Barreau Lou, Petersson C Leon M, Klinker Markus, Camper Antoine, Marante Carlos, Gorman Timothy, Kiesewetter Dietrich, Argenti Luca, Agostini Pierre, González-Vázquez Jesús, Salières Pascal, DiMauro Louis F, Martín Fernando
LIDYL, CEA, CNRS, and Université Paris-Saclay, 91191 Gif-sur-Yvette, France.
Departamento de Química, Módulo 13, Universidad Autónoma de Madrid, 28049 Madrid, Spain.
Phys Rev Lett. 2019 Jun 28;122(25):253203. doi: 10.1103/PhysRevLett.122.253203.
We have determined spectral phases of Ne autoionizing states from extreme ultraviolet and midinfrared attosecond interferometric measurements and ab initio full-electron time-dependent theoretical calculations in an energy interval where several of these states are coherently populated. The retrieved phases exhibit a complex behavior as a function of photon energy, which is the consequence of the interference between paths involving various resonances. In spite of this complexity, we show that phases for individual resonances can still be obtained from experiment by using an extension of the Fano model of atomic resonances. As simultaneous excitation of several resonances is a common scenario in many-electron systems, the present work paves the way to reconstruct electron wave packets coherently generated by attosecond pulses in systems larger than helium.
我们通过极紫外和中红外阿秒干涉测量以及从头算全电子含时理论计算，在多个自电离态被相干填充的能量区间内，确定了氖自电离态的光谱相位。所检索到的相位呈现出随光子能量的复杂行为，这是涉及各种共振的路径之间干涉的结果。尽管存在这种复杂性，但我们表明，通过扩展原子共振的法诺模型，仍可从实验中获得各个共振的相位。由于在多电子系统中同时激发多个共振是常见情况，本工作为在比氦更大的系统中重建由阿秒脉冲相干产生的电子波包铺平了道路。
