正交双色场中H₂⁺的量子动力学
Quantum Dynamics of $H_2^+$ in Orthogonal Two-Color Fields
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中文总结 AI 辅助
研究强正交激光场驱动H₂⁺离解电离，通过全维量子模拟，发现KER谱有新高能峰，其产率可通过改变垂直场分量的相对载波包络相位控制，揭示了多通道动力学及场对碎片角分布的影响，为控制超快电子 - 核动力学提供新自由度。
中文摘要 AI 辅助
我们展示了由强正交激光场驱动的H₂⁺离解电离的全维量子模拟。考虑了等频率正交分量，其根据相对相位和幅度产生椭圆或圆偏振，以及正交的800纳米和400纳米双色场。这些二维场强烈改变了碎片化动力学。最显著的是，在质子动能释放（KER）光谱中约4 - 5电子伏特处发现了一个高能峰，而相应的单色线性偏振计算中没有。通过改变垂直场分量的相对载波包络相位可以相干控制该峰的产率。垂直场还扰乱了在主要的3 - 3.5电子伏特离解通道中观察到的清晰的电子 - 质子能量共享模式，表明更复杂的多通道动力学。时间相关的状态投影和从单个激发态开始的计算将额外的峰归因于激光诱导的H₂⁺振动激发。此外，垂直场旋转了碎片角分布，使最可能的质子和电子发射方向大大偏离主z轴。这些发现表明正交激光场的空间和时间几何为控制超快电子 - 核动力学提供了额外的自由度。
英文摘要
We present full-dimensional quantum simulations of $H_2^+$ dissociative ionization driven by strong orthogonal laser fields. We consider equal-frequency orthogonal components, which generate elliptical or circular polarization depending on their relative phase and amplitude, as well as orthogonal $800$- and $400$-nm two-color fields. These two-dimensional fields strongly modify the fragmentation dynamics. Most notably, we identify a high-energy peak in the proton kinetic-energy-release (KER) spectrum at approximately $4-5$ eV that is absent from the corresponding single-color, linearly polarized calculations. The yield of this peak can be coherently controlled by varying the relative carrier-envelope phase of the perpendicular field component. The perpendicular field also disrupts the clear electron-proton energy-sharing pattern observed in the main $3-3.5$ eV dissociation channel, indicating more complex multichannel dynamics. Time-dependent state projections and calculations initiated from individual excited states attribute the additional peak to laser-induced vibrational excitation of $H_2^+$. Furthermore, the perpendicular field rotates the fragment angular distributions, causing the most probable proton and electron emission directions to deviate substantially from the principal $z$ axis. These findings demonstrate that the spatial and temporal geometry of orthogonal laser fields provides an additional degree of freedom for controlling ultrafast electron-nuclear dynamics.
