氦原子双电子光电发射的时间分析
Timing analysis of two-electron photoemission
AI总结：
本研究通过求解薛定谔方程和复双光电离幅度导数，揭示了氦原子双电子光电发射的显著延迟现象，并推动了相关阿秒 streaking 实验的发展。
摘要：
我们预测了氦原子在吸收一个阿秒XUV脉冲后双电子光电发射出现显著延迟。我们通过求解时间依赖的薛定谔方程，并随后追踪无场演化双电子波包来建立这种延迟。这种延迟也可以与复双光电离（DPI）幅度相位的能量导数相关联，我们通过收敛的近耦方法评估了该导数。我们的观察促使未来针对氦原子DPI的阿秒 streaking 实验，这些实验可以阐明这一强相关离子化过程的各种机制。
英文摘要：
We predict a significant delay of two-electron photoemission from the helium atom after absorption of an attosecond XUV pulse. We establish this delay by solving the time dependent Schrödinger equation and by subsequent tracing the field-free evolution of the two-electron wave packet. This delay can also be related to the energy derivative of the phase of the complex double photoionization (DPI) amplitude which we evaluate by the convergent close-coupling method. Our observations prompt future attosecond streaking experiments on DPI of He which can elucidate various mechanisms of this strongly correlated ionization process.
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