2025/05/26 by Yi-Jia Mao, Shen, Bo-Ren, Mao, Yi-Jia +10 · 1 citation
Physics and Astronomy · #Atomic Physics (physics.atom-ph) #FOS: Physical sciences #Laser-Matter Interactions and Applications #Photorefractive and Nonlinear Optics #Spectroscopy and Quantum Chemical Studies
paper · pdf · doi:10.48550/arxiv.2505.19681
openalex publication_date 2025/05/26 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We present first-principles numerical simulations of photoionization in neon induced by bichromatic extreme ultraviolet pulses with frequencies ω and 2ω, specially chosen to make ω equal to the energy difference between the 2s and 2p subshells. This allows for the production of photoelectrons from the 2s shell by 2ω pulse and from the 2p shell by ω pulse with the same energy. Using the multi-configurational time-dependent Hartree-Fock method, we explore how Rabi coupling between subshells generates coherence between the corresponding photoelectron wave packets. Our ab initio calculations confirm the analytical results derived from the essential-states approach in [K. L. Ishikawa, K. C. Prince, and K. Ueda, J. Phys. Chem. A 127, 10638 (2023)], validating the theoretical predictions. Although we focus on the Ne 2p and 2s subshells, our approach is applicable to a broad range of systems exhibiting photoionization from multiple subshells. The laser parameters employed in our simulations are available in modern Free Electron Lasers (FELs), and we anticipate that this work could stimulate experimental investigations using FELs to study ion-photoelectron coherence and entanglement.