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McCarver GA, Hinde RJ. High Accuracy Ab Initio Potential Energy Curves and Dipole Moment Functions for the X1Σ + and a3Π Spin States of the CF + Diatomic Molecule. J Phys Chem A 2024; 128:539-547. [PMID: 38227217 DOI: 10.1021/acs.jpca.3c04517] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2024]
Abstract
Potential energy curves and dipole moment functions constructed using high-accuracy ab initio methods allow for an in-depth examination of the electronic structure of diatomic molecules. Ab initio computations serve as a valuable complement to experimental data, offering insights into the nature of short-lived molecules such as those encountered within the interstellar medium (ISM). While laboratory experiments provide critical groundwork, the ISM's conditions often permit longer lifetimes for lower stability molecules, enabling unique observations. The CF+ diatomic molecule is one such molecule that has been observed spectroscopically in the ISM. Previous experimental and theoretical work have examined different spectroscopic aspects of the CF+ molecule, but the development of newer, more complete potential energy curves and dipole moment functions allows for even greater insight. We constructed both potential energy curves and dipole moment functions for the ground X1Σ+ and first excited a3Π states of CF+ for both the 12C and 13C isotopologues. The potential energy curves were constructed using coupled cluster with single, double, and perturbative triple excitations (CCSD(T)) at the complete basis set limit with corrections from full triple, quadruple, quintuple, and hextuple excitations within a finite-basis coupled cluster wave function as well as corrections from full configuration interaction and relativistic effects. Rovibrational wave functions were calculated using a vibrational Hamiltonian matrix, which moves beyond the harmonic oscillator approximation. The equilibrium bond length, vibrational constant, and rotational constant were reproduced to within 0.00013 Å, 0.28 cm-1, and 0.00045 cm-1, respectively, of experimental values. Experimental transition energies from rovibrational spectra were reproduced with an error of no larger than 0.63 cm-1. The triplet excited state (a3Π) was found to have a longer equilibrium bond length at 1.21069 Å, a vibrational constant of 1611.29 cm-1, and a rotational constant of 1.56376 cm-1. Rovibrational line lists for the 12C and 13C isotopologues for both the X1Σ+ and the excited a3Π states were generated.
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Affiliation(s)
- Gavin A McCarver
- Department of Chemistry, University of Tennessee, Knoxville, Tennessee 37996-1320, United States
| | - Robert J Hinde
- Department of Chemistry, University of Tennessee, Knoxville, Tennessee 37996-1320, United States
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Jacovella U, Ruscic B, Chen NL, Le HL, Boyé-Péronne S, Hartweg S, Chowdhury MR, Garcia GA, Loison JC, Gans B. Refining the thermochemical properties of CF, SiF, and their cations by combining photoelectron spectroscopy, quantum chemical calculations, and the Active Thermochemical Tables approach. Phys Chem Chem Phys 2023; 25:30838-30847. [PMID: 37877862 DOI: 10.1039/d3cp04244h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2023]
Abstract
Fluorinated species have a pivotal role in semiconductor material chemistry and some of them have been detected beyond the Earth's atmosphere. Achieving good energy accuracy on fluorinated species using quantum chemical calculations has long been a challenge. In addition, obtaining direct experimental thermochemical quantities has also proved difficult. Here, we report the threshold photoelectron and photoion yield spectra of SiF and CF radicals generated with a fluorine reactor. The spectra were analysed with the support of ab initio calculations, resulting in new experimental values for the adiabatic ionisation energies of both CF (9.128 ± 0.006 eV) and SiF (7.379 ± 0.009 eV). Using these values, the underlying thermochemical network of Active Thermochemical Tables was updated, providing further refined enthalpies of formation and dissociation energies of CF, SiF, and their cationic counterparts.
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Affiliation(s)
- Ugo Jacovella
- Université Paris-Saclay, CNRS, Institut des Sciences Moléculaires d'Orsay, 91405 Orsay, France.
| | - Branko Ruscic
- Chemical Sciences and Engineering Division, Argonne National Laboratory, Lemont, Illinois 60439, USA.
| | - Ning L Chen
- Université Paris-Saclay, CNRS, Institut des Sciences Moléculaires d'Orsay, 91405 Orsay, France.
| | - Hai-Linh Le
- Université Paris-Saclay, CNRS, Institut des Sciences Moléculaires d'Orsay, 91405 Orsay, France.
| | - Séverine Boyé-Péronne
- Université Paris-Saclay, CNRS, Institut des Sciences Moléculaires d'Orsay, 91405 Orsay, France.
| | - Sebastian Hartweg
- Synchrotron SOLEIL, L'Orme des Merisiers, 91192 Saint Aubin, Gif-sur-Yvette, France
| | | | - Gustavo A Garcia
- Synchrotron SOLEIL, L'Orme des Merisiers, 91192 Saint Aubin, Gif-sur-Yvette, France
| | | | - Bérenger Gans
- Université Paris-Saclay, CNRS, Institut des Sciences Moléculaires d'Orsay, 91405 Orsay, France.
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Sandoval L, Amero JM, Vazquez GJ, Palma A. Franck-Condon factors using supervised artificial neural networks. I. The CF+ cation. J Mol Model 2014; 20:2300. [PMID: 24881002 DOI: 10.1007/s00894-014-2300-y] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2014] [Accepted: 05/07/2014] [Indexed: 11/26/2022]
Abstract
Several studies of the electronic and vibrational structure of CF(+) have been performed since this molecule was first discovered to occur in the interstellar medium, and even before that. However, researchers have paid little attention to calculating its Franck-Condon factors (FCFs), which can aid the identification of this molecule through comparison with the observed intensity spectrum. In this work, an analysis of all of the potential energy curves of CF(+) that were candidates for this kind of calculation was undertaken. The Franck-Condon factors of CF(+) were calculated using a supervised neural network with two layers and a variable learning rate.
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Affiliation(s)
- Lourdes Sandoval
- Facultad de Ciencias de la Computación, BUAP, Puebla, Pue., 72570, México,
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Benidar A, Georges R, Guillemin J, Mó O, Yáñez M. Infrared Spectra of Cyanoacetaldehyde (NCCH
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CHO): A Potential Prebiotic Compound of Astrochemical Interest. Chemphyschem 2013; 14:2764-71. [DOI: 10.1002/cphc.201300354] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2013] [Indexed: 11/10/2022]
Affiliation(s)
- Abdessamad Benidar
- Institut de Physique de Rennes, CNRS UMR 6251, Université de Rennes 1, 35042 Rennes (France)
| | - Robert Georges
- Institut de Physique de Rennes, CNRS UMR 6251, Université de Rennes 1, 35042 Rennes (France)
| | - Jean‐Claude Guillemin
- Institut des Sciences Chimiques de Rennes, École Nationale Supérieure de Chimie de Rennes, CNRS, UMR 6226, Avenue du Général Leclerc, CS 50837, 35708 Rennes Cedex 7 (France)
| | - Otilia Mó
- Departamento de Quimica, Modulo 13, Universidad Autonoma de Madrid, Campus de Excelencia UAM‐CSIC, Cantoblanco, 28049‐Madrid (Spain)
| | - Manuel Yáñez
- Departamento de Quimica, Modulo 13, Universidad Autonoma de Madrid, Campus de Excelencia UAM‐CSIC, Cantoblanco, 28049‐Madrid (Spain)
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Wu YJ, Chen HF, Chou SL, Lin MY, Cheng BM. Vacuum-ultraviolet photolysis of H3CF in solid neon: Infrared spectra of HCF and CF+. Chem Phys Lett 2010. [DOI: 10.1016/j.cplett.2010.07.087] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Inostroza N, Letelier J, Senent M. On the numerical determination of Dunham’s coefficients: An application to X1Σ+HCl isotopomers. ACTA ACUST UNITED AC 2010. [DOI: 10.1016/j.theochem.2010.01.037] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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