Two-photon double ionization of helium by chirped few-cycle attosecond pulses: From nonsequential to sequential regime

doi:10.1088/1674-1056/25/7/073202

Abstract

The two-photon double ionization (TPDI) dynamics of helium by chirped attosecond pulses are theoretically studied by solving the two-electron time-dependent Schrödinger equation in its full dimensions. We show that both the differential and the total double ionization probability can be significantly controlled by adjusting the chirp. The dependence of the TPDI on the chirp can be quite different for different photon energies, relying on the central photon energy being in the sequential region, nonsequential region, or translation region. The physics which lead to the chirp dependence for different photon energies are addressed. Present findings are well reproduced by a model based on the second-order time-dependent perturbation theory.

Keywords: time-dependent Schrö dinger equation (TDSE), double ionization, electron correlation, chirp

Received: 26 February 2016
Revised: 09 May 2016
Accepted manuscript online:

PACS:	32.80.Rm	(Multiphoton ionization and excitation to highly excited states)
	42.50.Hz	(Strong-field excitation of optical transitions in quantum systems; multiphoton processes; dynamic Stark shift)
	42.65.Re	(Ultrafast processes; optical pulse generation and pulse compression)

Fund:

Project supported by the National Natural Science Foundation of China (Grant Nos. 11322437 and 11574010) and the National Basic Research Project of China (Grant No. 2013CB922402).

Corresponding Authors: Liang-You Peng
E-mail: liangyou.peng@pku.edu.cn

Cite this article:

Yao Tong(童瑶), Wei-Chao Jiang(姜维超), Pan Wu(伍攀), Liang-You Peng(彭良友) Two-photon double ionization of helium by chirped few-cycle attosecond pulses: From nonsequential to sequential regime 2016 Chin. Phys. B 25 073202

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Two-photon double ionization of helium by chirped few-cycle attosecond pulses: From nonsequential to sequential regime

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