长脉冲激光场中H原子的阈上电离的理论研究

发布时间：2018-08-07 19:47

【摘要】：利用基于密度泛函理论下的窗算符技术求解含时薛定谔方程方法计算了H原子在长脉冲强激光场中能量谱,并与文献[8]中的动量空间的投影技术方法的计算结果进行了比较.在文献[8]给出的最大光电子能量范围内,我们的计算结果与文献[8]中的计算结果符合得很好,但是我们的计算结果能够给出比文献[8]中能量更高的光电子能谱,光电子能量谱的变化趋势也与实际的物理过程相符.同时我们也给出了最大光电子能量与激光强度关系的经验公式,利用我们的经验公式计算的最大光电子能量与经典计算预测的最大光电子能量符合得很好,这表明们的计算方法可靠,能够给出高精度的计算结果 .因此利用基于密度泛函理论下的窗算符方法能很好地用来研究H原子在长脉冲强激光场中的阈上电离的性质.
[Abstract]:The time-dependent Schrodinger equation is solved by using the window operator technique based on density functional theory. The energy spectrum of H atom in a long pulsed intense laser field is calculated and compared with the results obtained by the projection technique in momentum space in reference [8]. In the range of maximum photoelectron energy given in reference [8], our results agree well with those in reference [8], but our results can give a higher photoelectron energy spectrum than in [8]. The variation trend of photoelectron energy spectrum is also consistent with the actual physical process. At the same time, we also give the empirical formula of the relationship between the maximum photoelectron energy and the laser intensity. The maximum photoelectron energy calculated by our empirical formula is in good agreement with the maximum photoelectron energy predicted by the classical calculation. This shows that our calculation method is reliable and can give high precision calculation results. Therefore, the window-operator method based on density functional theory can be used to study the properties of H atom on threshold ionization in a long pulsed intense laser field.
【作者单位】：临沂大学物理与电子工程学院;临沂大学实验中心;
【基金】：国家自然科学基金(11247208) 山东省自然科学基金(ZR2010AQ025) 临沂大学博士启动基金(LYDX2013BS057,LYDX2013BS018)
【分类号】：O562.4

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