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arXiv 2005.09584physics.atom-ph
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Wigner时间延迟对$H_{2}$隧道电离的角度依赖性

Angular dependence of the Wigner time delay upon tunnel ionization of $H_{2}$

Daniel Trabert, Simon Brennecke, Kilian Fehre, Nils Anders, Angelina Geyer, Sven Grundmann, Markus S. Schöffler, Lothar Ph. H. Schmidt, Till Jahnke, Reinhard Dö… 展开作者

Daniel Trabert, Simon Brennecke, Kilian Fehre, Nils Anders, Angelina Geyer, Sven Grundmann, Markus S. Schöffler, Lothar Ph. H. Schmidt, Till Jahnke, Reinhard Dörner, Maksim Kunitski, Sebastian Eckart

摘要:

在光电效应被发现并在能量领域得到解释的100多年后,人们仍然在大量研究它的持续时间。光电子的发射时间可以通过维格纳时间延迟来量化。在过去的10年里,解决单光子电离的时间延迟的实验变得可行。到目前为止,还没有研究过的一个缺失部分是分子强场电离的维格纳时间延迟。在这里,我们显示的维格纳时间延迟的隧道电离的$H_{2}$分子的实验数据,并证明其依赖于相对于分子轴的电子的发射方向。我们发现,所观察到的维格纳时间延迟的变化可以定量地解释由电子的出生位置的空间移位后隧穿的延长/缩短的旅行路径的电子。这介绍了一个直观的角度对维格纳时间延迟在强场电离。

英文摘要:

More than 100 years after its discovery and its explanation in the energy domain, the duration of the photoelectric effect is still heavily studied. The emission time of a photoelectron can be quantified by the Wigner time delay. Experiments addressing this time delay for single-photon ionization became feasible during the last 10 years. A missing piece, which has not been studied, so far, is the Wigner time delay for strong-field ionization of molecules. Here we show experimental data on the Wigner time delay for tunnel ionization of $H_{2}$ molecules and demonstrate its dependence on the emission direction of the electron with respect to the molecular axis. We find, that the observed changes in the Wigner time delay can be quantitatively explained by elongated/shortened travel paths of the electrons that are due to spatial shifts of the electron's birth position after tunneling. This introduces an intuitive perspective towards the Wigner time delay in strong-field ionization.

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