由电子能量 ϵ，被识别为库珀最小值。 nD 到 ϵF 通道中 PI 最小值更窄是由于自由电子态的形状共振。我们描述了测量 PI 最小值的可能实验程序，并讨论了它们在基础原子物理学以及实际应用中的含义。里德伯原子的 PI 截面测量可以作为原子核心区域里德伯电子多电子相互作用的敏感探针。
We present calculations of the photoionization (PI) cross sections of rubidium and cesium Rydberg atoms for light with wavelengths ranging from the infrared to the ultraviolet, using model potentials from Marinescu et al (1994 Phys. Rev. A 49 982). The origins of pronounced PI minima are identified by investigating the free-electron wavefunctions. These include broad PI minima in the nS to ϵP PI channels of both Rb and Cs, with free-electron energy ϵ, which are identified as Cooper minima. Much narrower PI minima in the nD to ϵF channels are due to shape resonances of the free-electron states. We describe possible experimental procedures for measuring the PI minima, and we discuss their implications in fundamental atomic physics as well as in practical applications. Measurements of PI cross sections of Rydberg atoms may serve as a sensitive probe for many-electron interactions of the Rydberg electron in the atomic core region.