Collective-field-corrected strong field approximation for laser-irradiated metal clusters

Collective-field-corrected strong field approximation for laser-irradiated metal clusters
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激光照射金属团簇的集体场校正强场近似

DOI:
10.1088/0953-4075/47/12/124029
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发表时间:
2014
期刊:
Journal of Physics B: Atomic, Molecular and Optical Physics
影响因子:
--
通讯作者:
D. Bauer
D. Bauer
中科院分区:
--
文献类型:
--
作者:
Th. Keil;D. Bauer

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根据所谓的“量子轨道”制定的强场近似(SFA)使人们对强激光驱动的电离动力学有了更多的了解。在普通 SFA 中,发射的电子被视为单独激光场中的自由电子。然而,随着实验技术的改进和更先进的数值模拟,越来越明显的是,简单的 SFA 即使在定性水平上也错过了有趣的效果。例子有全息旁瓣、低能结构、低动能光电子光谱中的径向图案和强烈旋转的角分布。出于这个原因,最近人们越来越多地致力于 SFA 的库仑校正。在本文中,我们遵循类似的路线,但考虑金属簇的电离。众所周知,来自团簇的光电子比原子或小分子发射的光电子能量更高,特别是在引发膨胀团簇的米氏共振的情况下。我们开发了一个 SFA,通过简单的刚性球模型将集群内的集体场考虑在内。我们的方法基于场校正量子轨道,以便可以详细研究加速过程(或任何其他感兴趣的光谱特征)。
The strong field approximation (SFA) formulated in terms of so-called'quantum orbits' led to much insight into intense-laser driven ionization dynamics. In plain SFA, the emitted electron is treated as a free electron in the laser field alone. However, with improving experimental techniques and more advanced numerical simulations, it becomes more and more obvious that the plain SFA misses interesting effects even on a qualitative level. Examples are holographic side lobes, the low-energy structure, radial patterns in photoelectron spectra at low kinetic energies and strongly rotated angular distributions. For this reason, increasing efforts have been recently devoted to Coulomb corrections of the SFA. In the current paper, we follow a similar line but consider ionization of metal clusters. It is known that photoelectrons from clusters can be much more energetic than those emitted from atoms or small molecules, especially if the Mie resonance of the expanding cluster is evoked. We develop a SFA that takes the collective field inside the cluster via the simple rigid-sphere model into account. Our approach is based on field-corrected quantum orbits so that the acceleration process (or any other spectral feature of interest) can be investigated in detail.
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