Vibronic coupling effects in resonant auger spectra of H2O.

Vibronic coupling effects in resonant auger spectra of H2O.
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H2O 共振俄歇光谱中的电子振动耦合效应

DOI:
10.1021/jp304666k
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发表时间:
--
期刊:
The journal of physical chemistry. A
影响因子:
--
通讯作者:
H.-D. Meyer
H.-D. Meyer
中科院分区:
--
文献类型:
--
作者:
M. Eroms;M. Jungen;H.-D. Meyer

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我们提出了一个理论研究的共振俄歇效应在气相水。在我们早期的工作中,核动力学的模拟被处理在一个一步的图片,因为激发和衰变事件不能被解开。扩展这个框架,我们现在占的阳离子最终状态所产生的退化在其势能面(PES)的电子振动耦合。一个diabatization的阳离子状态允许一个正确的治疗非玻恩-奥本海默动力学导致显着更好的协议与实验结果。此外,我们到达一个更平衡的理解的各种光谱特征,可以归因于核运动的核心激发态或振动耦合效应。用多组态含时Hartree方法求解了核运动方程。使用耦合电子对方法(CEPA),而以前的多参考配置相互作用方法已被采用的阳离子PES重新计算。
We present a theoretical investigation of the resonant Auger effect in gas-phase water. As in our earlier work, the simulation of nuclear dynamics is treated in a one-step picture, because excitation and decay events cannot be disentangled. Extending this framework, we now account for the vibronic coupling in the cationic final states arising from degeneracies in their potential energy surfaces (PESs). A diabatization of the cationic states permits a correct treatment of non Born–Oppenheimer dynamics leading to a significantly better agreement with experimental results. Moreover, we arrive at a more balanced understanding of the various spectral features that can be attributed to nuclear motion in the core-excited state or to vibronic coupling effects. The nuclear equations of motion have been solved using the multiconfiguration time-dependent Hartree (MCTDH) method. The cationic PESs were recalculated using the coupled electron pair approach (CEPA) whereas previously a multireference configuration interaction method had been employed.
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