近日，中山大学（珠海校区）的胡师林副研究员与中科院应用物理与计算数学研究所的Bi Chengrui以及中国科学技术大学的Chen Jing等合作，研究了强空间非均匀场中的原子里德伯格态激发。相关成果已于2023年3月7日在国际学术期刊《物理评论A》上发表。

该研究团队采用从头算方法研究了氢原子在空间均匀激光场和非均匀激光场作用下的里德伯格态激发过程。研究发现，与暴露在空间均匀激光场中的原子相比，原子在空间非均匀激光脉冲中的激发概率降低，电子倾向于占据较低主量子数和角量子数的态。

此外，未考虑里德伯格态中电子相干捕获后的电离的量子模型计算与从头算法计算的结果不一致。分析表明，这些有趣的特征可以归因于非均匀激光场增强了里德伯格态的电离，因为高主量子数和角量子数的里德伯格态分布在远离核心的地方，而不均匀电场在那里变得显著。

附：英文原文

Title: Atomic Rydberg-state excitation in strong spatially inhomogeneous fields

Author: Shilin Hu, Xiaopeng Yi, Li Guo, Chengrui Bi, Jing Chen

Issue&Volume: 2023/03/07

Abstract: We investigated the Rydberg-state excitation process of a hydrogen atom subjected to spatially homogeneous and inhomogeneous laser fields by means of ab initio calculations. It is found that, comparing with atoms exposed to spatially homogeneous laser fields, the excitation probability decreases and the electron tends to occupy the states with lower principal quantum numbers and angular quantum numbers for atoms in spatially inhomogeneous laser pulses. Furthermore, calculations of a quantum model without taking into account ionization of the electron after it is coherently captured by the Rydberg state are inconsistent with the above-stated findings by ab initio calculations. Analysis indicates that the aforementioned intriguing features can be attributed to the enhanced ionization of the Rydberg states by inhomogeneous laser fields since the distributions of Rydberg states of high principal quantum numbers and angular quantum numbers locate far away from the core where the inhomogeneous electric fields become significant.

DOI: 10.1103/PhysRevA.107.033104

Source: https://journals.aps.org/pra/abstract/10.1103/PhysRevA.107.033104