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Affiliation(s)
- J.-M. Mestdagh
- a Laboratoire Francis Perrin (CNRS-URA-2453) , DSM/DRECAM/Service des Photons , Atomes et Molécules, C.E.A. Saclay, Gif-sur-Yvette cedex , F-91191 , France
| | - B. Soep
- a Laboratoire Francis Perrin (CNRS-URA-2453) , DSM/DRECAM/Service des Photons , Atomes et Molécules, C.E.A. Saclay, Gif-sur-Yvette cedex , F-91191 , France
| | - M.-A. Gaveau
- a Laboratoire Francis Perrin (CNRS-URA-2453) , DSM/DRECAM/Service des Photons , Atomes et Molécules, C.E.A. Saclay, Gif-sur-Yvette cedex , F-91191 , France
| | - J.-P. Visticot
- a Laboratoire Francis Perrin (CNRS-URA-2453) , DSM/DRECAM/Service des Photons , Atomes et Molécules, C.E.A. Saclay, Gif-sur-Yvette cedex , F-91191 , France
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Koput J, Makarewicz J. Ab initio characterization of the Ca-HCl van der Waals complex. J Chem Phys 2010; 132:064307. [PMID: 20151743 DOI: 10.1063/1.3318467] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
The equilibrium structure and three-dimensional potential energy surface of the Ca-HCl van der Waals complex in its ground electronic state have been determined from accurate ab initio calculations using the coupled-cluster method, CCSD(T), in conjunction with basis sets of quadruple- and quintuple-zeta quality. The core-electron correlation, high-order valence-electron correlation, and scalar relativistic effects were investigated. The Ca-HCl complex was confirmed to be linear at equilibrium, with the vibrationless dissociation energy (into Ca and HCl) D(e) of 287 cm(-1). The vibration-rotation energy levels of various Ca-HCl isotopomers were predicted using the variational method. The predicted spectroscopic constants can be useful in a further analysis of high-resolution vibration-rotation spectra of the Ca-HCl complex.
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Affiliation(s)
- Jacek Koput
- Department of Chemistry, Adam Mickiewicz University, Poznań 60-780, Poland.
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Sanz C, van der Avoird A, Roncero O. Collisional and photoinitiated reaction dynamics in the ground electronic state of Ca-HCl. J Chem Phys 2005; 123:64301. [PMID: 16122302 DOI: 10.1063/1.1995700] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Ca+HCl(upsilon,j) reactive collisions were studied for different rovibrational states of the HCl reactant using wave-packet calculations in reactant Jacobi coordinates. A recently proposed potential-energy surface was used with a barrier of approximately 0.4 eV followed by a deep well. The possibility of an insertion mechanism due to this last well has been analyzed and it was found that once the wave packet passes over the barrier most of it goes directly to CaCl+H products, which shows that the reaction dynamics is essentially direct. It was also found that there is no significant change in the reaction efficiency as a function of the initial HCl rovibrational state, because CaHCl at the barrier has an only little elongated HCl bond. Near the threshold for reaction with HCl(upsilon=0), however, the reaction shows significant steric effects for j > 0. In a complementary study, the infrared excitation from the Ca-HCl van der Waals well was simulated. The spectrum thus obtained shows several series of resonances which correspond to quasibound states correlating to excited HCl(upsilon) vibrations. The Ca-HCl binding energies of these quasibound states increase dramatically with upsilon, from 75 to 650 cm(-1), because the wave function spreads increasingly over larger HCl bond lengths. Thus it explores the region of the barrier saddle point and the deep insertion well. Although also the charge-transfer contribution increases with upsilon, the reaction probability for resonances of the upsilon=2 manifold, which are well above the reaction threshold, is still negligible. This explains the relatively long lifetimes of these upsilon=2 resonances. The reaction probability becomes significant at upsilon=3. Our simulations have shown that an experimental study of this type will allow a gradual spectroscopic probing of the barrier for the reaction.
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Affiliation(s)
- Cristina Sanz
- Instituto de Matemáticas y Física Fundamental, Consejo Superior de Investigaciones Científicas (CSIC), Serrano 123, 28006 Madrid, Spain
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Verbockhaven G, Sanz C, Groenenboom GC, Roncero O, van der Avoird A. Ab initiopotential-energy surface for the reaction Ca+HCl→CaCl+H. J Chem Phys 2005; 122:204307. [PMID: 15945724 DOI: 10.1063/1.1899154] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
The potential-energy surface of the ground electronic state of CaHCl has been obtained from 6400 ab initio points calculated at the multireference configuration-interaction level and represented by a global analytical fit. The Ca+HCl-->CaCl+H reaction is endothermic by 5100 cm(-1) with a barrier of 4470 cm(-1) at bent geometry, taking the zero energy in the Ca+HCl asymptote. On both sides of this barrier are potential wells at linear geometries, a shallow one due to van der Waals interactions in the entrance channel, and a deep one attributed to the H(-)Ca(++)Cl(-) ionic configuration. The accuracy of the van der Waals well depth, approximately 200 cm(-1), was checked by means of additional calculations at the coupled-cluster singles and doubles with perturbative triples level and it was concluded that previous empirical estimates are unrealistic. Also, the electric dipole function was calculated, analytically fitted in the regions of the two wells, and used to analyze the charge shifts along the reaction path. In the insertion well, 16,800 cm(-1) deep, the electric dipole function confirmed the ionic structure of the HCaCl complex and served to estimate effective atomic charges. Finally, bound rovibrational levels were computed both in the van der Waals well and in the insertion well, and the infrared-absorption spectrum of the insertion complex was simulated in order to facilitate its detection.
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Affiliation(s)
- Gilles Verbockhaven
- Institute of Theoretical Chemistry, Institute for Molecules and Materials, University of Nijmegen, Toernooiveld 1, 6525 ED Nijmegen, The Netherlands
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Briant M, Fournier PR, Gaveau MA, Mestdagh JM, Soep B, Visticot JP. Excited state reactions of metals on clusters: Full dynamics of the Ca*+HBr reaction on Ar2000. J Chem Phys 2002. [DOI: 10.1063/1.1498472] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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De Castro M, Candori R, Pirani F, Aquilanti V, Garay M, González Ureña A. Chemiluminescent reactions of excited calcium atoms with HCl and HBr: Selective charge-transfer “harpooning” and synchronized intermediate complex rearrangement. J Chem Phys 2000. [DOI: 10.1063/1.480607] [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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De Castro M, Candori R, Pirani F, Aquilanti V, Garay M, Ureña AG. Translational Energy Effects in the Ca*(1D2) + HBr → CaBr*(A,B) Reaction. Experimental Evidence of Synchronization between Electron Transfer and Rearrangement of the Intermediate Complex. J Phys Chem A 1998. [DOI: 10.1021/jp982085k] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Miguel De Castro
- Dipartimento di Chimica, Università di Perugia I-06123 Perugia, Italy, and Unidad de Laseres y Haces Moleculares, Instituto PluridisciplinarUniversidad Complutense de Madrid, 28040 Madrid, Spain
| | - Roberto Candori
- Dipartimento di Chimica, Università di Perugia I-06123 Perugia, Italy, and Unidad de Laseres y Haces Moleculares, Instituto PluridisciplinarUniversidad Complutense de Madrid, 28040 Madrid, Spain
| | - Fernando Pirani
- Dipartimento di Chimica, Università di Perugia I-06123 Perugia, Italy, and Unidad de Laseres y Haces Moleculares, Instituto PluridisciplinarUniversidad Complutense de Madrid, 28040 Madrid, Spain
| | - Vincenzo Aquilanti
- Dipartimento di Chimica, Università di Perugia I-06123 Perugia, Italy, and Unidad de Laseres y Haces Moleculares, Instituto PluridisciplinarUniversidad Complutense de Madrid, 28040 Madrid, Spain
| | - Macarena Garay
- Dipartimento di Chimica, Università di Perugia I-06123 Perugia, Italy, and Unidad de Laseres y Haces Moleculares, Instituto PluridisciplinarUniversidad Complutense de Madrid, 28040 Madrid, Spain
| | - Angel González Ureña
- Dipartimento di Chimica, Università di Perugia I-06123 Perugia, Italy, and Unidad de Laseres y Haces Moleculares, Instituto PluridisciplinarUniversidad Complutense de Madrid, 28040 Madrid, Spain
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Lawruszczuk R, Elhanine M, Soep B. Selective excitation of the ion pair surface in the intracluster Ca–HCl* harpoon reaction. J Chem Phys 1998. [DOI: 10.1063/1.476265] [Citation(s) in RCA: 23] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Skowronek S, Pereira R, González Ureña A. Spectroscopy and Dynamics of Excited Harpooning Reactions: The Photodepletion Action Spectrum of the Ba···FCH3 Complex. J Phys Chem A 1997. [DOI: 10.1021/jp970385g] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- S. Skowronek
- Unidad de Laseres y Haces Moleculares, Instituto Pluridisciplinar, Universidad Complutense de Madrid, Juan XXIII, 1, 28040 Madrid, Spain
| | - R. Pereira
- Unidad de Laseres y Haces Moleculares, Instituto Pluridisciplinar, Universidad Complutense de Madrid, Juan XXIII, 1, 28040 Madrid, Spain
| | - A. González Ureña
- Unidad de Laseres y Haces Moleculares, Instituto Pluridisciplinar, Universidad Complutense de Madrid, Juan XXIII, 1, 28040 Madrid, Spain
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Bond stabilization by charge transfer: the transition from Van der Waals forces to the simplest chemical bonds. Chem Phys Lett 1997. [DOI: 10.1016/s0009-2614(97)00487-9] [Citation(s) in RCA: 51] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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