Photo-emission spectroscopy directly probes individual electronic states, ranging from single excitations to high-energy satellites, which simultaneously represent multiple quasiparticles (QPs) and encode information about electronic correlation. First-principles description of the spectra requires an efficient and accurate treatment of all many-body effects. This is especially challenging for inner valence excitations where the single QP picture breaks down. Here, we provide the full valence spectra of small closed-shell molecules, exploring the independent and interacting quasiparticle regimes, computed with the fully-correlated adaptive sampling configuration interaction (ASCI) method. We critically compare these results to calculations with the many-body perturbation theory, based on the $GW$ and vertex corrected $GWΓ$ approaches. The latter explicitly accounts for two-QP quantum interactions, which have been often neglected. We demonstrate that for molecular systems, the vertex correction universally improves the theoretical spectra, and it is crucial for accurate prediction of QPs as well as capturing the rich satellite structures of high-energy excitations. $GWΓ$ offers a unified description across all relevant energy scales. Our results suggest that the multi-QP regime corresponds to dynamical correlations, which can be described via perturbation theory.
Fine- and hyperfine-structure effects in molecular photoionization: II. Resonance-enhanced multiphoton ionization and hyperfine-selective generation of molecular cations
Ionization-Driven Dehydrogenation and Molecular Growth in Gas-Phase Adamantane Clusters
Université Caen Normandie, ENSICAEN, CNRS, CEA, Normandie Univ, CIMAP UMR6252(卡昂诺曼底大学,ENSICAEN,法国国家科学研究中心,法国原子能和替代能源委员会);Lund University(隆德大学);University of Gothenburg(哥德堡大学);Institute of Physical Chemistry, Polish Academy of Sciences(波兰科学院物理化学研究所)
Influence of molecular symmetry on strong-field ionization: Studies on ethylene, benzene, fluorobenzene, and chlorofluorobenzene
利用分子强场近似,我们考虑了分子对称性对强线偏振激光脉冲电离分子的影响。电子角分布和总电离产率计算作为分子和激光偏振之间的相对取向的函数。我们的研究集中在乙烯(C $_2$ H $_4$)、苯(C $_6$ H $_6$)、氟苯(C $_6$ H $_5$ F)和邻氯氟苯(1,2 C $_6$ H $_4$ ClF),这些分子代表四种不同的点群。实验结果进行了比较,当可用时,并与适当扩展到非线性多原子分子的分子隧穿理论。我们的研究表明,电离产率的取向依赖性主要是由节点表面结构的分子轨道。
Ionization of 1D and 3D oriented asymmetric top molecules by intense circularly polarized femtosecond laser pulses
采用圆偏振非共振飞秒激光脉冲对三维取向非对称陀螺分子苯甲腈(C $_7$ H $_5$ N)的强场电离进行了实验和理论研究.在与强场相互作用之前,使用偏转器对分子进行量子态选择,并使用椭圆偏振激光脉冲结合静态电场对分子进行三维(3D)排列和定向。在分子框架光电子动量分布的特征分裂揭示了电离发生的分子轨道的节面的位置。实验结果支持的理论隧道模型,包括和量化的分裂的动量分布。本文的重点是了解强场电离从三维取向的非对称顶部分子,特别是抑制电子发射的节面的分子轨道。在前一篇文章[Dimitrovski等人,A83,023405(2011)],重点是理解一维取向的极性分子的强场电离,特别是光电子发射方向上的不对称性。
The use of fast molecular descriptors and artificial neural networks approach in organochlorine compounds electron ionization mass spectra classification
A quantum chemical study from a molecular perspective: ionization and electron attachment energies for species often used to fabricate single-molecule junctions
准确测定嵌入分子结中的分子的最低电子附着($EA$)和电离($IP$)能量对于正确估计\emph{e.g.}、电流($I$)或偏置($V$)的幅度(其中$I-V$曲线表现出显著的非欧姆行为)是重要的。用于制备n型导电单分子结的几种典型分子的最低电子附着能和电离能的基准计算(4,4 '-联吡啶、1,4-二氰基苯和4,4'-二氰基-1,1 '-联苯)和p型导电(苯二硫醇,联苯二硫醇,己烷单硫醇,基于EOM-CCSD(equation-of-motion coupled-cluster singles and doubles)的量子化学方法,研究了正己二硫醇与正己二硫醇之间的相互作用。它们表明与目前分子运输方法中获得的结果存在显着差异。本研究强调,除了一个可靠的量子化学方法,基组比无处不在的双zeta设置用于运输计算更好的是必要的。后者对于正确地确定$EA$是特别关键的问题,这在不包括足够的扩散基函数的情况下是不可能的。主导分子轨道(MO)的空间分布是另一个重要的问题,本研究引起了人们的注意,因为它敏感地影响由于在电极中形成的图像电荷的MO-能量移动$Φ$。目前的结果不能证实电极之间中点的点状MO的常见假设,其实质上影响实际的$Φ$值。
All-electron GW calculation for molecules: Ionization energy and electron affinity of conjugated molecules
在全无规相近似下,在分子轨道空间提出了一种有效的分子全电子G $^0$ W $^0$方法和准粒子自洽GW(QSGW)方法.检验了算法的基集收敛性。作为应用,计算了一系列共轭分子(最多32个原子)的电离能($I$)和电子亲合能($A$),并与实验进行了比较。QSGW的计算结果改进了G $^0$ W $^0$的计算结果,与Hartree-Fock(HF)和杂化密度泛函计算的结果相比,两者都更符合实验数据,特别是对于$A$ .近似正确的能隙和HF交换抑制自相互作用误差使我们的方法成为研究分子系统的电子和输运性质的一个很好的候选者。
Ab initio studies of ionization potentials of hydrated hydroxide and hydronium
用多体方法计算了氢氧化物和水合氢离子的电离势分布,电子激发构型由{ \it ab initio}分子动力学产生。实验结果得到了很好的再现,并与分子激发态密切相关。在稳定构型中,电离势主要受第一溶剂化层内水分子的扰动。另一方面,在质子转移过程中,电子激发在质子接收复合物和质子供给复合物上都是离域的,这使得两种水合离子的激发能发生移动,光谱变宽。
Visualizing intense laser field driven electron dynamics in a multielectron molecule: dynamic electron localization, bonding properties and multiple ionization bursts
Quantum self-consistent equation-of-motion method for computing molecular excitation energies, ionization potentials, and electron affinities on a quantum computer