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Dunning TH, Xu LT. Electronic structure of Li 1,2,3 +,0,- and nature of the bonding in Li 2,3 +,0,. J Comput Chem 2024; 45:405-418. [PMID: 37966878 DOI: 10.1002/jcc.27246] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2023] [Revised: 10/11/2023] [Accepted: 10/13/2023] [Indexed: 11/16/2023]
Abstract
The current study of the small lithium molecules Li2 +,0,- and Li3 +,0,- focuses on the nature of the bonding in these molecules as well as their structures and energetics (bond energies, ionization energies, and electron affinities). Valence CASSCF (2s,2p) calculations incorporate nondynamical electron correlation in the calculations, while the corresponding multireference configuration interaction and coupled cluster calculations incorporate dynamical electron correlation. Treatment of nondynamical correlation is critical for properly describing the Li2,3 +,0,- molecules as well as the Li- anion with dynamical correlation, in general, only fine-tuning the predictions. All lithium molecules and ions are bound, with the Li3 + and Li2 + ions being the most strongly bound, followed by Li3 - , Li2 , Li2 - and Li3 . The minimum energy structures of Li3 +,0,- are, respectively, an equilateral triangle, an isosceles triangle, and a linear structure. The results of SCGVB calculations are analyzed to obtain insights into the nature of the bonding in these molecules. An important finding of this work is that interstitial orbitals, a concept first put forward by McAdon and Goddard in 1985, play an essential role in the bonding of all lithium molecules considered here except for Li2 . The interstitial orbitals found in the Li3 +,0 molecules likely give rise to the non-nuclear attractors/maxima observed in these molecules.
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Affiliation(s)
- Thom H Dunning
- Department of Chemistry, University of Washington, Seattle, Washington, USA
| | - Lu T Xu
- Department of Chemistry, University of Washington, Seattle, Washington, USA
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2
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Nasiri S, Shomenov T, Bubin S, Adamowicz L. Dissociation energy and the lowest vibrational transition in LiH without assuming the non-Born–Oppenheimer approximation. Mol Phys 2022. [DOI: 10.1080/00268976.2022.2147105] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Affiliation(s)
- Saeed Nasiri
- Department of Physics, Nazarbayev University, Nur-Sultan, Kazakhstan
| | | | - Sergiy Bubin
- Department of Physics, Nazarbayev University, Nur-Sultan, Kazakhstan
| | - Ludwik Adamowicz
- Department of Chemistry and Biochemistry, University of Arizona, Tucson, AZ, USA
- Department of Physics, University of Arizona, Tucson, AZ, USA
- Centre for Advanced Study (CAS), the Norwegian Academy of Science and Letters, Oslo, Norway
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3
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Abstract
According to Ruedenberg's classic treatise on the theory of chemical bonding [K. Ruedenberg, Rev. Mod. Phys. 34, 326-376 (1962)], orbital contraction is an integral consequence of covalent bonding. While the concept is clear, its quantification by quantum chemical calculations is not straightforward, except for the simplest of molecules, such as H2 + and H2. This paper proposes a new, yet simple, approach to the problem, utilizing the modified atomic orbital (MAO) method of Ehrhardt and Ahlrichs [Theor. Chim. Acta 68, 231 (1985)]. Through the use of MAOs, which are an atom-centered minimal basis formed from the molecular and atomic density operators, the wave functions of the species of interest are re-expanded, allowing the computation of the kinetic energy (and any other expectation value) of free and bonded fragments. Thus, it is possible to quantify the intra- and interfragment changes in kinetic energy, i.e., the effects of contraction. Computations are reported for a number of diatomic molecules H2, Li2, B2, C2, N2, O2, F2, CO, P2, and Cl2 and the polyatomics CH3-CH3, CH3-SiH3, CH3-OH, and C2H5-C2H5 (where the single bonds between the heavy atoms are studied) as well as dimers of He, Ne, Ar, and the archetypal ionic molecule NaCl. In all cases, it is found that the formation of a covalent bond is accompanied by an increase in the intra-fragment kinetic energy, an indication of orbital contraction and/or deformation.
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Affiliation(s)
- George B Bacskay
- School of Chemistry, The University of Sydney, Sydney, NSW 2006, Australia
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4
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A new global potential energy surface of X2A′ state of Li2H system and quantum dynamics calculation of the H + Li2 → Li + LiH reaction. Chem Phys 2021. [DOI: 10.1016/j.chemphys.2021.111201] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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5
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Carvalho CMC, Gargano R, Martins JBL, Politi JRS. Accurate spectroscopic properties by diffusion quantum Monte Carlo calculations. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2020; 243:118707. [PMID: 32827906 DOI: 10.1016/j.saa.2020.118707] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/28/2020] [Revised: 07/05/2020] [Accepted: 07/13/2020] [Indexed: 06/11/2023]
Abstract
The capability of Diffusion Quantum Monte Carlo (DMC) to produce high quality potential energy curve (PEC) was evaluated. H2+, HeH+ and LiH PECs were built by all-electron fixed-node DMC calculations. Trial wave functions were obtained from Hartree-Fock (HF) (H2+), MCSCF and CI (HeH+ and LiH) calculations multiplied by Jastrow factor. The quality of these generated PECs was analyzed throughout equilibrium distance, dissociation energy, vibrational energies and rovibrational spectroscopic constants (ωe, ωexe, ωeye, αe, γe and Be). The Discrete Variable Representation (DVR) and the Dunham approaches were used to determine the rovibrational spectroscopic constants. The PECs and the aforementioned properties were also obtained by the following methods: MCSCF/aug-cc-pV5Z (LiH), CCSD(T)/aug-cc-pV5Z (HeH+ and LiH) and HF (H2+ and HeH+) levels. The results of these DMC computations, specially the DMC-DVR procedure, are the most accurate among others DMC calculations available in the literature for these systems. They suggest that DMC can be used to achieve accurate PECs to produce spectroscopic properties with the same level of accuracy of theoretical benchmarks and experimental data of the literature.
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Affiliation(s)
- Cassius M C Carvalho
- Institute of Chemistry, University of Brasília, Campus Darcy Ribeiro, Brasília, DF, Brazil
| | - Ricardo Gargano
- Institute of Physics, University of Brasília, Campus Darcy Ribeiro, Brasília, DF, Brazil
| | - João B L Martins
- Institute of Chemistry, University of Brasília, Campus Darcy Ribeiro, Brasília, DF, Brazil
| | - José Roberto S Politi
- Institute of Chemistry, University of Brasília, Campus Darcy Ribeiro, Brasília, DF, Brazil.
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7
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Røeggen I, Gao B. Perturbed atoms in molecules and solids: The PATMOS model. J Chem Phys 2013; 139:094104. [DOI: 10.1063/1.4818577] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
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8
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Rivero P, Jiménez-Hoyos CA, Scuseria GE. Predicting Singlet–Triplet Energy Splittings with Projected Hartree–Fock Methods. J Phys Chem A 2013; 117:8073-80. [DOI: 10.1021/jp405755z] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- Pablo Rivero
- Department of Chemistry, Rice University, Houston, Texas 77005-1892, United
States
| | | | - Gustavo E. Scuseria
- Department of Chemistry, Rice University, Houston, Texas 77005-1892, United
States
- Department of Physics
and Astronomy, Rice University, Houston,
Texas 77005-1892, United
States
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9
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Holka F, Szalay PG, Fremont J, Rey M, Peterson KA, Tyuterev VG. Accurate ab initio determination of the adiabatic potential energy function and the Born–Oppenheimer breakdown corrections for the electronic ground state of LiH isotopologues. J Chem Phys 2011; 134:094306. [DOI: 10.1063/1.3555758] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
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10
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Szalay PG, Holka F, Fremont J, Rey M, Peterson KA, Tyuterev VG. Are ab initio quantum chemistry methods able to predict vibrational states up to the dissociation limit for multi-electron molecules close to spectroscopic accuracy? Phys Chem Chem Phys 2011; 13:3654-9. [DOI: 10.1039/c0cp01334j] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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11
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Evangelista FA, Prochnow E, Gauss J, Schaefer HF. Perturbative triples corrections in state-specific multireference coupled cluster theory. J Chem Phys 2010; 132:074107. [DOI: 10.1063/1.3305335] [Citation(s) in RCA: 94] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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12
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Das S, Mukherjee D, Kállay M. Full implementation and benchmark studies of Mukherjee’s state-specific multireference coupled-cluster ansatz. J Chem Phys 2010; 132:074103. [DOI: 10.1063/1.3310288] [Citation(s) in RCA: 106] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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Evangelista FA, Simmonett AC, Schaefer HF, Mukherjee D, Allen WD. A companion perturbation theory for state-specific multireference coupled cluster methods. Phys Chem Chem Phys 2009; 11:4728-41. [PMID: 19492126 DOI: 10.1039/b822910d] [Citation(s) in RCA: 62] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
A partitioning scheme is applied to the state-specific Mukherjee multireference coupled cluster method to derive a companion perturbation theory (Mk-MRPT2). A production-level implementation of Mk-MRPT2 is reported. The effectiveness of the Mk-MRPT2 method is demonstrated by application to the classic F(2) dissociation problem and the lowest-lying electronic states of meta-benzyne, including computations with up to 766 atomic orbitals. We show that Mk-MRPT2 theory is particularly useful in multireference focal point extrapolations to determine ab initio limits.
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Affiliation(s)
- Francesco A Evangelista
- Center for Computational Chemistry and Department of Chemistry, University of Georgia, Athens, GA 30602, USA
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Mahapatra US, Chattopadhyay S, Chaudhuri RK. Application of state-specific multireference Møller–Plesset perturbation theory to nonsinglet states. J Chem Phys 2009; 130:014101. [DOI: 10.1063/1.3043364] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023] Open
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15
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Roos BO. The Complete Active Space Self-Consistent Field Method and its Applications in Electronic Structure Calculations. ADVANCES IN CHEMICAL PHYSICS 2007. [DOI: 10.1002/9780470142943.ch7] [Citation(s) in RCA: 584] [Impact Index Per Article: 34.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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Affiliation(s)
- Shashi P. Karna
- a Department of Chemistry , University of New Brunswick , Bag Service No 45222, Fredericton , N.B. , Canada , E3B 6E2
- b Dept. 48B/MS428 , IBM Corporation , Bldg. 963, Kingston , NY , 12401 , U.S.A
| | - Friedrich Grein
- a Department of Chemistry , University of New Brunswick , Bag Service No 45222, Fredericton , N.B. , Canada , E3B 6E2
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18
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Engström S, Jönsson B. Monte Carlo simulations of the electric field gradient fluctuation at the nucleus of a lithium ion in dilute aqueous solution. Mol Phys 2006. [DOI: 10.1080/00268978100102031] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Affiliation(s)
- Sven Engström
- a Department of Physical Chemistry 2 , Chemical Center , P.O.B. 740, S-220 07 , Lund 7 , Sweden
| | - Bo Jönsson
- a Department of Physical Chemistry 2 , Chemical Center , P.O.B. 740, S-220 07 , Lund 7 , Sweden
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19
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Towards the Development and Applications of Manifestly Spin-free Multi-reference Coupled Electron-pair Approximation-like Methods: A State Specific Approach. Theor Chem Acc 2006. [DOI: 10.1007/s00214-006-0108-2] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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20
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Torrent-Sucarrat M, Salvador P, Geerlings P, Solà M. On the quality of the hardness kernel and the Fukui function to evaluate the global hardness. J Comput Chem 2006; 28:574-83. [PMID: 17186480 DOI: 10.1002/jcc.20535] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
An approximated hardness kernel, which includes the second derivative with respect to the density of the kinetic energy, the electron-electron coulomb repulsion, and the exchange density functionals, has been tested for the calculation of the global hardness. The results obtained for a series of 40 cations and neutral systems and 16 anions represent in most cases an improvement of the results obtained using the HOMO-LUMO gap approach and indicate the viability of this approach to evaluate global hardness. In addition, the relevance of the Fukui function approximation and the role of the three components of the hardness kernel in the evaluation of the global hardness have been analyzed.
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Affiliation(s)
- Miquel Torrent-Sucarrat
- Eenheid Algemene Chemie, Faculteit Wetenschappen, Vrije Universiteit Brussel, Pleinlaan 2, Brussels, Belgium.
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21
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Bubin S, Adamowicz L, Molski M. An accurate non-Born–Oppenheimer calculation of the first purely vibrational transition in LiH molecule. J Chem Phys 2005; 123:134310. [PMID: 16223291 DOI: 10.1063/1.2047487] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
In this work we study the ground and the first vibrationally excited states of LiH molecule. We performed an extensive nonrelativistic variational calculations of the two states without using the Born-Oppenheimer approximation. The results are analyzed and compared with the data extracted from recent experiments. The 0<--1 transition energy obtained in the calculations converged to a value which is less than a wave number above the transition energy estimated from the available experimental data concerning the LiH rovibrational transitions. We discuss the remaining discrepancy and the procedure used to determine the "experimental" transition frequencies.
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Affiliation(s)
- Sergiy Bubin
- Department of Physics, University of Arizona, Tucson, Arizona 85721, USA
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22
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Guest * MF, Bush IJ, Van Dam HJJ, Sherwood P, Thomas JMH, Van Lenthe JH, Havenith RWA, Kendrick J. The GAMESS-UK electronic structure package: algorithms, developments and applications. Mol Phys 2005. [DOI: 10.1080/00268970512331340592] [Citation(s) in RCA: 368] [Impact Index Per Article: 19.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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23
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Wang BW, Chan L, Chan SP, Chen ZD, Liu ZF. A diradical mechanism for the addition of F2 to ethene: A density functional theory study. J Chem Phys 2004; 120:9467-72. [PMID: 15267958 DOI: 10.1063/1.1711599] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
The long disputed mechanism for the F(2) addition to ethene is elucidated by density functional theory calculations. With hybrid functionals and a large basis set, DFT provides an excellent description for the dissociation of ground state F(2), and a reasonable account for the F(2)...C(2)H(4) van der Waals complex, which makes it possible for the modeling of reactions between elemental fluorine and organic molecules. The attack of F(2) on ethene first produces a diradical intermediate, which then dissociates into two radicals CH(2)F-CH(2) and F. The first step is exothermic with a low barrier around 1.8 kcal/mol, and the exothermic energy is more than enough to overcome the barrier in the second step for the homolysis of the dangling F-F bond in the diradical, although the presence of solvents and matrices environment could stabilize the diradical. Our calculations provide a coherent framework to understand this reaction not only in the gas and solution phases, but also in the matrices environment where mode-specific enhancement is observed for the addition process induced by infrared radiation.
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Affiliation(s)
- Bing-wu Wang
- Department of Chemistry and Centre for Scientific Modeling and Computation, Chinese University of Hong Kong, Shatin, Hong Kong, China
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24
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Ab initio calculations of doubly resonant sum-frequency generation second-order polarizabilities of LiH. Chem Phys Lett 2003. [DOI: 10.1016/j.cplett.2003.09.042] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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25
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Modelling of Octahedral Manganese II Complexes with Inorganic Ligands: A Problem with Spin-States. Int J Mol Sci 2003. [DOI: 10.3390/i4080503] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
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26
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Li X, Paldus J. An accurate determination of rovibrational spectra using the externally corrected coupled-cluster approaches: LiH ground state. J Chem Phys 2003. [DOI: 10.1063/1.1535438] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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27
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28
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Hotta S, Doi K, Nakamura K, Tachibana A. High-spin electronic interaction of small lithium and sodium cluster formation in the excited states. J Chem Phys 2002. [DOI: 10.1063/1.1480869] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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29
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Affiliation(s)
- Craig A. Bayse
- Department of Chemistry and Biochemistry, Old Dominion University, Norfolk, Virginia 23529
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AVRAMOPOULOS A, PAPADOPOULOS MG. Trends in the electronic and vibrational contributions to the dipole moment, polarizabilities, and first and second hyperpolarizabilities of the hydrides of Li, Na and K. Mol Phys 2002. [DOI: 10.1080/00268970110097839] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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31
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TURTLE – A gradient VBSCF Program Theory and Studies of Aromaticity. THEORETICAL AND COMPUTATIONAL CHEMISTRY 2002. [DOI: 10.1016/s1380-7323(02)80005-x] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/11/2023]
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32
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Pittner J, Šmydke J, Čársky P, Hubač I. State-specific Brillouin–Wigner multireference coupled cluster study of the F2 molecule: assessment of the a posteriori size-extensivity correction. ACTA ACUST UNITED AC 2001. [DOI: 10.1016/s0166-1280(01)00473-0] [Citation(s) in RCA: 44] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Dulick M, Zhang K, Guo B, Bernath PF. Far- and Mid-Infrared Emission Spectroscopy of LiH and LiD. JOURNAL OF MOLECULAR SPECTROSCOPY 1998; 188:14-26. [PMID: 9480798 DOI: 10.1006/jmsp.1997.7430] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
High-resolution Fourier transform spectra of LiH and LiD were recorded in the far-infrared region, 100-360 cm-1, and the mid-infrared regions, 800-1200 cm-1 and 2000-3000 cm-1. A total of 261 pure rotational lines and 678 rovibrational lines were measured for the isotopomers 6LiH(D) and 7LiH(D). Molecular constants for the X1Sigma+ ground state in the form of mass-dependent Dunham Yij's and mass-independent Dunham Uij's were determined from a data set of 1476 lines, consisting of our measured line positions and previously reported microwave, millimeter-wave, and infrared lines. An effective internuclear potential for the ground electronic state where the Born-Oppenheimer part is modeled as a parameterized modified-Morse function was also determined from a fit of the data. Copyright 1998 Academic Press.
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Affiliation(s)
- M Dulick
- National Solar Observatory, National Optical Astronomy Observatories, Tucson, Arizona, 85726
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34
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Hoffmann MR. Canonical Van Vleck Quasidegenerate Perturbation Theory with Trigonometric Variables. ACTA ACUST UNITED AC 1996. [DOI: 10.1021/jp952753r] [Citation(s) in RCA: 52] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Mark R. Hoffmann
- Department of Chemistry, University of North Dakota, Grand Forks, North Dakota 58202-9024
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Sun Z, Barnett RN, Lester WA. Quantum and variational Monte Carlo interaction potentials for Li2 (X 1Σ+g). Chem Phys Lett 1992. [DOI: 10.1016/0009-2614(92)85618-k] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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39
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Laser vaporization: A versatile method for studying metal clusters. J CHEM SCI 1991. [DOI: 10.1007/bf02842088] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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40
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Broström L, Larsson M, Mannervik S, Short RT, Sonnek D. Photodissociation of Ne+2. ACTA ACUST UNITED AC 1991. [DOI: 10.1039/ft9918700797] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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42
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Wolinski K, Pulay P. Generalized Mo/ller–Plesset perturbation theory: Second order results for two‐configuration, open‐shell excited singlet, and doublet wave functions. J Chem Phys 1989. [DOI: 10.1063/1.456696] [Citation(s) in RCA: 213] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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43
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Use of Cluster Expansion Methods in the Open-Shell Correlation Problem. ADVANCES IN QUANTUM CHEMISTRY 1989. [DOI: 10.1016/s0065-3276(08)60629-2] [Citation(s) in RCA: 345] [Impact Index Per Article: 9.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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44
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Schüle J, Siegbahn P, Wahlgren U. A theoretical study of methyl chemisorption on Ni(111). J Chem Phys 1988. [DOI: 10.1063/1.455324] [Citation(s) in RCA: 84] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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45
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Darvesh KV, Grein F. Configuration selection in the MC SCF method. The van der Waals X2Σ+ state of LiHe. Chem Phys Lett 1988. [DOI: 10.1016/0009-2614(88)80232-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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48
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Laidig WD, Saxe P, Bartlett RJ. The description of N2 and F2 potential energy surfaces using multireference coupled cluster theory. J Chem Phys 1987. [DOI: 10.1063/1.452291] [Citation(s) in RCA: 308] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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49
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Hadinger G, Tergiman YS. Adiabatic corrections to the potential energy curves of the X 1∑+ state of the isotopic lithium hydrides. J Chem Phys 1986. [DOI: 10.1063/1.451422] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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50
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Hamilton TP, Pulay P. Direct inversion in the iterative subspace (DIIS) optimization of open‐shell, excited‐state, and small multiconfiguration SCF wave functions. J Chem Phys 1986. [DOI: 10.1063/1.449880] [Citation(s) in RCA: 116] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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