Atomic Physics, Fysikum, Stockholm University, AlbaNova University Center, SE-106 91 Stockholm, Sweden.
Phys Rev Lett. 2010 Jul 30;105(5):053002. doi: 10.1103/PhysRevLett.105.053002. Epub 2010 Jul 27.
We investigate the possibility to monitor the dynamics of autoionizing states in real-time and control the yields of different ionization channels in helium by simulating extreme ultraviolet (XUV) pump IR-probe experiments focused on the N=2 threshold. The XUV pulse creates a coherent superposition of doubly excited states which is found to decay by ejecting electrons in bursts. Prominent interference fringes in the photoelectron angular distribution of the 2s and 2p ionization channels are observed, along with significant out-of-phase quantum beats in the yields of the corresponding parent ions.
我们研究了通过模拟聚焦在 N=2 阈值的极紫外（XUV）泵浦 IR 探测实验，实时监测自电离态动力学并控制氦中不同电离通道产额的可能性。XUV 脉冲创建了一个双激发态的相干叠加，该叠加通过突发方式逐出电子而衰减。在 2s 和 2p 电离通道的光电子角分布中观察到明显的干涉条纹，以及相应母离子产额的显著异相量子拍频。
