论文标题
分子中2D电荷分布的Attosend Metrology
Attosecond metrology of 2D charge distribution in molecules
论文作者
论文摘要
光电离作为半散射过程不是瞬时的。通常，光电离的时间延迟是几十个attoseconds（1 as = 10 $^{ - 18} $ s）的顺序。从单个原子到纳米对象时，人们可以期望延迟会增加，因为光电子散布在较大的距离上。在这里，我们表明这在平面系统的情况下不再有效。使用Attsond干涉法，我们发现与其3D钻石样的Adamantane相比，2D碳基分子中的时间延迟明显小得多。测得的时间延迟带有在残留分子阳离子中产生的孔的空间分布的特征，从而使我们能够以Angstrom精度获得其尺寸。我们的发现为跟踪和操纵分子材料的超快电荷运输提供了新的机会。
Photoionization as a half-scattering process is not instantaneous. Usually, time delays in photoionization are of the order of few tens of attoseconds (1 as = 10$^{-18}$ s). While going from a single atom to a nano-object, one can expect the delay to increase since the photoelectron scatters over a larger distance. Here, we show that this is no longer valid in the case of planar systems. Using attosecond interferometry, we find that the time delay in a 2D carbon-based molecule, naphthalene, is significantly smaller compared to its 3D diamond-like counterpart, adamantane. The measured time delay carries the signature of the spatial distribution of the hole created in the residual molecular cation, allowing us to obtain its dimensions with angstrom accuracy. Our findings offer novel opportunities for tracking and manipulating ultrafast charge transport in molecular materials.
