离子势的长程作用对强场隧穿电离过程中的中性原子残存现象的影响研究

发布时间：2019-05-19 22:23

【摘要】：强场物理中中性原子的产生对于基础物理和应用物理有着很重要的应用.本文利用三维半经典模拟方法研究了线偏强激光场隧穿电离过程中离子势的长程作用对中性原子残存问题的影响.采用汤川势(Yukawa Potential)来刻画电子感受的势场,通过调节屏蔽系数可以连续地减小长程作用的影响.可以发现不同的屏蔽系数下残存中性原子稳定化频率基本不发生改变,只是中性原子的残存率会随着屏蔽系数的增大而降低.这说明离子势的长程作用会增加中性原子残存率,而基本不影响中性原子的稳定化频率.另外本文还研究了激光场的波长和场强对残存中性原子稳定化频率的影响.发现激光场波长越长,场强越大,残存中性原子的稳定化频率越低.
[Abstract]:The generation of neutral atoms in strong field physics is very important for basic physics and applied physics. In this paper, the effect of long-range interaction of ion potential on the residual problem of neutral atoms in the process of tunneling ionization in line polarized laser field is studied by using three-dimensional semiclassical simulation method. Tangchuan potential (Yukawa Potential) is used to depict the potential field of electron perception, and the influence of long-range action can be continuously reduced by adjusting the shielding coefficient. It can be found that the stabilization frequency of residual neutral atoms does not change under different shielding coefficients, but the residual rate of neutral atoms decreases with the increase of shielding coefficient. This shows that the long-range action of ion potential will increase the residual rate of neutral atoms, but basically does not affect the stabilization frequency of neutral atoms. In addition, the effects of the wavelength and field intensity of the laser field on the stabilization frequency of the remaining neutral atoms are also studied. It is found that the longer the wavelength of the laser field is, the greater the field strength is, and the lower the stabilization frequency of the remaining neutral atoms is.
【作者单位】：中国工程物理研究院北京研究生院;北京应用物理与计算数学研究所;北京大学应用物理与技术研究中心;
【基金】：国家自然科学基金资助项目(编号:11274051)
【分类号】：O562

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