Subcycle electron emission in sequential double ionization by elliptical laser pulses
Ai-Hong Tong (童爱红)1,*(),Ying-Bin Li (李盈傧)2
1. Department of Physics and Mechanical & Electrical Engineering, Hubei University of Education, Wuhan 430205, China 2. National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing 210093, China
Using a classical ensemble method, we have investigated sequential double ionization (SDI) of Ar atoms driven by elliptical laser pulses. The results show that the ion momentum distribution of the Ar atoms depends strongly on the pulse duration. As the pulse duration increases, the ion momentum distribution changes from two bands to four bands and then to six bands and finally to an eight-band structure. Back analysis of double ionization trajectories shows that the variation of the band structure originates from pulse duration dependent multiple ionization bursts of the second electron. Our calculations indicate that the subcycle electron emission in the SDI could be more easily accessed by using elliptical laser pulses with a longer wavelength. Moreover, we show that there is good correspondence between the scaled radial momentum and the ionization time.
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