石墨中的阿秒色散软X射线吸收精细结构谱
Attosecond dispersive soft X-ray absorption fine structure spectroscopy in graphite
摘要：
固体的相变和分子的结构转变是重要的光诱导过程的典型例子，由于我们不能实时地将电子激发与原子位置相关联，其潜在机制在很大程度上难以理解。在这里，我们提出了一个决定性的一步，这种新的方法的基础上，水窗口覆盖（284 eV至543 eV）阿秒软X射线脉冲，可以同时访问电子和晶格参数，通过色散X射线吸收精细结构（XAFS）光谱。我们验证了attoXAFS与识别的σ* 和π* 轨道的状态密度的贡献，同时在石墨的晶格的四个特征键距。这项工作展示了attoXAFS的概念，作为一个强大的实时调查工具，这是同样适用于气体，液体和凝聚相。
英文摘要：
Phase transitions of solids and structural transformations of molecules are canonical examples of important photo-induced processes, whose underlying mechanisms largely elude our comprehension due to our inability to correlate electronic excitation with atomic position in real time. Here, we present a decisive step towards such new methodology based on water-window-covering (284 eV to 543 eV) attosecond soft X-ray pulses that can simultaneously access electronic and lattice parameters via dispersive X-ray absorption fine-structure (XAFS) spectroscopy. We validate attoXAFS with an identification of the σ* and π* orbital contributions to the density of states in graphite simultaneously with its lattice's four characteristic bonding distances. This work demonstrates the concept of attoXAFS as a powerful real-time investigative tool which is equally applicable to gas-, liquid- and condensed phase.
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