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Damour Y, Gallo A, Scemama A. Stochastically accelerated perturbative triples correction in coupled cluster calculations. J Chem Phys 2024; 161:034104. [PMID: 39007376 DOI: 10.1063/5.0220730] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2024] [Accepted: 06/26/2024] [Indexed: 07/16/2024] Open
Abstract
We introduce a novel algorithm that leverages stochastic sampling techniques to compute the perturbative triples correction in the coupled-cluster framework. By combining elements of randomness and determinism, our algorithm achieves a favorable balance between accuracy and computational cost. The main advantage of this algorithm is that it allows for the calculation to be stopped at any time, providing an unbiased estimate, with a statistical error that goes to zero as the exact calculation is approached. We provide evidence that our semi-stochastic algorithm achieves substantial computational savings compared to traditional deterministic methods. Specifically, we demonstrate that a precision of 0.5 millihartree can be attained with only 10% of the computational effort required by the full calculation. This work opens up new avenues for efficient and accurate computations, enabling investigations of complex molecular systems that were previously computationally prohibitive.
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Affiliation(s)
- Yann Damour
- Laboratoire de Chimie et Physique Quantiques (UMR 5626), Université de Toulouse, CNRS, UPS, Toulouse, France
| | - Alejandro Gallo
- Institute for Theoretical Physics, TU Wien, Wiedner Hauptstraße 8-10/136, 1040 Vienna, Austria
| | - Anthony Scemama
- Laboratoire de Chimie et Physique Quantiques (UMR 5626), Université de Toulouse, CNRS, UPS, Toulouse, France
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El Amri A, Kadiri L, Hsissou R, Lebkiri A, Wardighi Z, Rifi EH, Lebkiri A. Investigation of Typha Latifolia (TL) as potential biosorbent for removal of the methyl orange anionic dye in the aqueous solution. Kinetic and DFT approaches. J Mol Struct 2023. [DOI: 10.1016/j.molstruc.2022.134098] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
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Watson PD, McKinley AJ, Wild DA. Photoelectron Spectroscopy and High-Level Ab Initio Calculations of the Iodide-Methylperoxy Radical Complex. J Phys Chem A 2022; 126:3072-3079. [PMID: 35549219 DOI: 10.1021/acs.jpca.2c00299] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Anion photoelectron spectroscopy has been used to investigate the structure and dynamics of CH3OOI- van der Waals complexes. Peaks within the photoelectron spectrum are attributed to photodetachment to the perturbed 2P3/2 state of I···CH3OO (3.46 eV) and the two 2P states of bare iodine. A broad feature at 1.7-2.4 eV is attributed to detachment to the excited singlet states from two O2-···CH3I complexes. This represents the first anion photoelectron spectroscopy of a halide-bound methylperoxy radical species. Complex structures have been optimized using MP2/aug-cc-pVQZ with single-point energies at W1w theory for ground-state complexes and NEVPT2 for photodetachment to excited O2. Interactions are dominated by electrostatics, with the anion species interacting with the methyl pocket of the solvating molecule, suggesting conversion via an SN2 mechanism, and excess energy leading to complex dissociation within the timescale of mass spectrometry. The calculated W1w Gibbs energies suggest that while an electron transfer (ET) pathway to conversion is available, it is comparatively unfavored.
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Affiliation(s)
- Peter D Watson
- School of Molecular Sciences, The University of Western Australia, Crawley, Western Australia 6009, Australia
| | - Allan J McKinley
- School of Molecular Sciences, The University of Western Australia, Crawley, Western Australia 6009, Australia
| | - Duncan A Wild
- School of Molecular Sciences, The University of Western Australia, Crawley, Western Australia 6009, Australia
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Halides and the carbon-carbon double bond: Interactions of ethylene with bromide and iodide. Chem Phys Lett 2022. [DOI: 10.1016/j.cplett.2022.139433] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Watson PD, Corkish TR, Haakansson CT, McKinley AJ, Wild DA. Halide–propene complexes: validated DSD-PBEP86-D3BJ calculations and photoelectron spectroscopy. Phys Chem Chem Phys 2022; 24:25842-25852. [DOI: 10.1039/d2cp03796c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Anion photoelectron spectroscopy has been used to determine the electron binding energies of the X−⋯C3H6 (X = Cl, Br, I) complexes.
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Affiliation(s)
- Peter D. Watson
- School of Molecular Sciences, The University of Western Australia, Crawley, 6009, Western Australia, Australia
- Department of Chemistry, Physical and Theoretical Chemistry Laboratory, University of Oxford, South Parks Road, Oxford, OX1 3QZ, UK
| | - Timothy R. Corkish
- School of Molecular Sciences, The University of Western Australia, Crawley, 6009, Western Australia, Australia
| | - Christian T. Haakansson
- School of Molecular Sciences, The University of Western Australia, Crawley, 6009, Western Australia, Australia
| | - Allan J. McKinley
- School of Molecular Sciences, The University of Western Australia, Crawley, 6009, Western Australia, Australia
| | - Duncan A. Wild
- School of Molecular Sciences, The University of Western Australia, Crawley, 6009, Western Australia, Australia
- School of Science, Edith Cowan University, Joondalup, 6027, Western Australia, Australia
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Haakansson CT, Corkish TR, Watson PD, Robinson HT, Tsui T, McKinley AJ, Wild DA. Spectroscopic Investigation of Chalcogen Bonding: Halide-Carbon Disulfide Complexes. Chemphyschem 2021; 22:808-812. [PMID: 33704887 DOI: 10.1002/cphc.202100148] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2021] [Indexed: 11/09/2022]
Abstract
A combined experimental and theoretical approach has been used to study intermolecular chalcogen bonding. Specifically, the chalcogen bonding occurring between halide anions and CS2 molecules has been investigated using both anion photoelectron spectroscopy and high-level CCSD(T) calculations. The relative strength of the chalcogen bond has been determined computationally using the complex dissociation energies as well as experimentally using the electron stabilisation energies. The anion complexes featured dissociation energies on the order of 47 kJ/mol to 37 kJ/mol, decreasing with increasing halide size. Additionally, the corresponding neutral complexes have been examined computationally, and show three loosely-bound structural motifs and a molecular radical.
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Affiliation(s)
- Christian T Haakansson
- School of Molecular Sciences, The University of Western Australia, 35 Stirling Highway, Crawley, 6009, Perth, Western Australia
| | - Timothy R Corkish
- School of Molecular Sciences, The University of Western Australia, 35 Stirling Highway, Crawley, 6009, Perth, Western Australia
| | - Peter D Watson
- School of Molecular Sciences, The University of Western Australia, 35 Stirling Highway, Crawley, 6009, Perth, Western Australia
| | - Hayden T Robinson
- School of Molecular Sciences, The University of Western Australia, 35 Stirling Highway, Crawley, 6009, Perth, Western Australia
| | - Terrence Tsui
- School of Molecular Sciences, The University of Western Australia, 35 Stirling Highway, Crawley, 6009, Perth, Western Australia
| | - Allan J McKinley
- School of Molecular Sciences, The University of Western Australia, 35 Stirling Highway, Crawley, 6009, Perth, Western Australia
| | - Duncan A Wild
- School of Molecular Sciences, The University of Western Australia, 35 Stirling Highway, Crawley, 6009, Perth, Western Australia
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Corkish TR, Haakansson CT, Watson PD, McKinley AJ, Wild DA. Photoelectron Spectroscopy and Structures of X - ⋅⋅⋅CH 2 O (X=F, Cl, Br, I) Complexes. Chemphyschem 2021; 22:69-75. [PMID: 33184977 DOI: 10.1002/cphc.202000852] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2020] [Revised: 11/12/2020] [Indexed: 11/11/2022]
Abstract
A combined experimental and theoretical approach has been used to investigate X- ⋅⋅⋅CH2 O (X=F, Cl, Br, I) complexes in the gas phase. Photoelectron spectroscopy, in tandem with time-of-flight mass spectrometry, has been used to determine electron binding energies for the Cl- ⋅⋅⋅CH2 O, Br- ⋅⋅⋅CH2 O, and I- ⋅⋅⋅CH2 O species. Additionally, high-level CCSD(T) calculations found a C2v minimum for these three anion complexes, with predicted electron detachment energies in excellent agreement with the experimental photoelectron spectra. F- ⋅⋅⋅CH2 O was also studied theoretically, with a Cs hydrogen-bonded complex found to be the global minimum. Calculations extended to neutral X⋅⋅⋅CH2 O complexes, with the results of potential interest to atmospheric CH2 O chemistry.
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Affiliation(s)
- Timothy R Corkish
- School of Molecular Sciences, The University of Western Australia, Crawley, Western Australia, 6009, Australia
| | - Christian T Haakansson
- School of Molecular Sciences, The University of Western Australia, Crawley, Western Australia, 6009, Australia
| | - Peter D Watson
- School of Molecular Sciences, The University of Western Australia, Crawley, Western Australia, 6009, Australia
| | - Allan J McKinley
- School of Molecular Sciences, The University of Western Australia, Crawley, Western Australia, 6009, Australia
| | - Duncan A Wild
- School of Molecular Sciences, The University of Western Australia, Crawley, Western Australia, 6009, Australia
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Corkish TR, Haakansson CT, McKinley AJ, Wild DA. Evidence For a Water-Stabilised Ion Radical Complex: Photoelectron Spectroscopy and Ab Initio Calculations. Aust J Chem 2020. [DOI: 10.1071/ch19428] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
A photoelectron spectrum corresponding to an unknown 174m/z anion complex has been recorded. Initially believed to be I−…CH3CH2OH (173m/z), the spectrum has been assigned as belonging to that of an I−…H2O…CH3CH2 radical anion complex. The major peaks in the photoelectron spectrum occur at 3.54eV and 4.48eV as the 2P3/2 and 2P1/2 spin-orbit states of iodine respectively. Ab initio calculations were performed in order to rationalise the existence of the complex, with all structures converging to a ‘ring-like’ geometry, with the iodide anion bound to both the water molecule as well as a hydrogen of the ethyl radical, with the other hydrogen of water bound to the unpaired electron site of the ethyl. Simulated vertical detachment energies of 3.59eV and 4.53eV were found to be in agreement with the experimental results.
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Corkish TR, Haakansson CT, McKinley AJ, Wild DA. The Structure of CCl 5- in the Gas Phase. J Phys Chem Lett 2019; 10:5338-5342. [PMID: 31436999 DOI: 10.1021/acs.jpclett.9b02242] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
The first experimental evidence of the structure of the CCl5- gas-phase anion complex is presented in conjunction with results from high-level theoretical calculations. The photoelectron spectrum of the system shows a single peak with a maximum at 4.22 eV. Coupled cluster single double (triple) detachment energies of two stable C3v ion-molecule complexes of the form Cl-···CCl4 were also determined. The first complex found features the Cl- bound linearly in a Cl-···Cl-C bonding arrangement, while the second, less stable minimum has the Cl- positioned at the face of the CCl4 molecule, midway between three chlorine atoms. The calculated detachment energy for the first complex was found to be in excellent agreement with experiment, allowing the structure of CCl5- in the gas phase to be postulated as a noncovalent Cl-···CCl4 anion complex, with the Cl- anion tethered by a typical halogen bond.
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Affiliation(s)
- Timothy R Corkish
- School of Molecular Sciences , The University of Western Australia , Crawley 6009 , Western Australia , Australia
| | - Christian T Haakansson
- School of Molecular Sciences , The University of Western Australia , Crawley 6009 , Western Australia , Australia
| | - Allan J McKinley
- School of Molecular Sciences , The University of Western Australia , Crawley 6009 , Western Australia , Australia
| | - Duncan A Wild
- School of Molecular Sciences , The University of Western Australia , Crawley 6009 , Western Australia , Australia
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Lapere KML, McKinley AJ, Wild D. Anion Photoelectron Spectroscopy and High Level Ab Initio Calculations of the Halide–Nitric Oxide Dimer Complexes. Aust J Chem 2018. [DOI: 10.1071/ch17581] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Anion photoelectron spectra are presented for gas phase complexes formed between halide anions and nitric oxide, X−⋯NO where X− = Cl−, Br−, and I−. Electron binding energies are experimentally determined to be 3.82, 3.51, and 3.17 eV. Results from CCSD(T)/aug-cc-pVTZ calculations are presented for the anion species, whereby a single minimum of Cs symmetry is predicted. Binding energies (D0) of 15.3, 13.3, and 11.7 kJ mol−1 are predicted from complete basis set limit extrapolation, and are found to be in line with previous experimental studies.
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