Trabattoni Andrea, Wiese Joss, De Giovannini Umberto, Olivieri Jean-François, Mullins Terry, Onvlee Jolijn, Son Sang-Kil, Frusteri Biagio, Rubio Angel, Trippel Sebastian, Küpper Jochen
Center for Free-Electron Laser Science, Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607, Hamburg, Germany.
The Hamburg Center for Ultrafast Imaging, Universität Hamburg, Luruper Chaussee 149, 22761, Hamburg, Germany.
Nat Commun. 2020 May 21;11(1):2546. doi: 10.1038/s41467-020-16270-0.
The interaction of strong laser fields with matter intrinsically provides a powerful tool for imaging transient dynamics with an extremely high spatiotemporal resolution. Here, we study strong-field ionisation of laser-aligned molecules, and show a full real-time picture of the photoelectron dynamics in the combined action of the laser field and the molecular interaction. We demonstrate that the molecule has a dramatic impact on the overall strong-field dynamics: it sets the clock for the emission of electrons with a given rescattering kinetic energy. This result represents a benchmark for the seminal statements of molecular-frame strong-field physics and has strong impact on the interpretation of self-diffraction experiments. Furthermore, the resulting encoding of the time-energy relation in molecular-frame photoelectron momentum distributions shows the way of probing the molecular potential in real-time, and accessing a deeper understanding of electron transport during strong-field interactions.
强激光场与物质的相互作用本质上为以极高的时空分辨率成像瞬态动力学提供了一个强大的工具。在此，我们研究激光排列分子的强场电离，并展示了在激光场和分子相互作用的联合作用下光电子动力学的完整实时图像。我们证明分子对整体强场动力学有显著影响：它为具有给定再散射动能的电子发射设定了时钟。这一结果代表了分子框架强场物理学开创性论断的一个基准，对自衍射实验的解释有重大影响。此外，在分子框架光电子动量分布中产生的时间 - 能量关系编码展示了实时探测分子势以及更深入理解强场相互作用期间电子传输的方法。
