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arXiv 2103.13703physics.atom-phphysics.optics
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用光电子动量分布的不对称性表征极性分子的亚循环电子动力学

Characterizing Sub-Cycle Electron Dynamics of Polar Molecules by Asymmetry in Photoelectron Momentum Distributions

Jia-Yin Che, Chao Chen, Shang Wang, Guo-Guo Xin, Yan-Jun Chen

摘要:

极性分子的强场电离包含着丰富的动力学过程,如隧穿、激发、斯塔克位移等。这些过程发生在子周期时间尺度上,并且在超快测量中难以区分。在这里,与一个发达的强场模型,同时考虑库仑和永久偶极子的影响,我们表明,光电子动量分布(PMD)在正交双色激光场可以用来解决这些过程与阿秒尺度的分辨率。得到了与偏振模色散非对称性有关的特征量,利用该特征量表征了极性分子在每半个激光周期内的复杂电子动力学行为,并确定了电子从极性分子不同侧面逃逸的细微时间差。

英文摘要:

Strong-field ionization of polar molecules contains rich dynamical processes such as tunneling, excitation, and Stark shift. These processes occur on a sub-cycle time scale and are difficult to distinguish in ultrafast measurements. Here, with a developed strong-field model considering effects of both Coulomb and permanent dipole, we show that photoelectron momentum distributions (PMDs) in orthogonal two-color laser fields can be utilized to resolve these processes with attosecond-scale resolution. A feature quantity related to the asymmetry in PMDs is obtained, with which the complex electron dynamics of polar molecules in each half laser cycle is characterized and the subtle time difference when electrons escaping from different sides of the polar molecule is identified.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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