Chaotic ionization of a highly excited hydrogen atom in parallel electric and magnetic fields
Chaotic ionization of a highly excited hydrogen atom in parallel electric and magnetic fields
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DOI：
10.1088/0953-4075/40/10/025
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发表时间：
2007-05
期刊：
影响因子：
--
通讯作者：
T. Topcu;F. Robicheaux
中科院分区：
文献类型：
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作者：
T. Topcu;F. Robicheaux
我们提出了我们的模拟结果的电离氢原子激发到里德伯波包中存在的外部平行的电场和磁场。这是一个开放的量子系统的例子，其经典对应物已被证明在时域中显示混沌。在经典力学的框架内，电子通过混沌诱导的脉冲串逃逸。我们重现这种先前观察到的签名的经典混沌的时间依赖性电流的电离电子和研究的传出的脉冲串之间的干扰效应，这是不存在的经典图片。我们的尝试在操纵电离脉冲序列和核心散射耦合混沌电离的效果进行了讨论。我们进一步研究了作为系统的缩放能量的函数的混沌的发病。我们发现，相对较高的磁场，量子力学电离电流显示不规则的波动与经典电流，显示过渡到规则性。我们的结论是，振荡的结果从电离通道的数目减少较高的磁场强度。我们进一步研究了含时自相关函数及其傅里叶变换，以寻找光吸收谱中的朗道量子化效应。我们的结果包括计算通过经典的轨道蒙特卡罗方法比较我们的非微扰量子力学的结果与潜在的混沌经典动力学。
We present results of our simulations of the ionization of a hydrogen atom excited to a Rydberg wave packet in the presence of external parallel electric and magnetic fields. This is an example of an open, quantum system whose classical counterpart has been shown to display chaos in the time domain. Within the framework of classical mechanics, electrons escape through chaos induced pulse trains. We reproduce such previously observed signatures of classical chaos in the time-dependent current of ionizing electrons and study the interference effects between the outgoing pulse trains which is absent in the classical picture. Our attempts at manipulating the ionization pulse trains and the effect of core scattering coupled with the chaotic ionization are also discussed. We further investigate the onset of chaos as a function of the scaled energy of the system. We find that for relatively high magnetic fields, quantum-mechanical ionization current shows erratic fluctuations in contrast with the classical current which shows transition to regularity. We conclude that the oscillations result from the decrease in the number of the ionization channels for the higher magnetic field strengths. We further study the time-dependent autocorrelation function and its Fourier transform to look for the effects of the Landau quantization in the photoabsorption spectrum. Our results include calculations via the classical trajectory Monte Carlo method to compare our non-perturbative quantum-mechanical results with the underlying chaotic classical dynamics.