论文标题
$ h_ {2} $的隧道电离时的Wigner时间延迟的角度依赖性
Angular dependence of the Wigner time delay upon tunnel ionization of $H_{2}$
论文作者
论文摘要
在发现并在能源领域的解释之后100多年，仍然对光电效应的持续时间进行了大量研究。光电子的发射时间可以通过WIGNER时间延迟来量化。在过去的10年中，解决单光子电离的这段时间延迟的实验变得可行。到目前为止，尚未研究的缺失物品是分子强场电离的较高时间延迟。在这里，我们显示了有关$ H_ {2} $分子隧道电离的WIGNER时间延迟的实验数据，并证明了其依赖于电子相对于分子轴的发射方向。我们发现，观察到的WIGNER时间延迟的变化可以通过电子在隧道后电子出生位置的空间移动而定量解释。这引入了对强场电离的Wigner时间延迟的直观观点。
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.
