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Wilhelm MJ, Nikow M, Smith JM, Dai HL. Collisional Energy Transfer from Highly Vibrationally Excited Radicals Is Very Efficient. J Phys Chem Lett 2013; 4:23-29. [PMID: 26291206 DOI: 10.1021/jz301761e] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Although highly vibrationally excited (HVE) radicals are ubiquitous in natural environments, the effect of collisional energy transfer (ET) on their reactivity has yet to be fully characterized. We have used time-resolved IR emission spectroscopy to characterize the vibrational-to-translational quenching of a small HVE radical, ketenyl (HCCO), by inert gases. Photolysis of ethyl ethynyl ether at 193 nm provides HVE HCCO in the X̃(2)A″ electronic ground-state, with a nascent internal energy of 2.2 ± 0.6 eV. IR emission is monitored as an indicator of vibrational energy, and spectral modeling allows direct determination of the average energy lost per collision as a function of the internal energy. Collisional deactivation of HVE HCCO is shown to be minimally an order of magnitude more efficient than closed-shell molecules of comparable size. Schwartz-Slawsky-Herzfeld-Tanczos (SSHT) theory, modified for HVE molecules, suggests that this ET enhancement is due to a strong attractive intermolecular interaction.
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Affiliation(s)
- Michael J Wilhelm
- †Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States
| | - Matthew Nikow
- †Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States
| | - Jonathan M Smith
- ‡Department of Chemistry, Temple University, Philadelphia, Pennsylvania 19122, United States
| | - Hai-Lung Dai
- ‡Department of Chemistry, Temple University, Philadelphia, Pennsylvania 19122, United States
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Cargnoni F, Mella M, Raimondi M. Application of valence-bond techniques to the study of weakly bound complexes. The potential energy surface of the Ne–CH4system. Phys Chem Chem Phys 2007; 9:2457-69. [PMID: 17508080 DOI: 10.1039/b700143f] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We present a comprehensive survey of the Molecular Orbital-Valence Bond (MO-VB) method, a theoretical scheme developed within the framework of the Valence Bond theory to deal with weakly bound intermolecular complexes. According to the MO-VB, the wavefunction of the system is expressed as a truncated non-orthogonal Configuration Interaction expansion, which is size extensive and a priori free of basis set superposition error. We report on the recent developments of the method, which extend the range of application of the MO-VB to intermolecular complexes with a quite large number of correlated electrons, showing that VB-based methods are nowadays a valid alternative to Molecular Orbital approaches also in this field. The MO-VB has been applied to study extensively the Ne-CH(4) complex, and compared with the more standard MP4 and CCSD(T) results. We determined two analytical Potential Energy Surfaces (PES) for this system, computed at MO-VB and MP4 level, which represent the first ones coming entirely from ab initio computations. The features of our potentials are discussed, and compared to the single analytical potential which includes the anisotropy available in the literature, determined about twenty years ago by Udo Buck and co-workers using a semiempirical approach [U. Buck, A. Kolhase, D. Secrest, T. Phillips, G. Scoles and F. Grein, Mol. Phys., 1985, 55, 1233]. The differences among the three PES are quite relevant, and are due to play a relevant role in the theoretical simulations of the dynamical properties of the Ne-CH(4) system.
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Affiliation(s)
- F Cargnoni
- ISTM-CNR, Via Golgi 19, 20133 Milano, Italy.
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Cappelletti D, Bartolomei M, Pirani F, Aquilanti V. Molecular Beam Scattering Experiments on Benzene−Rare Gas Systems: Probing the Potential Energy Surfaces for the C6H6−He, −Ne, and −Ar Dimers. J Phys Chem A 2002. [DOI: 10.1021/jp0202486] [Citation(s) in RCA: 76] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- D. Cappelletti
- INFM and Dipartimento di Ingegneria Civile ed Ambientale, Università di Perugia, 06125, Perugia, Italy
| | - M. Bartolomei
- INFM and Dipartimento di Chimica, Università di Perugia, 06123, Perugia, Italy
| | - F. Pirani
- INFM and Dipartimento di Chimica, Università di Perugia, 06123, Perugia, Italy
| | - V. Aquilanti
- INFM and Dipartimento di Chimica, Università di Perugia, 06123, Perugia, Italy
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Aquilanti V, Ascenzi D, Cappelletti D, de Castro M, Pirani F. Scattering of aligned molecules. The potential energy surfaces for the Kr-O2 and Xe-O2 systems. J Chem Phys 1998. [DOI: 10.1063/1.476989] [Citation(s) in RCA: 79] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Aquilanti V, Ascenzi D, Braca E, Cappelletti D, Liuti G, Luzzatti E, Pirani F. Production, Characterization, and Scattering of a Beam of Sulfur Monoxide Radicals: The SO−Noble Gas Interactions. J Phys Chem A 1997. [DOI: 10.1021/jp970817n] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Vincenzo Aquilanti
- Dipartimento di Chimica dell'Università, Universita di Perugia, I-06123 Perugia, Italy, and Facoltà di Ingegneria, Istituto per le Tecnologie Chimiche, I-06123 Perugia, Italy
| | - Daniela Ascenzi
- Dipartimento di Chimica dell'Università, Universita di Perugia, I-06123 Perugia, Italy, and Facoltà di Ingegneria, Istituto per le Tecnologie Chimiche, I-06123 Perugia, Italy
| | - Elisabetta Braca
- Dipartimento di Chimica dell'Università, Universita di Perugia, I-06123 Perugia, Italy, and Facoltà di Ingegneria, Istituto per le Tecnologie Chimiche, I-06123 Perugia, Italy
| | - David Cappelletti
- Dipartimento di Chimica dell'Università, Universita di Perugia, I-06123 Perugia, Italy, and Facoltà di Ingegneria, Istituto per le Tecnologie Chimiche, I-06123 Perugia, Italy
| | - Giorgio Liuti
- Dipartimento di Chimica dell'Università, Universita di Perugia, I-06123 Perugia, Italy, and Facoltà di Ingegneria, Istituto per le Tecnologie Chimiche, I-06123 Perugia, Italy
| | - Emilio Luzzatti
- Dipartimento di Chimica dell'Università, Universita di Perugia, I-06123 Perugia, Italy, and Facoltà di Ingegneria, Istituto per le Tecnologie Chimiche, I-06123 Perugia, Italy
| | - Fernando Pirani
- Dipartimento di Chimica dell'Università, Universita di Perugia, I-06123 Perugia, Italy, and Facoltà di Ingegneria, Istituto per le Tecnologie Chimiche, I-06123 Perugia, Italy
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Heijmen TGA, Korona T, Moszynski R, Wormer PES, van der Avoird A. Ab initio potential-energy surface and rotationally inelastic integral cross sections of the Ar–CH4 complex. J Chem Phys 1997. [DOI: 10.1063/1.474388] [Citation(s) in RCA: 55] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Chapman WB, Schiffman A, Hutson JM, Nesbitt DJ. Rotationally inelastic scattering in CH4+He, Ne, and Ar: State‐to‐state cross sections via direct infrared laser absorption in crossed supersonic jets. J Chem Phys 1996. [DOI: 10.1063/1.472211] [Citation(s) in RCA: 41] [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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Cappelletti D, Liuti G, Luzzatti E, Pirani F. Characterization of a molecular beam containing metastable nitrogen and its use in scattering experiments with xenon. J Chem Phys 1994. [DOI: 10.1063/1.467815] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Hutson JM, Thornley AE. Atom‐spherical top van der Waals complexes: A theoretical study. J Chem Phys 1994. [DOI: 10.1063/1.466499] [Citation(s) in RCA: 39] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Nesbitt DJ, Nibler JW, Schiffman A, Chapman WB, Hutson JM. A new direct infrared laser absorption method for state‐to‐state rotational energy transfer in crossed supersonic jets: Experimental results and quantum scattering analysis for Ar+CH4. J Chem Phys 1993. [DOI: 10.1063/1.464382] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Aquilanti V, Cappelletti D, Pirani F. Magnetically selected beams of atomic chlorine: measurement of long-range features of the chlorine–hydrogen and chlorine–methane potential-energy surfaces. ACTA ACUST UNITED AC 1993. [DOI: 10.1039/ft9938901467] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Beneventi L, Casavecchia P, Pirani F, Vecchiocattivi F, Volpi GG, Brocks G, van der Avoird A, Heijmen B, Reuss J. The Ne–O2potential energy surface from high‐resolution diffraction and glory scattering experiments and from the Zeeman spectrum. J Chem Phys 1991. [DOI: 10.1063/1.461475] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Ohshima Y, Endo Y. Rotational spectrum and internal rotation of a methane–HCl complex. J Chem Phys 1990. [DOI: 10.1063/1.458995] [Citation(s) in RCA: 66] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Aquilanti V, Luzzatti E, Pirani F, Volpi GG. Molecular beam studies of weak interactions for open‐shell systems: The ground and lowest excited states of ArF, KrF, and XeF. J Chem Phys 1988. [DOI: 10.1063/1.455433] [Citation(s) in RCA: 93] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Aquilanti V, Candori R, Pirani F. Molecular beam studies of weak interactions for open‐shell systems: The ground and lowest excited states of rare gas oxides. J Chem Phys 1988. [DOI: 10.1063/1.455432] [Citation(s) in RCA: 86] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Liuti G, Pirani F. Molecular beam study of the interaction of atomic and molecular oxygen with methane. J Chem Phys 1987. [DOI: 10.1063/1.453669] [Citation(s) in RCA: 14] [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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