Siegert-state expansion in the Kramers-Henneberger frame: Interference substructure of above-threshold ionization peaks in the stabilization regime
Siegert-state expansion in the Kramers-Henneberger frame: Interference substructure of above-threshold ionization peaks in the stabilization regime
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DOI：
10.1103/physreva.76.043418
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发表时间：
2007-10
影响因子：
2.9
通讯作者：
K. Toyota;O. Tolstikhin;T. Morishita;S. Watanabe
中科院分区：
文献类型：
--
作者：
K. Toyota;O. Tolstikhin;T. Morishita;S. Watanabe
接收于2007年7月12日;出版于2007年10月17日Siegert态展开方法被应用于Kramers-Henneberger框架中描述一维激光-原子相互作用模型问题的含时薛定谔方程的求解。我们的方法在数学上是严格的，数值上是精确的，即使考虑一个非常有限的空间盒，因为使用Siegert态作为展开的基础消除了来自盒边界的非物理反射，Kramers-Henneberger框架使我们能够充分考虑与激光场的相互作用。通过计算强高频激光脉冲产生的阈上电离谱，证明了该方法的有效性。我们发现了一个多光子峰的振荡子结构，它是由脉冲中不同时刻产生的光电子波包的干涉引起的，在稳定区尤为明显。根据高频Floquet理论给出了这种效应的解释。DOI：10.1103/PhysRevA.76.043418 PACS编号：32.80.Rm，31.15。p，31.70。Hq，34.10。X
Received 12 July 2007; published 17 October 2007The Siegert-state expansion approach is applied to the solution of the time-dependent Schrodinger equationdescribing a model one-dimensional laser-atom interaction problem in the Kramers-Henneberger frame. Ourmethod is mathematically rigorous and numerically exact even though a very restricted spatial box is consid-ered, since the use of Siegert states as a basis in the expansion eliminates unphysical reflections from theboundary of the box and the Kramers-Henneberger frame enables us to fully take the interaction with the laserfield into account. The method is demonstrated by calculations of above-threshold ionization spectra generatedby strong high-frequency laser pulses. We found an oscillating substructure of multiphoton peaks caused by aninterference of photoelectron wave packets produced at different times during the pulse which becomes espe-cially pronounced in the stabilization regime. An interpretation of this effect in terms of the high-frequencyFloquet theory is given.DOI: 10.1103/PhysRevA.76.043418 PACS number s : 32.80.Rm, 31.15. p, 31.70.Hq, 34.10. x