Attoclock is a powerful technique to resolve laser-driven electron dynamics on an attosecond timescale. Previously, it was mainly limited to atomic targets. Here we apply the attoclock technique to aligned molecules to study the subcycle ionization dynamics. By controlling the alignment of the molecule relative to the major axis of a strong elliptically polarized laser field, we demonstrate that the electron ionization time in aligned molecules can be precisely resolved by the attoclock technique. We find that the ionization time corresponding to the peak of the photoelectron momentum distribution shifts several tens of attosecond relative to the laser field peak depending on the molecular orientation and molecular orbital structure. A significant difference between the measurement and molecular Ammosov-Delone-Krainov model is found. We further show that the photoelectron ionization time of molecules is sensitive to angular-dependent ionization rate, opening up opportunities for probing attosecond electron dynamics in complex polyatomic molecules.

中文翻译：

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亚秒角条纹记录的取向分子的光电子电离时间

Attoclock是一项强大的技术，可以解决在一秒级的激光驱动电子动力学问题。以前，它主要限于原子目标。在这里，我们将attoclock技术应用于对齐的分子，以研究亚周期电离动力学。通过控制分子相对于强椭圆偏振激光场的主轴的排列，我们证明了排列分子中的电子电离时间可以通过原子钟技术精确解析。我们发现，取决于分子取向和分子轨道结构，与光电子动量分布的峰值相对应的电离时间相对于激光场峰值偏移了几十个阿秒。发现测量与分子Ammosov-Delone-Krainov模型之间存在显着差异。