Ahmadi H, Plésiat E, Moioli M, Frassetto F, Poletto L, Decleva P, Schröter C D, Pfeifer T, Moshammer R, Palacios A, Martin F, Sansone G
Physikalisches Institut, Albert-Ludwigs-Universität, Stefan-Meier-Straße 19, 79104, Freiburg, Germany.
Dipartimento di Fisica, Politecnico di Milano, Piazza Leonardo da Vinci 32, 20133, Milano, Italy.
Nat Commun. 2022 Mar 10;13(1):1242. doi: 10.1038/s41467-022-28783-x.
Photoionisation time delays carry structural and dynamical information on the target system, including electronic correlation effects in atoms and molecules and electron transport properties at interfaces. In molecules, the electrostatic potential experienced by an outgoing electron depends on the emission direction, which should thus lead to anisotropic time delays. To isolate this effect, information on the orientation of the molecule at the photoionisation instant is required. Here we show how attosecond time delays reflect the anisotropic molecular potential landscape in CF molecules. The variations in the measured delays can be directly related to the different heights of the potential barriers that the outgoing electrons see in the vicinity of shape resonances. Our results indicate the possibility to investigate the spatial characteristics of the molecular potential by mapping attosecond photoionisation time delays in the recoil-frame.
光致电离时间延迟携带了目标系统的结构和动力学信息，包括原子和分子中的电子关联效应以及界面处的电子传输特性。在分子中，出射电子所经历的静电势取决于发射方向，因此这应该会导致各向异性的时间延迟。为了分离这种效应，需要有关分子在光致电离瞬间取向的信息。在此我们展示了阿秒时间延迟如何反映CF分子中各向异性的分子势能面。测量到的延迟变化可以直接与出射电子在形状共振附近所看到的势垒的不同高度相关联。我们的结果表明，通过在反冲框架中绘制阿秒光致电离时间延迟来研究分子势的空间特征是有可能的。
