【摘要】 已有的强激光诱导自电离理论都未考虑二阶离化过程,而本文则详细研究了这种相干弛豫机制对光电子谱等的影响。结果表明,在以往文献讨论的光强范围内,许多物理性质将因此发生重要改变:(1)在某些条件下,谱线变窄(line-narrowing)效应会消失;(2)原有的光电子峰大为消弱;(3)与最新的多光子电离实验结果一致,高阶光电子谱峰随光强的提高急剧增强,在足够强的光场下将起主导作用。更多还原

【Abstract】 We investigate in detail the influence of second-order ionization processes on the photo-electron spectrum etc., which has been ignored previously in the study of intense laser-field induced autoionization. It is found that, in the region of laser intensity currently discussed in literature, many physical features are altered significantly. (1) Under certain conditions, line-narrowing effect disappears. (2) The olignal photoelectron peaks are greatly reduced. (3) In agreement with the most recent experimental findings on multiphoton ionization, high-order photoelectron peaks drastically increase with increasing laser intensity, and they dominate the original peaks for sufficiently high Intensities.更多还原