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通过数值求解薛定谔方程并用“抓拍”(snapshot)的方式观测两电子动量分布,我们研究了超强超快激光场中原子发生非次序双电离的不同机制。我们的模拟表明“抓拍”过程中双电离波函数的选取范围对两电子动量分布图样的特征和分布范围等都有显著的影响。图样中这种由于不同的观测范围导致的明显区别直接地影响我们对非次序双电离动力学过程的分辨。为此本文即结合经典再散射三步模型,详细分析了“抓拍”过程中双电离波函数范围的选取,并深入讨论了不同的非次序双电离机制及其对应的动量分布的特征。本文的结果将给相关的实验研究提供有益的参考。 相似文献
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分子的轨道成像是科学研究中广为关注的主题。能否利用高次谐波来追踪化学反应的具体过程具有重要的实践意义,此外研究分子的轨道成像的理论基础还能够深化人们对原子的和分子的高次谐波辐射机制的理解。文章在简要回顾高次谐波研究历史的基础上,介绍了文章作者近期在利用高次谐波实现分子的轨道成像中的工作。文章作者通过数值地和解析地研究分子的高次谐波辐射的取向依赖检验了分子轨道成像的基本假设。研究显示,由于两中心干涉效应,高次谐波辐射过程中的分子的再碰撞电子波包与分子的价电子轨道的对称性和电离能密切相关。作为一个结果,分子的再碰撞电子波包的谱振幅可能和它的参考原子的再碰撞电子波包的谱振幅在某些能量区域显示很大的差别。这个发现对分子的轨道成像实验具有重要的意义。 相似文献
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To measure and control the electron motion in atoms and molecules by the strong laser field on the attosecond time scale is one of the research frontiers of atomic and molecular photophysics. It involves many new phenomena and processes and raises a series of questions of concepts, theories, and methods. Recent studies show that the Coulomb potential can cause the ionization time lag (about 100 attoseconds) between instants of the field maximum and the ionization-rate maximum. This lag can be understood as the response time of the electronic wave function to the strong-field-induced ionization event. It has a profound influence on the subsequent ultrafast dynamics of the ionized electron and can significantly change the time—frequency properties of electron trajectory (an important theoretical tool for attosecond measurement). Here, the research progress of response time and its implications on attosecond measurement are briefly introduced. 相似文献
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We study high-order harmonic generation(HHG) from multi-center asymmetric linear molecules numerically and analytically. Our simulations show that odd and even HHG spectra of the asymmetric multi-center system respond differently to the change of the molecular structure. Specifically, when the internuclear distances between these nuclei of the molecule have a small change, the odd spectra usually do not change basically, but the even spectra differ remarkably. Based on this phenomenon, a simple procedure is proposed to probe the positions of these nuclei with odd–even HHG. Our results shed light on attosecond probing of the structure of multi-center molecules using HHG. 相似文献
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