Potential Energy Curves of Molecular Nitrogen for Singly and Doubly Ionized States with Core and Valence Holes.

Potential Energy Curves of Molecular Nitrogen for Singly and Doubly Ionized States with Core and Valence Holes.
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具有核心和价空穴的单电离态和双电离态氮分子的势能曲线。

DOI:
10.1021/acs.jpca.1c04613
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发表时间:
2021
期刊:
The journal of physical chemistry. A
影响因子:
--
通讯作者:
Bhattacharya D
Bhattacharya D
中科院分区:
--
文献类型:
--
作者:
Bhattacharya D

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分子离子势能曲线(PEC)的理论描述对于解释和预测母体分子电离后的电子-核耦合动力学至关重要。然而,准确表示核心或内价电离态的 PEC 并非易事,特别是在双键或三键系统的拉伸几何结构中。在这项工作中,我们使用最先进的量子化学方法报告了分子氮的单电离态和双电离态的 PEC。价态、内价态和核心电离态已被计算。已经实现了在多构型自洽场方法的轨道优化步骤中将核轨道和价轨道的处理分开的双环优化方案。该技术允许能量通过任意数量的核心或内壳孔会聚到任何所需的电离态。目前的工作还比较了使用核空穴态的离域和局域轨道集获得的 PEC。还计算了许多单电离和双电离价态的 PEC,并与以前的研究进行了比较。这里报告的计算的 PEC 预计对于未来的研究具有重要意义,以了解在与强自由电子激光相互作用时分子氮分解过程中光电离和俄歇光谱之间的相互作用。
Theoretical description of potential energy curves (PECs) of molecular ions is essential for interpretation and prediction of coupled electron-nuclear dynamics following ionization of parent molecule. However, an accurate representation of these PECs for core or inner valence ionized state is nontrivial, especially at stretched geometries for double- or triple-bonded systems. In this work, we report PECs of singly and doubly ionized states of molecular nitrogen using state-of-the-art quantum chemical methods. The valence, inner valence, and core ionized states have been computed. A double-loop optimization scheme that separates the treatment of the core and the valence orbitals during the orbital optimization step of the multiconfiguration self-consistent field method has been implemented. This technique allows the energy to be converged to any desired ionized state with any number of core or inner-shell holes. The present work also compares the PECs obtained using both delocalized and localized sets of orbitals for the core hole states. The PECs of a number of singly and doubly ionized valence states have also been computed and compared with previous studies. The computed PECs reported here are expected to be of importance for future studies to understand the interplay between photoionization and Auger spectra during the breakup of molecular nitrogen when interacting with intense free electron lasers.
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