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Copeland G, Lee EPF, Dyke JM, Chow WK, Mok DKW, Chau FT. Study of 2-H-Heptafluoropropane and Its Thermal Decomposition Using UV Photoelectron Spectroscopy and ab Initio Molecular Orbital Calculations. J Phys Chem A 2010; 114:3540-50. [DOI: 10.1021/jp1000607] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- G. Copeland
- School of Chemistry, University of Southampton, Highfield, Southampton SO17 1BJ, United Kingdom, Department of Applied Biology and Chemical Technology, The Hong Kong Polytechnic University, Hung Hom, Hong Kong, and Department of Building Services Engineering, The Hong Kong Polytechnic University, Hung Hom, Hong Kong
| | - E. P. F. Lee
- School of Chemistry, University of Southampton, Highfield, Southampton SO17 1BJ, United Kingdom, Department of Applied Biology and Chemical Technology, The Hong Kong Polytechnic University, Hung Hom, Hong Kong, and Department of Building Services Engineering, The Hong Kong Polytechnic University, Hung Hom, Hong Kong
| | - J. M. Dyke
- School of Chemistry, University of Southampton, Highfield, Southampton SO17 1BJ, United Kingdom, Department of Applied Biology and Chemical Technology, The Hong Kong Polytechnic University, Hung Hom, Hong Kong, and Department of Building Services Engineering, The Hong Kong Polytechnic University, Hung Hom, Hong Kong
| | - W. K. Chow
- School of Chemistry, University of Southampton, Highfield, Southampton SO17 1BJ, United Kingdom, Department of Applied Biology and Chemical Technology, The Hong Kong Polytechnic University, Hung Hom, Hong Kong, and Department of Building Services Engineering, The Hong Kong Polytechnic University, Hung Hom, Hong Kong
| | - D. K. W. Mok
- School of Chemistry, University of Southampton, Highfield, Southampton SO17 1BJ, United Kingdom, Department of Applied Biology and Chemical Technology, The Hong Kong Polytechnic University, Hung Hom, Hong Kong, and Department of Building Services Engineering, The Hong Kong Polytechnic University, Hung Hom, Hong Kong
| | - F. T. Chau
- School of Chemistry, University of Southampton, Highfield, Southampton SO17 1BJ, United Kingdom, Department of Applied Biology and Chemical Technology, The Hong Kong Polytechnic University, Hung Hom, Hong Kong, and Department of Building Services Engineering, The Hong Kong Polytechnic University, Hung Hom, Hong Kong
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Mikhailov VA, Parkes MA, Simpson MJ, Tuckett RP, Mayhew CA. Selected ion flow tube study of the ion-molecule reactions of monochloroethene, trichloroethene, and tetrachloroethene. J Phys Chem A 2008; 112:9012-22. [PMID: 18754602 DOI: 10.1021/jp804443v] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Data for the rate coefficients and product cations of the reactions of a large number of atomic and small molecular cations with monochloroethene, trichloroethene, and tetrachloroethene in a selected ion flow tube at 298 K are reported. The recombination energy of the ions range from 6.27 (H3O(+)) through to 21.56 (Ne(+)) eV. Collisional rate coefficients are calculated by modified average dipole orientation theory and compared with experimental values. Thermochemistry and mass balance predict the most feasible neutral products. Together with previously reported results for the three isomers of dichloroethene ( Mikhailov, V. A. ; Parkes, M. A. ; Tuckett, R. P. ; Mayhew, C. A. J. Phys. Chem. A 2006, 110, 5760 ), the fragment ion branching ratios have been compared with those from threshold photoelectron photoion coincidence spectroscopy over the photon energy range of 9-22 eV to determine the importance or otherwise of long-range charge transfer. For ions with recombination energy in excess of the ionization energy of the chloroethene, charge transfer is energetically allowed. The similarity of the branching ratios from the two experiments suggest that long-range charge transfer is dominant. For ions with recombination energy less than the ionization energy, charge transfer is not allowed; chemical reaction can only occur following formation of an ion-molecule complex, where steric effects are more significant. The products that are now formed and their percentage yields are a complex interplay between the number and position of the chlorine atoms with respect to the C=C bond, where inductive and conjugation effects can be important.
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Affiliation(s)
- Victor A Mikhailov
- School of Physics and Astronomy, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK
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Limão-Vieira P, Duflot D, Giuliani A, Vasekova E, Lourenço JMC, Santos PM, Hoffmann SV, Mason NJ, Delwiche J, Hubin-Franskin MJ. Electronic state spectroscopy of c-C5F8 explored by photoabsorption, electron impact, photoelectron spectroscopies and ab initio calculations. J Phys Chem A 2008; 112:2782-93. [PMID: 18331010 DOI: 10.1021/jp7107939] [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 electronic transitions and resonance-enhanced vibrational excitations of octafluorocyclopentene (c-C5F8) have been investigated using high-resolution photoabsorption spectroscopy in the energy range 6-11 eV. In addition, the high-resolution electron energy loss spectrum (HREELS) was recorded under the electric dipolar excitation conditions (100 eV incident energy, approximately 0 degrees scattering angle) over the 5-14 eV energy loss range. A He(I) photoelectron spectrum (PES) has also been recorded between 11 and 20 eV, allowing us to derive a more precise value of (11.288 +/- 0.002) eV for the ground neutral state adiabatic ionization energy. All spectra presented in this paper represent the first and highest resolution data yet reported for octafluorocyclopentene. Ab initio calculations have been performed for helping in the assignment of the spectral bands for both neutral excited states and ionic states.
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Affiliation(s)
- P Limão-Vieira
- Laboratório de Colisões Atómicas e Moleculares, Departamento de Física, CEFITEC, Universidade Nova de Lisboa, P-2829-516 Caparica, Portugal.
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