[论文解读] Non-dipole effects in two-photon sweeping of the K-shell of an atomic ion

A. N. Hopersky, A. M. Nadolinsky+2 more|arXiv (Cornell University)|Mar 7, 2026

Quantum optics and atomic interactions被引用 0

一句话总结

The paper includes non-dipole corrections to the two-photon K-shell sweeping process, showing a giant reduction (several orders of magnitude) in generalized cross-sections for Fe16+ compared with the dipole approximation.

ABSTRACT

In the work [1], within the framework of a dipole approximation for the radiation transition operator, of the second-order nonrelativistic quantum perturbation theory and the Hartree-Fock single-configuration approximation, the first theoretical study of the generalized cross-section of the direct two-photon sweeping out of the K-shell of a light neon atom was carried out. In this Letter we supplement the Preprint [2] with the results of taking into account non-dipole effects when constructing the amplitude of the probability of the radiation transition between continuum-spectrum states. As the main result, it was found that the non-dipole effects reduce the generalized cross-sections of two-photon sweeping out of the K-shell of an atomic ion (Fe16+) the calculated in the dipole approximation by several orders of magnitude (giant non-dipole effect).

研究动机与目标

• Assess the impact of non-dipole effects on the two-photon sweeping out of the K-shell in atomic ions

提出的方法

• Extend the previous dipole-approximation framework to include non-dipole contributions in the transition operator for continuum states

实验结果

研究问题

• RQ1 How do non-dipole terms modify the amplitude for two-photon transitions from the K-shell?
• RQ2 What is the quantitative impact of non-dipole effects on the generalized cross-section for K-shell two-photon sweeping in atomic ions like Fe16+?

主要发现

• Non-dipole effects reduce the generalized cross-sections for two-photon K-shell sweeping compared with the dipole-approximation results
• The reduction is by several orders of magnitude, described as a giant non-dipole effect
• The study provides the first quantitative assessment of non-dipole contributions in this specific two-photon ionization process
• Results pertain to continuum-state transition amplitudes within a nonrelativistic framework corrected for non-dipole terms
• The findings supplement prior work that used dipole approximation for the radiation transition operator and Hartree-Fock single-configuration approximation