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Gloaguen E, Sanz Sanz C, Collier M, Gaveau MA, Soep B, Roncero O, Mestdagh JM. Transition-state spectroscopy of the photoinduced Ca + CH3F reaction. 3. Reaction following the local excitation to Ca(4s3d 1D). J Phys Chem A 2008; 112:1408-20. [PMID: 18232672 DOI: 10.1021/jp077664g] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The Ca* + CH3F --> CaF* + CH3 reaction was studied both experimentally and theoretically. The reaction was photoinduced in Ca...CH3F complexes, which were illuminated by a tunable laser in the range 18 000-24 000 cm-1. The absorption band that leads to the reaction extends between 19 000 and 23 000 cm-1. It is formed of three broad overlapping structures corresponding to the excitation of different electronic states of the complex. The two structures of lowest energy were considered in detail. They are associated with two series of respectively 2 and 3 molecular states correlating to Ca(4s3d 1D) + CH3F at infinite separation between Ca and CH3F. The assignment of these structures to specific electronic transitions of the complex stemmed from theoretical calculations where the Ca...CH3F complex is described by a linear Ca-F-C backbone. 2D potential energy surfaces were calculated by associating a pseudopotential description of the [Ca2+] and [F7+] cores, a core polarization operator on calcium, an extensive Gaussian basis, and a treatment of the electronic problem at the CI-MRCI level. All the excited levels correlating to the 4s2 1S, 4s3d 1D, and 4s4p 1P levels of Ca in the Ca + CH3F channel were documented in a calculation that explored the rearrangement channels where either Ca + CH3F or CaF + CH3 are formed. Then, wavepacket calculations on the 2D-PES's allowed one to simulate the absorption spectrum of the complex, in an approximation where the various electronic states of the complex are not coupled together. The assignment above stemmed from this. The second outcome of the calculation was that whatever the excited level of the complex that is considered, the reaction has to proceed through energy barriers. The electronic excitation of the complex on the red side of the absorption band does not seem to deposit enough energy in the system to overcome these barriers (even the lowest one) or to stimulate tunneling reactions. An alternative reaction mechanism involving a transfer to triplet PES's is proposed.
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Affiliation(s)
- E Gloaguen
- Laboratoire Francis Perrin (CNRS-URA-2453), DSM/IRAMIS/Service des Photons, Atomes et Molécules, C.E.A. Saclay, F-91191 Gif-sur-Yvette cedex, France
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Transition state spectroscopy of open shell systems: Angle-resolved photodetachment spectra for the adiabatic singlet states of OHF. J Photochem Photobiol A Chem 2007. [DOI: 10.1016/j.jphotochem.2007.01.027] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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Mestdagh JM, Spiegelman F, Gloaguen E, Collier M, Lepetit F, Gaveau MA, Sanz CS, Soep B. Transition State Spectroscopy of the Photoinduced Ca + CH3F Reaction. 2. Experimental and Ab Initio Studies of the Free Ca···FCH3 Complex. J Phys Chem A 2006; 110:7355-63. [PMID: 16759123 DOI: 10.1021/jp057483j] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The Ca* + CH3F --> CaF + CH3 reaction was photoinduced in 1:1 Ca...CH3F complexes formed in a supersonic expansion. The transition state of the reaction was explored by monitoring the electronically excited product, CaF, while scanning the laser that turns on the reaction. Moreover, the electronic structure of the Ca...FCH3 system was studied using ab initio methods by associating a pseudopotential description of the [Ca2+] and [F7+] cores, a core polarization operator on calcium, an extensive Gaussian basis and a treatment of the electronic problem at the CCSD(T) (ground state) and RSPT2 (excited states) level. In this contribution we present experimental results for the free complex and a comparison with the results of a previous experiment where the Ca...CH3F complexes are deposited at the surface of large argon clusters. The ab initio calculations allowed an interpretation of the experimental data in terms of two reaction mechanisms, one involving a partial charge transfer state, the other involving the excitation of the C-F stretch in the CH3F moiety prior to charge transfer.
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Affiliation(s)
- J-M Mestdagh
- Laboratoire Francis Perrin (CNRS-URA-2453), DSM/DRECAM/Service des Photons, Atomes et Molécules, CEA Saclay, F-91191 Gif-sur-Yvette Cedex, France
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Gaveau MA, Gloaguen E, Fournier PR, Mestdagh JM. Transition State Spectroscopy of the Photoinduced Ca + CH3F Reaction. 1. A Cluster Isolated Chemical Reaction Study. J Phys Chem A 2005; 109:9494-8. [PMID: 16866399 DOI: 10.1021/jp053128h] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The "cluster isolated chemical reactions" technique is used to examine the dynamics of the photoinduced reaction producing electronically excited CaF when 1:1 Ca-CH(3)F complexes are deposited at the surface of large argon clusters. This technique ensures quantitatively that 1:1 complexes are actually at the origin of the observed signals. The reaction is monitored by observing the CaF chemiluminescence while scanning the photoexcitation laser. The resulting action spectrum contains information about the absorption bands of the complex, filtered by the dynamics of the reaction. The observations suggest a profound alteration of the calcium electronic structure and a control of the reaction by the CF stretch in CH(3)F.
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Affiliation(s)
- M-A Gaveau
- Laboratoire Francis Perrin (CNRS-URA-2453), DSM/DRECAM/Service des Photons, Atomes et Molécules, C.E.A. Saclay, F-91191 Gif-sur-Yvette Cedex, France
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McGuire MJ, Piecuch P, Kowalski K, Kucharski SA, Musiał M. Renormalized Coupled-Cluster Calculations of Reactive Potential Energy Surfaces: The BeFH System. J Phys Chem A 2004. [DOI: 10.1021/jp048880h] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Michael J. McGuire
- Department of Chemistry, Michigan State University, East Lansing, Michigan 48824, and Institute of Chemistry, University of Silesia, Szkolna 9, 40-006 Katowice, Poland
| | - Piotr Piecuch
- Department of Chemistry, Michigan State University, East Lansing, Michigan 48824, and Institute of Chemistry, University of Silesia, Szkolna 9, 40-006 Katowice, Poland
| | - Karol Kowalski
- Department of Chemistry, Michigan State University, East Lansing, Michigan 48824, and Institute of Chemistry, University of Silesia, Szkolna 9, 40-006 Katowice, Poland
| | - Stanisław A. Kucharski
- Department of Chemistry, Michigan State University, East Lansing, Michigan 48824, and Institute of Chemistry, University of Silesia, Szkolna 9, 40-006 Katowice, Poland
| | - Monika Musiał
- Department of Chemistry, Michigan State University, East Lansing, Michigan 48824, and Institute of Chemistry, University of Silesia, Szkolna 9, 40-006 Katowice, Poland
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Aguado A, Paniagua M, Sanz C, Roncero O. Transition state spectroscopy of the excited electronic states of Li–HF. J Chem Phys 2003. [DOI: 10.1063/1.1618223] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Gasmi K, Skowronek S, González Ureña A. Quantum interferences in the Ba⋯FCH3(B)+hν→BaF+CH3 intracluster reaction. Chem Phys Lett 2003. [DOI: 10.1016/s0009-2614(03)00992-8] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Bound and quasi-bound states of the Li⋯FH van der Waals molecule: The effects of the potential energy surface and of the basis set superposition error. ACTA ACUST UNITED AC 2002. [DOI: 10.1016/s0166-1280(02)00219-1] [Citation(s) in RCA: 10] [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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González Ureña A, Gasmi K, Jiménez J, Lobo R. Excitation laser fluence effects on the Ba⋯FCH3+hν→BaF+CH3 intracluster reaction. Chem Phys Lett 2002. [DOI: 10.1016/s0009-2614(01)01481-6] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Aguado A, Lara M, Paniagua M, Roncero O. Exploring the transition state for the Li+HF→LiF+H reaction through the A←X absorption spectrum and X←A stimulated emission pumping. J Chem Phys 2001. [DOI: 10.1063/1.1340564] [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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Mrugała F, Piecuch P, Špirko V, Bludský O. Lifetimes and dissociation pathways of the quasi-bound states of the Na⋯FH van der Waals molecule. J Mol Struct 2000. [DOI: 10.1016/s0022-2860(00)00586-x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Paniagua M, Aguado A, Lara M, Roncero O. Transition state spectroscopy via infrared excitation of Li⋯HF and Li⋯DF van der Waals precursors. J Chem Phys 1999. [DOI: 10.1063/1.480040] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
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Skowronek S, Jiménez JB, González Ureña A. Resonances in the Ba…FCH3+hν→BaF+CH3 reaction probability. J Chem Phys 1999. [DOI: 10.1063/1.479326] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Spectroscopy and dynamics of van der Waals reactions: the Ba⋯FCH3∗ photofragmentation channels. Chem Phys Lett 1999. [DOI: 10.1016/s0009-2614(99)00228-6] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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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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Pereira R, Skowronek S, González Ureña A. The photodepletion action spectrum of the (BaF)2 cluster. J Chem Phys 1998. [DOI: 10.1063/1.475842] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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