Dynamic Interference Photoelectron Spectra in Double Ionization: Numerical Simulation of 1D Helium
Fu Sun**, Dong Wei, Gui-Zhong Zhang, Xin Ding, Jian-Quan Yao
College of Precision Instrument and Optoelectronics Engineering, Key Lab of Optoelectronic Information Technology (Ministry of Education), Tianjin University, Tianjin 300072
Abstract：We report our numerical simulation on the dynamic interference photoelectron spectra for a one-dimensional (1D) He model exposed to intense ultrashort extreme ultraviolet (XUV) laser pulses. The results demonstrate an unambiguous interference feature in the photoelectron spectra, and the interference is unveiled to originate from the dynamic Stark effect. The interference photoelectron spectra are prompted for intense sub-femtosecond XUV laser pulses in double ionization. The stationary phase picture is corroborated qualitatively in the two-electron system. The ability of probing the dynamic Stark effect by the photoelectron spectra in a pragmatic experiment of single-photon double ionization of He may shed light on further investigation on multi-electron atoms and molecules.
2016, Vol. 33 
