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arXiv 2102.06040physics.chem-phphysics.atm-clusquant-ph
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包含核自由度的电子衰变过程光谱

Electronic decay process spectra including nuclear degrees of freedom

Alexander Riegel, Elke Fasshauer

AI总结:

本文扩展电子衰变光谱理论,在 Born-Oppenheimer 近似下纳入核自由度,解释振动束缚态导致的峰形与干涉特征。

摘要:

在化学领域中,核运动历来是研究焦点,而我们现在探索跨越阿秒到飞秒的超快速电子运动,并证明它同样是该学科不可或缺且密切相关的组成部分。超短阿秒脉冲技术的出现,革新了我们直接观察原子和分子中电子重排的能力,为这些快速过程提供了时间分辨的认识。突出例子包括 Auger-Meitner 衰变和粒子间库仑衰变(Interparticle Coulombic Decay,ICD)。然而,真正的挑战在于解释这些观测结果,而理论模型在其中不可或缺。在 Phys. Rev. A 101, 043414 (2020) 所提出分析框架的基础上——该框架从纯电子视角分析了电子衰变过程中发射电子的光谱——本文实现了重要推进。我们将这一理论基础扩展以纳入核动力学,利用 Born-Oppenheimer 近似来深化对这些过程中电子运动与核运动之间复杂相互作用的理解。我们通过若干理论案例说明纳入核自由度所产生的影响,这些案例的特征是电子共振态和电子末态中具有不同数量的振动束缚态。该方法不仅阐明了复杂光谱特征和异常峰形,还展示了一种通过多个振动共振态独特的干涉图样提取其能量差的方法。

英文摘要:

In the field of chemistry, where nuclear motion has traditionally been a focal point, we now explore the ultra-rapid electronic motion spanning attoseconds to femtoseconds, demonstrating that it is equally integral and relevant to the discipline. The advent of ultrashort attosecond pulse technology has revolutionized our ability to directly observe electronic rearrangements in atoms and molecules, offering a time-resolved insight into these swift processes. Prominent examples include Auger-Meitner decay and Interparticle Coulombic Decay (ICD). However, the real challenge lies in interpreting these observations, where theoretical models are indispensable. Building upon the analytical framework introduced in Phys. Rev. A 101, 043414 (2020), which analyzed the spectra of electrons emitted during electronic decay processes from a purely electronic perspective, our paper represents a significant advancement. We extend this theoretical base to include nuclear dynamics, utilizing the Born-Oppenheimer approximation to deepen our understanding of the intricate interaction between electronic and nuclear motion in these processes. We illustrate the impact of incorporating nuclear degrees of freedom in several theoretical cases characterized by different numbers of vibrational bound states in both the electronic resonance and the electronic final state. This approach not only clarifies complex spectral features and unusual peak shapes but also demonstrates a method for extracting the energy differences between multiple vibrational resonance states through their distinctive interference patterns.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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