Attosecond dynamics through a Fano resonance: Monitoring the birth of a photoelectron
Attosecond dynamics through a Fano resonance: Monitoring the birth of a photoelectron
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DOI：
10.1126/science.aah5188
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发表时间：
2016-11-11
期刊：
影响因子：
56.9
通讯作者：
Salieres, P.
中科院分区：
文献类型：
--
作者：
Gruson, V.;Barreau, L.;Salieres, P.
量子系统的动力学被编码在波包的振幅和相位中。然而，阿秒尺度上电子动力学的快速性阻碍了电子波包在时域中的完整表征。使用光谱分辨电子干涉仪，我们能够测量通过氦气中法诺自电离共振产生的光电子波包的振幅和相位。在我们的设置中，通过双光子跃迁获得的复制品会干扰通过平滑连续体形成的参考波包，从而允许纯粹根据实验数据对连续体中释放的谐振波包进行全时间重建。反过来，这解决了阿秒时间尺度上自电离共振的积累。 Our results, in excellent agreement with ab initio time-dependent calculations, raise prospects for detailed investigations of ultrafast photoemission dynamics governed by electron correlation, as well as coherent control over structured electron wave packets.
The dynamics of quantum systems are encoded in the amplitude and phase of wave packets. However, the rapidity of electron dynamics on the attosecond scale has precluded the complete characterization of electron wave packets in the time domain. Using spectrally resolved electron interferometry, we were able to measure the amplitude and phase of a photoelectron wave packet created through a Fano autoionizing resonance in helium. In our setup, replicas obtained by two-photon transitions interfere with reference wave packets that are formed through smooth continua, allowing the full temporal reconstruction, purely from experimental data, of the resonant wave packet released in the continuum. In turn, this resolves the buildup of the autoionizing resonance on an attosecond time scale. Our results, in excellent agreement with ab initio time-dependent calculations, raise prospects for detailed investigations of ultrafast photoemission dynamics governed by electron correlation, as well as coherent control over structured electron wave packets.