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Huang M, Evangelista FA. Benchmark Study of Core-Ionization Energies with the Generalized Active Space-Driven Similarity Renormalization Group. J Chem Theory Comput 2024. [PMID: 39271297 PMCID: PMC11428169 DOI: 10.1021/acs.jctc.4c00835] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/15/2024]
Abstract
X-ray photoelectron spectroscopy (XPS) is a powerful experimental technique for probing the electronic structure of molecules and materials; however, interpreting XPS data requires accurate computational methods to model core-ionized states. This work proposes and benchmarks a new approach based on the generalized active space-driven similarity renormalization group (GAS-DSRG) for calculating core-ionization energies and treating correlation effects at the perturbative and nonperturbative levels. We tested the GAS-DSRG across three data sets. First, the vertical core-ionization energies of small molecules containing first-row elements are evaluated. GAS-DSRG achieves mean absolute errors below 0.3 eV, which is comparable to high-level coupled cluster methods. Next, the accuracy of GAS-DSRG is evaluated for larger organic molecules using the CORE65 data set, with the DSRG-MRPT3 level yielding a mean absolute error of only 0.34 eV for 65 core-ionization transitions. Insights are provided into the treatment of static and dynamic correlation, the importance of high-order perturbation theory, and notable differences from density functional theory in the predicted energy ordering of core-ionized states for specific molecules. Finally, vibrationally resolved XPS spectra of diatomic molecules (CO, N2, and O2) are simulated, showing excellent agreement with experimental data.
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Affiliation(s)
- Meng Huang
- Department of Chemistry and Cherry Emerson Center for Scientific Computation, Emory University, Atlanta, Georgia 30322, United States
| | - Francesco A Evangelista
- Department of Chemistry and Cherry Emerson Center for Scientific Computation, Emory University, Atlanta, Georgia 30322, United States
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2
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Santos ACF, Lucas CA, Lago AF, Oliveira RR, Rocha AB, de Souza GGB. Ionic Fragmentation of the Halothane Molecule Induced by EUV and Soft X-ray Radiation. J Phys Chem A 2024; 128:7407-7416. [PMID: 39178341 PMCID: PMC11382275 DOI: 10.1021/acs.jpca.4c04341] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/25/2024]
Abstract
EUV and soft X-ray-induced photofragmentation of the halothane (CF3CHBrCl) molecule has been investigated using time-of-flight mass spectrometry in the coincidence mode (PEPICO) covering the valence region and vicinity of the bromine 3d, chlorine 2p, and carbon 1s edges. Total and partial ion yields have been recorded as a function of photon energy. At lower photon energies, the heavier singly charged molecular fragments predominate in the mass spectra. On the other hand, there is a strong tendency to the atomization of the molecule at higher photon energies. Despite the different chemical environments experienced by the two carbon atoms, weak site-specific fragmentation is observed. In addition, ab initio quantum mechanical calculations at the MP2 level and a series of computations with multiconfigurational self-consistent field have been performed to describe the inner-shell states.
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Affiliation(s)
- A C F Santos
- Instituto de Física, Universidade Federal do Rio de Janeiro (UFRJ), Ilha do Fundão, Rio de Janeiro 21949-900, RJ, Brazil
| | - C A Lucas
- Instituto de Química, Universidade Federal Fluminense, Outeiro de São João Batista s/n, Campus do Valonguinho, Niterói 24020-141, Brazil
| | - A F Lago
- Centro de Ciências Naturais e Humanas, Universidade Federal do ABC (UFABC), Av. dos Estados, 5001, Santo André 09210-580, Sao Paulo, Brazil
| | - R R Oliveira
- Instituto de Química, Universidade Federal do Rio de Janeiro (UFRJ), Ilha do Fundão, Rio de Janeiro 21949-900, RJ, Brazil
| | - A B Rocha
- Instituto de Química, Universidade Federal do Rio de Janeiro (UFRJ), Ilha do Fundão, Rio de Janeiro 21949-900, RJ, Brazil
| | - G G B de Souza
- Instituto de Química, Universidade Federal do Rio de Janeiro (UFRJ), Ilha do Fundão, Rio de Janeiro 21949-900, RJ, Brazil
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Gaba NP, de Moura CEV, Majumder R, Sokolov AY. Simulating transient X-ray photoelectron spectra of Fe(CO) 5 and its photodissociation products with multireference algebraic diagrammatic construction theory. Phys Chem Chem Phys 2024; 26:15927-15938. [PMID: 38805029 DOI: 10.1039/d4cp00801d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/29/2024]
Abstract
Accurate simulations of transient X-ray photoelectron spectra (XPS) provide unique opportunities to bridge the gap between theory and experiment in understanding the photoactivated dynamics in molecules and materials. However, simulating X-ray photoelectron spectra along a photochemical reaction pathway is challenging as it requires accurate description of electronic structure incorporating core-hole screening, orbital relaxation, electron correlation, and spin-orbit coupling in excited states or at nonequilibrium ground-state geometries. In this work, we employ the recently developed multireference algebraic diagrammatic construction theory (MR-ADC) to investigate the core-ionized states and X-ray photoelectron spectra of Fe(CO)5 and its photodissociation products (Fe(CO)4, Fe(CO)3) following excitation with 266 nm light. The simulated transient Fe 3p and CO 3σ XPS spectra incorporating spin-orbit coupling and high-order electron correlation effects are shown to be in a good agreement with the experimental measurements by Leitner et al. [J. Chem. Phys., 2018, 149, 044307]. Our calculations suggest that core-hole screening, spin-orbit coupling, and ligand-field splitting effects are similarly important in reproducing the experimentally observed chemical shifts in transient Fe 3p XPS spectra of iron carbonyl complexes. Our results also demonstrate that the MR-ADC methods can be very useful in interpreting the transient XPS spectra of transition metal compounds.
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Affiliation(s)
- Nicholas P Gaba
- Department of Chemistry and Biochemistry, The Ohio State University, Columbus, Ohio, 43210, USA.
| | - Carlos E V de Moura
- Department of Chemistry and Biochemistry, The Ohio State University, Columbus, Ohio, 43210, USA.
| | - Rajat Majumder
- Department of Chemistry and Biochemistry, The Ohio State University, Columbus, Ohio, 43210, USA.
| | - Alexander Yu Sokolov
- Department of Chemistry and Biochemistry, The Ohio State University, Columbus, Ohio, 43210, USA.
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Brumboiu IE, Fransson T. Core-hole delocalization for modeling X-ray spectroscopies: A cautionary tale. J Chem Phys 2022; 156:214109. [DOI: 10.1063/5.0088195] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
The influence of core-hole delocalization for X-ray photoelectron, X-ray absorption, and X-ray emission spectrum calculations is investigated in detail, using approaches including response theory, transition-potential methods, and ground state schemes. The question of a localized/delocalized vacancy is relevant for systems with symmetrically equivalent atoms, as well as near-degeneracies which can distribute the core-orbitals over several atoms. We show that issues relating to core-hole delocalization are present for calculations considering explicit core-hole states, e.g. when using a core-excited or core-ionized reference state, or for fractional occupation numbers. Including electron correlation eventually alleviates the issues, but even using CCSD(T) there is a noticable discrepancy between core-ionization energies obtained with a localized and delocalized core-hole (0.5 eV for the carbon K-edge). Within density functional theory, the discrepancy correlates to the exchange interaction involving the core orbitals of the same spin symmetry as the delocalized core-hole. The use of a localized core-hole allows for a reasonably good inclusion of relaxation at lower level of theory, whereas the proper symmetry solution involving a delocalized core-hole requires higher levels of theory to account for the correlation effects involved in orbital relaxation. For linear response methods, we further show that if X-ray absorption spectra are modelled by considering symmetry-unique sets of atoms, care has to be taken such that there are no delocalizations of the core orbitals, which would otherwise introduce shifts in absolute energies and relative features.
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Affiliation(s)
- Iulia Emilia Brumboiu
- Faculty of Physics, Astronomy and Informatics, Nicolaus Copernicus University in Torun Institute of Physics, Poland
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de Moura CEV, Sokolov AY. Simulating X-ray photoelectron spectra with strong electron correlation using multireference algebraic diagrammatic construction theory. Phys Chem Chem Phys 2022; 24:4769-4784. [DOI: 10.1039/d1cp05476g] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
A new theoretical approach for the simulations of X-ray photoelectron spectra of strongly correlated molecular systems that combines multireference algebraic diagrammatic construction theory (MR-ADC) with a core–valence separation (CVS) technique.
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Affiliation(s)
- Carlos E. V. de Moura
- Department of Chemistry and Biochemistry, The Ohio State University, Columbus, Ohio, 43210, USA
| | - Alexander Yu. Sokolov
- Department of Chemistry and Biochemistry, The Ohio State University, Columbus, Ohio, 43210, USA
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Bhattacharya D, Shamasundar KR, Emmanouilidou A. Potential Energy Curves of Molecular Nitrogen for Singly and Doubly Ionized States with Core and Valence Holes. J Phys Chem A 2021; 125:7778-7787. [PMID: 34477371 DOI: 10.1021/acs.jpca.1c04613] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
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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Affiliation(s)
- Debarati Bhattacharya
- Department of Physics and Astrophysics, University College London, Gower Street, London WC1E 6BT, U.K
| | - K R Shamasundar
- Indian Institute of Science Education and Research, Mohali, Sector 81, SAS Nagar, Mohali 140306, India
| | - Agapi Emmanouilidou
- Department of Physics and Astrophysics, University College London, Gower Street, London WC1E 6BT, U.K
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7
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Tenório BN, de Moura CE, Oliveira RR, Rocha AB. Transitions energies, optical oscillator strengths and partial potential energy surfaces of inner-shell states of water clusters. Chem Phys 2018. [DOI: 10.1016/j.chemphys.2018.04.009] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Corral I, González-Vázquez J, Martín F. Potential Energy Surfaces of Core-Hole and Shake-Up States for Dissociative Ionization Studies. J Chem Theory Comput 2017; 13:1723-1736. [DOI: 10.1021/acs.jctc.6b01214] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Affiliation(s)
- Inés Corral
- Departamento
de Química, Módulo 13, Universidad Autónoma de Madrid, 28049 Madrid, Spain
- Institute
for Advanced Research in Chemical Sciences (IADCHEM), Universidad Autónoma de Madrid, 28049 Madrid, Spain
| | - Jesús González-Vázquez
- Departamento
de Química, Módulo 13, Universidad Autónoma de Madrid, 28049 Madrid, Spain
- Institute
for Advanced Research in Chemical Sciences (IADCHEM), Universidad Autónoma de Madrid, 28049 Madrid, Spain
| | - Fernando Martín
- Departamento
de Química, Módulo 13, Universidad Autónoma de Madrid, 28049 Madrid, Spain
- Instituto Madrileño de Estudios Avanzados en Nanociencia, Campus de Cantoblanco, 28049 Madrid, Spain
- Condensed
Matter Physics Center (IFIMAC), Universidad Autónoma de Madrid, 28049 Madrid, Spain
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Varas LR, Coutinho LH, Bernini RB, Betancourt A, de Moura CEV, Rocha AB, de Souza GGB. Breaking the disulfide chemical bond using high energy photons: the dimethyl disulfide and methyl propyl disulfide molecules. RSC Adv 2017. [DOI: 10.1039/c7ra05001a] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
In order to study the stability of the disulfide chemical bond in molecules subjected to a flux of high energy photons, the ionic fragmentation of DMDS and MPDS has been studied following excitation around the S 1s edge (∼2470 eV).
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Affiliation(s)
- L. R. Varas
- Escuela de Ingeniería Química
- Universidad de Costa Rica
- Sede Central Rodrigo Facio
- Facultad de Ingeniería
- 11501-2060 San José
| | - L. H. Coutinho
- Instituto de Física
- Universidade Federal do Rio de Janeiro
- Cidade Universitária
- Rio de Janeiro
- Brazil
| | - R. B. Bernini
- Instituto Federal de Ciência e Tecnologia do Rio de Janeiro (IFRJ)
- Duque de Caxias
- Brazil
| | - A. M. Betancourt
- Escuela de Ingeniería Química
- Universidad de Costa Rica
- Sede Central Rodrigo Facio
- Facultad de Ingeniería
- 11501-2060 San José
| | - C. E. V. de Moura
- Instituto de Química
- Universidade Federal do Rio de Janeiro
- Cidade Universitária
- Rio de Janeiro
- Brazil
| | - A. B. Rocha
- Instituto de Química
- Universidade Federal do Rio de Janeiro
- Cidade Universitária
- Rio de Janeiro
- Brazil
| | - G. G. B. de Souza
- Instituto de Química
- Universidade Federal do Rio de Janeiro
- Cidade Universitária
- Rio de Janeiro
- Brazil
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10
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Rocha AB. Spin-orbit splitting for inner-shell 2p states. J Mol Model 2014; 20:2355. [PMID: 25031078 DOI: 10.1007/s00894-014-2355-9] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2014] [Accepted: 06/15/2014] [Indexed: 10/25/2022]
Abstract
A strategy to calculate spin-orbit splitting for inner-shell transitions at an ab initio level is presented. The initial wave function is calculated for a spinless Hamiltonian at a multiconfigurational level, with just a few configurations, followed by multireference configuration interaction in order to establish a set of singlet and triplet states at 2p excitation edge. Then, the full Breit-Pauli Hamiltonian is formed and diagonalized on this state basis. The spin-orbit splitting is determined by a graphical procedure depending on the intensity of the transition from ground state. The specific states studied are those originating from 2p transitions in argon, HCl, H2S, and PH3.
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Affiliation(s)
- Alexandre B Rocha
- Instituto de Química, Departamento de Físico-Química, Universidade Federal do Rio de Janeiro, Cidade Universitária, CT Bloco A. Rio de Janeiro, 21941-909, Rio de Janeiro, Brazil,
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11
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Transition energy and potential energy curves for ionized inner-shell states of CO, O2 and N2 calculated by several inner-shell multiconfigurational approaches. J Mol Model 2012; 19:2027-33. [DOI: 10.1007/s00894-012-1622-x] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2012] [Accepted: 10/01/2012] [Indexed: 11/27/2022]
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12
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Bernini RB, da Silva LBG, Rodrigues FN, Coutinho LH, Rocha AB, de Souza GGB. Core level (S 2p) excitation and fragmentation of the dimethyl sulfide and dimethyldisulfide molecules. J Chem Phys 2012; 136:144307. [DOI: 10.1063/1.3701567] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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