Attosecond tracing of correlated electron-emission in non-sequential double ionization
Attosecond tracing of correlated electron-emission in non-sequential double ionization
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DOI：
10.1038/ncomms1807
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发表时间：
2012-05-01
影响因子：
16.6
通讯作者：
Kling, Matthias F.
中科院分区：
文献类型：
--
作者：
Bergues, Boris;Kuebel, Matthias;Kling, Matthias F.
尽管它们对分子键合或化学反应等现象有广泛的影响，但我们对多电子动力学的了解有限，它们的理论建模仍然是一项最困难的任务。从实验方面来看，研究电子在相关时间尺度上的动态演化和相互作用是非常必要的，这些时间尺度延伸到阿秒范围。在这里，我们使用近单周期激光脉冲与明确定义的电场演变，以限制氩原子的双电离到一个单一的激光周期。测得的两个电子的动量谱，这与以前所有使用较长脉冲的实验中记录的谱有很大不同，使我们能够在亚飞秒时间尺度上追踪两个电子的相关发射。实验结果，这是讨论的半经典模型，提供了强有力的约束理论的发展，并导致我们修改共同的假设机制，管理双电离。
Despite their broad implications for phenomena such as molecular bonding or chemical reactions, our knowledge of multi-electron dynamics is limited and their theoretical modelling remains a most difficult task. From the experimental side, it is highly desirable to study the dynamical evolution and interaction of the electrons over the relevant timescales, which extend into the attosecond regime. Here we use near-single-cycle laser pulses with well-defined electric field evolution to confine the double ionization of argon atoms to a single laser cycle. The measured two-electron momentum spectra, which substantially differ from spectra recorded in all previous experiments using longer pulses, allow us to trace the correlated emission of the two electrons on sub-femtosecond timescales. The experimental results, which are discussed in terms of a semiclassical model, provide strong constraints for the development of theories and lead us to revise common assumptions about the mechanism that governs double ionization.