Double ionization of He by time-delayed attosecond pulses

作者：Jiang Wei Chao^*; Xiong Wei Hao; Zhu Tian Shun; Peng Liang You; Gong Qihuang

来源：Journal of Physics B: Atomic, Molecular and Optical Physics , 2014, 47(9): 091001.

DOI：10.1088/0953-4075/47/9/091001

• carrier-envelope phase
• attosecond pulse
• double ionization
• two-electron interference

As He is exposed to double attosecond pulses with a time delay, double ionization can proceed in several different pathways. Through ab initio simulations by the fully dimensional time-dependent Schrodinger equation, we find that interferences among different pathways in the sequential two-photon double ionization can lead to interesting grid-like patterns in the joint energy spectra of the two electrons. We show that not only these interference patterns, but also the total double ionization probability critically depends on the relative carrier-envelope phase (CEP) between the two attosecond pulses. Our findings are successfully explained by a model based on second-order time-dependent perturbation theory. The present study demonstrates the feasibility of CEP control of double ionization, and provides an alternative way to characterize the relative CEP of attosecond pulses.

• 出版日期2014-5-15
• 单位北京大学