Direct Visualization of Valence Electron Motion Using Strong-Field Photoelectron Holography
Direct Visualization of Valence Electron Motion Using Strong-Field Photoelectron Holography
复制标题
使用强场光电子全息术直接可视化价电子运动
DOI：
10.1103/physrevlett.120.133204
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发表时间：
2018-03-28
影响因子：
8.6
通讯作者：
Lu, Peixiang
中科院分区：
文献类型：
--
作者：
He, Mingrui;Li, Yang;Lu, Peixiang
观察分子中价电子在其内在时间尺度上的运动一直是阿秒科学的中心目标之一，它需要亚原子空间和阿秒时间分辨率的测量。强场隧穿电离中的时间分辨光电子全息术有望进入这一领域。然而，迄今为止，这仍然是一项具有挑战性的任务。在这里，我们揭示了价电子运动的信息是如何编码在全息图的光电子动量分布（PEMD），并开发了一种新的检索方法。作为示范，将其应用于通过求解含时薛定谔方程获得的原型分子H-2（+）的PEMD，阿秒电荷迁移直接可视化与皮米的空间和阿秒的时间分辨率。我们的方法代表了一种监测阿秒电荷迁移在更复杂的多原子和生物分子，这是在新兴的阿秒化学的中心任务之一的一般方法。
Watching the valence electron move in molecules on its intrinsic timescale has been one of the central goals of attosecond science and it requires measurements with subatomic spatial and attosecond temporal resolutions. The time-resolved photoelectron holography in strong-field tunneling ionization holds the promise to access this realm. However, it remains to be a challenging task hitherto. Here we reveal how the information of valence electron motion is encoded in the hologram of the photoelectron momentum distribution (PEMD) and develop a novel approach of retrieval. As a demonstration, applying it to the PEMDs obtained by solving the time-dependent Schrodinger equation for the prototypical molecule H-2(+), the attosecond charge migration is directly visualized with picometer spatial and attosecond temporal resolutions. Our method represents a general approach for monitoring attosecond charge migration in more complex polyatomic and biological molecules, which is one of the central tasks in the newly emerging attosecond chemistry.