Charge resonance enhanced ionization of oxygen molecule in intense laser field

IF 2.3 3区物理与天体物理 Q2 PHYSICS, MULTIDISCIPLINARY

Physics Letters A Pub Date : 2025-02-22 DOI:10.1016/j.physleta.2025.130348

Yun Wang, Guoqiang Shi, Yingbo Shi, Zexuan Wang, Shaohua Sun, Zuoye Liu

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Abstract

The charge resonance enhanced ionization (CREI) phenomenon of O₂ is induced by a femtosecond laser field. We measure the time-of-flight spectra of O⁺ as a function of time delay and find a new structure in the O⁺ spectrum at a delay of 60 fs. Based on the kinetic energy release of the O⁺ and motion time of the O₂⁺wavepacket, the CREI process can be divided into two steps. Firstly, O₂ is ionized to the a⁴Π_u of O₂⁺, the coupling between the a⁴Π_u and f⁴Π_g happens by the pump pulse, and then the nuclear wavepacket continuously evolves on the f⁴Π_g state in the absence of laser field. Secondly, the probe pulse causes the CREI process between the f⁴Π_g(O₂⁺) and W³Δ_u(O₂²⁺) via the intermediate state 2⁴Π_g(O₂⁺). According to dissociation pathway, we utilize classical model to simulate the evolution time of O₂⁺, which is 57 fs, this is in good agreement with the experimental results.

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来源期刊

Physics Letters A 物理-物理：综合

CiteScore

5.10

自引率

3.80%

发文量

493

审稿时长

30 days

期刊介绍： Physics Letters A offers an exciting publication outlet for novel and frontier physics. It encourages the submission of new research on: condensed matter physics, theoretical physics, nonlinear science, statistical physics, mathematical and computational physics, general and cross-disciplinary physics (including foundations), atomic, molecular and cluster physics, plasma and fluid physics, optical physics, biological physics and nanoscience. No articles on High Energy and Nuclear Physics are published in Physics Letters A. The journal''s high standard and wide dissemination ensures a broad readership amongst the physics community. Rapid publication times and flexible length restrictions give Physics Letters A the edge over other journals in the field.