论文标题
分子光电离
Zeptosecond Birth Time Delay in Molecular Photoionization
论文作者
论文摘要
光离子化是光子吸收引发电子逃逸的基本光 - 物质相互作用过程之一。该过程的时间尺度提出了许多开放问题。实验发现了来自不同轨道，电子频段或不同方向的电子射出之间的attosecond（$ 10^{ - 18} $ s）域中的时间延迟。在这里，我们证明了在分子轨道上没有同时发射电子。出生时间取决于光子在整个分子上的旅行时间，即h $ _2 $的平均债券长度的247个Zeptseconds（$ 10^{ - 21} $ S）。使用电子干涉技术，我们解决了从氢分子的两个中心发射之间的出生时间延迟。
Photoionization is one of the fundamental light-matter interaction processes in which the absorption of a photon launches the escape of an electron. The time scale of the process poses many open questions. Experiments found time delays in the attosecond ($10^{-18}$ s) domain between electron ejection from different orbitals, electronic bands, or in different directions. Here, we demonstrate that across a molecular orbital the electron is not launched at the same time. The birth time rather depends on the travel time of the photon across the molecule, which is 247 zeptoseconds ($10^{-21}$ s) for the average bond length of H$_2$. Using an electron interferometric technique, we resolve this birth time delay between electron emission from the two centers of the hydrogen molecule.
