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

• 作者: 伍攀 姜维超 彭良友 童瑶
• 来源期刊: 中国物理B（英文版）
• 关键词: time-dependent Schr ¨odinger equation (TDSE) double ionization electron correlation chirp
• 年，卷（期）: 2016,（7）
• 页码范围: 073202-1-073202-8
• 页数: 1页
• 语种: 英文
• DOI: 10.1088/1674-1056/25/7/073202

摘要

The two-photon double ionization (TPDI) dynamics of helium by chirped attosecond pulses are theoretically studied by solving the two-electron time-dependent Schr ¨odinger 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.