Coherent imaging of an attosecond electron wave packet
Coherent imaging of an attosecond electron wave packet
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DOI：
10.1126/science.aam8393
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发表时间：
2017-06
期刊：
影响因子：
56.9
通讯作者：
D. Villeneuve;P. Hockett;M. Vrakking;H. Niikura
中科院分区：
文献类型：
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作者：
D. Villeneuve;P. Hockett;M. Vrakking;H. Niikura
当电子从氖原子中被排出时，阿秒脉冲成像量子力学节点结构。当一束光从原子中射出一个电子时，随后对两个带电粒子的探测掩盖了大量断断续续的量子力学复杂性。Villeneuve等人提供了一个引人注目的电子波状特性，就像它从氖中出现一样，由两个光子从阿秒脉冲序列在强红外场中驱逐。相位分布表现为f波的特征三节点结构，强场的斯塔克位移似乎选择了单个磁量子数为0的f波。科学，本期第1150页通过光电离从原子或分子中分离出来的电子携带着关于它们起源的量子态以及它们被释放到的连续态的信息。通常，光电子动量分布由角动量分量的相干和组成，每个角动量分量都有振幅和相位。在这里，我们展示了，通过氖的光电离，与红外激光场同步的一列阿秒脉冲可以用来解开这些角动量分量。双色双光子电离通过斯塔克移中间态产生几乎纯的f波，其磁量子数为零。干涉的f波与球对称的s波提供了一个全息参考，使相位分辨成像的f波。
Attosecond pulses image the quantum mechanical nodal structure as an electron is expelled from a neon atom. A detailed look at an electron's exit When a burst of light ejects an electron from an atom, the later detection of two charged particles masks a great deal of intermittent quantum mechanical complexity. Villeneuve et al. provide a striking look at the wavelike properties of the electron just as it emerges from neon, expelled by two photons from an attosecond pulse train in a strong infrared field. The phase distribution displays the characteristic three-node structure of an f-wave, which the Stark shift from the strong field appears to select with a single magnetic quantum number of 0. Science, this issue p. 1150 Electrons detached from atoms or molecules by photoionization carry information about the quantum state from which they originate, as well as the continuum states into which they are released. Generally, the photoelectron momentum distribution is composed of a coherent sum of angular momentum components, each with an amplitude and phase. Here we show, by using photoionization of neon, that a train of attosecond pulses synchronized with an infrared laser field can be used to disentangle these angular momentum components. Two-color, two-photon ionization via a Stark-shifted intermediate state creates an almost pure f-wave with a magnetic quantum number of zero. Interference of the f-wave with a spherically symmetric s-wave provides a holographic reference that enables phase-resolved imaging of the f-wave.