Comparative study of strong-field ionization of alkaline-earth-metal atoms
Autor: | ZhiYang Lin, Shi Chen, Jing Chen, Ya Cheng, Wei Chu, HuiPeng Kang, XiaoJun Liu, Zhizhan Xu, Jinping Yao, Wei Quan |
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Rok vydání: | 2020 |
Předmět: |
Physics
Alkaline earth metal Range (particle radiation) Work (thermodynamics) Laser 01 natural sciences 010305 fluids & plasmas law.invention Wavelength law Ionization 0103 physical sciences Femtosecond Physics::Atomic and Molecular Clusters Physics::Atomic Physics Atomic physics 010306 general physics Saturation (chemistry) |
Zdroj: | Physical Review A. 101 |
ISSN: | 2469-9934 2469-9926 |
Popis: | We report on a comparative study of strong-field ionization of alkaline-earth-metal atoms by intense femtosecond laser pulses from near-infrared to midinfrared wavelengths. By collecting the ionization signals only produced within the central portion of the laser focus, the focus volume effect is largely reduced and the saturation intensities for different alkaline-earth-metal atoms are reliably determined, which permits us to directly test the strong-field-ionization theories. We demonstrate that the Perelomov-Popov-Terent'ev model accurately predicts the experimental ionization yields and saturation intensities in general for arbitrary values of the Keldysh parameter, while the Ammosov-Delone-Krainov simulations agree with the experiments for the tunneling-ionization regime and also for the regime when the Keldysh parameter is around 1. Our work presents benchmark data for strong-field ionization of alkaline-earth metals over a broad range of laser parameters and confirms the validity of Keldysh's picture for such atoms. |
Databáze: | OpenAIRE |
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