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Jiménez-Redondo M, Carrasco E, Herrero VJ, Tanarro I. Chemistry in glow discharges of H 2 / O 2 mixtures. Diagnostics and modelling. PLASMA SOURCES SCIENCE & TECHNOLOGY 2015; 24:015029. [PMID: 26702195 PMCID: PMC4685741 DOI: 10.1088/0963-0252/24/1/015029] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
The chemistry of low pressure H2 + O2 discharges with different mixture ratios has been studied in a hollow cathode DC reactor. Neutral and positive ion distributions have been measured by mass spectrometry, and Langmuir probes have been used to provide charge densities and electron temperatures. A simple zero order kinetic model including neutral species and positive and negative ions, which takes into account gas-phase and heterogeneous chemistry, has been used to reproduce the global composition of the plasmas over the whole range of mixtures experimentally studied, and allows for the identification of the main physicochemical mechanisms that may explain the experimental results. To our knowledge, no combined experimental and modelling studies of the heavy species kinetics of low pressure H2 + O2 plasmas including ions has been reported before. As expected, apart from the precursors, H2O is detected in considerable amounts. The model also predicts appreciable concentrations of H and O atoms and the OH radical. The relevance of the metastable species O(1D) and O2(a1Δg) is analysed. Concerning the charged species, positive ion distributions are dominated by H3O+ for a wide range of intermediate mixtures, while H3+ and O2+ are the major ions for the higher and lower H2/O2 ratios, respectively. The mixed ions OH+, H2O+ and HO2+ are also observed in small amounts. Negative ions are shown to have a limited relevance in the global chemistry; their main contribution is the reduction of the electron density available for electron impact processes.
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Affiliation(s)
- M Jiménez-Redondo
- Instituto de Estructura de la Materia (IEM-CSIC), Serrano 123, 28006 Madrid, Spain
| | - E Carrasco
- Instituto de Estructura de la Materia (IEM-CSIC), Serrano 123, 28006 Madrid, Spain
| | - V J Herrero
- Instituto de Estructura de la Materia (IEM-CSIC), Serrano 123, 28006 Madrid, Spain
| | - I Tanarro
- Instituto de Estructura de la Materia (IEM-CSIC), Serrano 123, 28006 Madrid, Spain
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Loison JC, Rayez MT, Rayez JC, Gratien A, Morajkar P, Fittschen C, Villenave E. Gas-Phase Reaction of Hydroxyl Radical with Hexamethylbenzene. J Phys Chem A 2012. [DOI: 10.1021/jp307568c] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Jean-Christophe Loison
- Universite Bordeaux, ISM, UMR 5255, F-33400
Talence, France
- CNRS, ISM, UMR 5255, F-33400 Talence, France
| | - Marie-Thérèse Rayez
- Universite Bordeaux, ISM, UMR 5255, F-33400
Talence, France
- CNRS, ISM, UMR 5255, F-33400 Talence, France
| | - Jean-Claude Rayez
- Universite Bordeaux, ISM, UMR 5255, F-33400
Talence, France
- CNRS, ISM, UMR 5255, F-33400 Talence, France
| | - Aline Gratien
- Universite Bordeaux, ISM, UMR 5255, F-33400
Talence, France
- CNRS, ISM, UMR 5255, F-33400 Talence, France
| | - Pranay Morajkar
- Universite Bordeaux, ISM, UMR 5255, F-33400
Talence, France
- CNRS, ISM, UMR 5255, F-33400 Talence, France
- Universite Lille, PC2A, UMR 8522, F-59655 Villeneuve d’Ascq, France
- CNRS,
PC2A, UMR 8522, F-59655 Villeneuve d’Ascq, France
| | - Christa Fittschen
- Universite Lille, PC2A, UMR 8522, F-59655 Villeneuve d’Ascq, France
- CNRS,
PC2A, UMR 8522, F-59655 Villeneuve d’Ascq, France
| | - Eric Villenave
- Universite Bordeaux, ISM, UMR 5255, F-33400
Talence, France
- CNRS, ISM, UMR 5255, F-33400 Talence, France
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Loison JC, Daranlot J, Bergeat A, Caralp F, Mereau R, Hickson KM. Gas-Phase Kinetics of Hydroxyl Radical Reactions with C3H6 and C4H8: Product Branching Ratios and OH Addition Site-Specificity. J Phys Chem A 2010; 114:13326-36. [DOI: 10.1021/jp107217w] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Jean-Christophe Loison
- Institut des Sciences Moléculaires, CNRS UMR 5255, Université Bordeaux I, 351 Cours de la Libération, 33405 Talence cedex, France
| | - Julien Daranlot
- Institut des Sciences Moléculaires, CNRS UMR 5255, Université Bordeaux I, 351 Cours de la Libération, 33405 Talence cedex, France
| | - Astrid Bergeat
- Institut des Sciences Moléculaires, CNRS UMR 5255, Université Bordeaux I, 351 Cours de la Libération, 33405 Talence cedex, France
| | - Françoise Caralp
- Institut des Sciences Moléculaires, CNRS UMR 5255, Université Bordeaux I, 351 Cours de la Libération, 33405 Talence cedex, France
| | - Raphaël Mereau
- Institut des Sciences Moléculaires, CNRS UMR 5255, Université Bordeaux I, 351 Cours de la Libération, 33405 Talence cedex, France
| | - Kevin M. Hickson
- Institut des Sciences Moléculaires, CNRS UMR 5255, Université Bordeaux I, 351 Cours de la Libération, 33405 Talence cedex, France
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D'Andrea TM, Zhang X, Jochnowitz EB, Lindeman TG, Simpson CJSM, David DE, Curtiss TJ, Morris JR, Ellison GB. Oxidation of Organic Films by Beams of Hydroxyl Radicals. J Phys Chem B 2007; 112:535-44. [DOI: 10.1021/jp7096108] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Affiliation(s)
- Timothy M. D'Andrea
- Department of Chemistry & Biochemistry, University of Colorado, Boulder, Colorado 80309-0215, Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, California 91109-8099, Institute for Physical Chemistry, University of Basel, Klingelbergstrasse 19, CH-4056 Basel, Switzerland, Department of Chemistry, Colorado College, Colorado Springs, Colorado 80903-3298, Physical Chemistry Laboratory, Oxford University, South Parks Road, Oxford, OX1 3QZ, United Kingdom,
| | - Xu Zhang
- Department of Chemistry & Biochemistry, University of Colorado, Boulder, Colorado 80309-0215, Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, California 91109-8099, Institute for Physical Chemistry, University of Basel, Klingelbergstrasse 19, CH-4056 Basel, Switzerland, Department of Chemistry, Colorado College, Colorado Springs, Colorado 80903-3298, Physical Chemistry Laboratory, Oxford University, South Parks Road, Oxford, OX1 3QZ, United Kingdom,
| | - Evan B. Jochnowitz
- Department of Chemistry & Biochemistry, University of Colorado, Boulder, Colorado 80309-0215, Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, California 91109-8099, Institute for Physical Chemistry, University of Basel, Klingelbergstrasse 19, CH-4056 Basel, Switzerland, Department of Chemistry, Colorado College, Colorado Springs, Colorado 80903-3298, Physical Chemistry Laboratory, Oxford University, South Parks Road, Oxford, OX1 3QZ, United Kingdom,
| | - T. G. Lindeman
- Department of Chemistry & Biochemistry, University of Colorado, Boulder, Colorado 80309-0215, Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, California 91109-8099, Institute for Physical Chemistry, University of Basel, Klingelbergstrasse 19, CH-4056 Basel, Switzerland, Department of Chemistry, Colorado College, Colorado Springs, Colorado 80903-3298, Physical Chemistry Laboratory, Oxford University, South Parks Road, Oxford, OX1 3QZ, United Kingdom,
| | - C. J. S. M. Simpson
- Department of Chemistry & Biochemistry, University of Colorado, Boulder, Colorado 80309-0215, Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, California 91109-8099, Institute for Physical Chemistry, University of Basel, Klingelbergstrasse 19, CH-4056 Basel, Switzerland, Department of Chemistry, Colorado College, Colorado Springs, Colorado 80903-3298, Physical Chemistry Laboratory, Oxford University, South Parks Road, Oxford, OX1 3QZ, United Kingdom,
| | - Donald E. David
- Department of Chemistry & Biochemistry, University of Colorado, Boulder, Colorado 80309-0215, Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, California 91109-8099, Institute for Physical Chemistry, University of Basel, Klingelbergstrasse 19, CH-4056 Basel, Switzerland, Department of Chemistry, Colorado College, Colorado Springs, Colorado 80903-3298, Physical Chemistry Laboratory, Oxford University, South Parks Road, Oxford, OX1 3QZ, United Kingdom,
| | - Thomas J. Curtiss
- Department of Chemistry & Biochemistry, University of Colorado, Boulder, Colorado 80309-0215, Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, California 91109-8099, Institute for Physical Chemistry, University of Basel, Klingelbergstrasse 19, CH-4056 Basel, Switzerland, Department of Chemistry, Colorado College, Colorado Springs, Colorado 80903-3298, Physical Chemistry Laboratory, Oxford University, South Parks Road, Oxford, OX1 3QZ, United Kingdom,
| | - John R. Morris
- Department of Chemistry & Biochemistry, University of Colorado, Boulder, Colorado 80309-0215, Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, California 91109-8099, Institute for Physical Chemistry, University of Basel, Klingelbergstrasse 19, CH-4056 Basel, Switzerland, Department of Chemistry, Colorado College, Colorado Springs, Colorado 80903-3298, Physical Chemistry Laboratory, Oxford University, South Parks Road, Oxford, OX1 3QZ, United Kingdom,
| | - G. Barney Ellison
- Department of Chemistry & Biochemistry, University of Colorado, Boulder, Colorado 80309-0215, Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, California 91109-8099, Institute for Physical Chemistry, University of Basel, Klingelbergstrasse 19, CH-4056 Basel, Switzerland, Department of Chemistry, Colorado College, Colorado Springs, Colorado 80903-3298, Physical Chemistry Laboratory, Oxford University, South Parks Road, Oxford, OX1 3QZ, United Kingdom,
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