标题： 碘代烷的光电子能谱时间分辨技术 显示英文标题

标题： Photoemission Chronoscopy of the Iodoalkanes

摘要： 飞秒光电子发射中的时间延迟在阿托秒量级，并已在原子、分子和固体中被实验确定。 它们的大小和能量依赖性有望为所测量系统的性质提供基本的见解。 在最近的一项研究中，Biswas \textsl{等.} (Biswas, S., Förg, B., Ortmann, L. et al. 通过光电子发射时间延迟探测分子环境。 Nat. Phys. 16, 778-783 (2020)) 通过阿托秒条纹光谱学确定了碘乙烷中 I$4d$能级的绝对光电子发射时间，发现功能基团的存在会增加光电子发射时间延迟，这表明基于半经典计算，功能基团的大小与时间延迟之间存在相关性。 在这里，我们实验研究了碘烷中功能基团对 I$4d$光电子发射时间的影响，从碘甲烷到2-碘丁烷，在 I$4d\to\varepsilon f$光电子发射通道中的巨共振区域的三个光子能量下进行研究，发现仅存在功能基团并不一定会增加光电子发射延迟，并且总体而言无法建立其大小与光电子发射时间延迟之间的明显相关性。 显示英文摘要

摘要： Time delays in photoemission are on the order of attoseconds and have been experimentally determined in atoms, molecules and solids. Their magnitude and energy dependence are expected to yield fundamental insights into the properties of the systems in which they're measured. In a recent study Biswas \textsl{et al.} (Biswas, S., F\"org, B., Ortmann, L. et al. Probing molecular environment through photoemission delays. Nat. Phys. 16, 778-783 (2020)) determined the absolute photoemission time of the I$4d$ level in iodoethane via attosecond streaking spectroscopy, finding the presence of a functional group to increase the photoemission time delay, suggesting a correlation between the size of the functional group and time delay based on a semi-classical calculation. Here we experimentally study the dependence of the I$4d$ photoemission time on the functional group in the iodoalkanes from iodomethane up to 2-iodobutane at three photon energies across the giant resonance in the I$4d\to\varepsilon f$ photoemission channel, finding that the presence alone of a functional group does not necessarily increase the photoemission delay, and that overall no clear correlation between its size and the photoemission time delay can be established.