CRITICAL REVIEW OF N, N{sup +}, N{sup +} {sub 2}, N{sup ++}, And N{sup ++} {sub 2} MAIN PRODUCTION PROCESSES AND REACTIONS OF RELEVANCE TO TITAN'S ATMOSPHERE
- Institut de Planetologie et d'Astrophysique de Grenoble, UJF-Grenoble 1/CNRS-INSU, UMR 5274, F-38041 Grenoble (France)
- Laboratoire Atmospheres, Milieux, Observations Spatiales, CNRS, UVSQ/UPMC, F-78280 Guyancourt (France)
- Laboratoire de Chimie Physique, CNRS/UPS UMR 8000, Bat.349, F-91405 Orsay Cedex (France)
- Dipartimento di Chimica, Universita degli Studi di Perugia, Via Elce di Sotto, 8, I-06123 Perugia (Italy)
- Departement de Physique Moleculaire, Universite de Rennes 1, Institut de Physique de Rennes, UMR 6251 CNRS Universite, Campus de Beaulieu-Bat 11C, F-35042 Rennes Cedex (France)
- Institut des Sciences Moleculaires, Universite Bordeaux 1/CNRS, UMR 5255, 351 cours de la Liberation, F-33405 Talence Cedex (France)
- J. Heyrovsky Institute of Physical Chemistry, Academy of Sciences of the Czech Republic, Dolejskova 3 CZ-182 23 Prague 8 (Czech Republic)
- Dipartimento di Fisica, Universita di Trento, Via Sommarive 14, I-38123 Trento (Italy)
- Biostatistics and Data Management, IASMA Research and Innovation Centre, Fondazione E. Mach, Via E. Mach, 1 I-38010 S. Michele all'Adige (Italy)
- Department of Chemistry, UCL, Christopher Ingold Laboratories, 20 Gordon Street, London WC1H 0AJ (United Kingdom)
- Groupe de Spectrometrie Moleculaire et Atmospherique, CNRS, UMR 6089, Campus Moulin de la Housse-BP 1039, Universite Reims Champagne-Ardenne, F-51687 Reims (France)
This paper is a detailed critical review of the production processes and reactions of N, N{sup +}, N{sup +} {sub 2}, N{sup ++}, and N{sup ++} {sub 2} of relevance to Titan's atmosphere. The review includes neutral, ion-molecule, and recombination reactions. The review covers all possible active nitrogen species under Titan's atmospheric conditions, specifically N{sub 2} (A {sup 3}{Sigma}{sup +} {sub u}), N ({sup 4} S), N ({sup 2} D), N ({sup 2} P), N{sup +} {sub 2}, N{sup +} ({sup 3} P), N{sup +} ({sup 1} D), N{sup ++} {sub 2}, and N{sup ++} species, and includes a critical survey of the reactions of N, N{sup +}, N{sup +} {sub 2}, N{sup ++}, and N{sup ++} {sub 2} with N{sub 2}, H{sub 2}, D{sub 2}, CH{sub 4}, C{sub 2}H{sub 2}, C{sub 2}H{sub 4}, C{sub 2}H{sub 6}, C{sub 3}H{sub 8} and the deuterated hydrocarbon analogs, as well as the recombination reactions of N{sup +} {sub 2}, N{sup +}, N{sup ++} {sub 2}, and N{sup ++}. Production processes, lifetimes, and quenching by collisions with N{sub 2} of all reactant species are reviewed. The N ({sup 4} S) state is reactive with radicals and its reactions with CH{sub 2}, CH{sub 3}, C{sub 2}H{sub 3}, and C{sub 2}H{sub 5} are reviewed. Metastable states N{sub 2} (A {sup 3}{Sigma}{sup +} {sub u}), N ({sup 2} D), and N ({sup 2} P) are either reactive or quenched by collisions with the target molecules reviewed. The reactions of N{sup +} ({sup 1} D) have similar rate constants as N{sup +} ({sup 3} P), but the product branching ratios differ significantly. Temperature effects and the role of the kinetic energy content of reactants are investigated. In all cases, experimental uncertainties of laboratory data are reported or estimated. Recommended values with uncertainties, or estimated values when no data are available, are given for rate constants and product branching ratios at 300 K and at the atmospheric temperature range of Titan (150-200 K for neutral reactions and 150 K for ion reactions).
- OSTI ID:
- 22107742
- Journal Information:
- Astrophysical Journal, Supplement Series, Vol. 204, Issue 2; Other Information: Country of input: International Atomic Energy Agency (IAEA); ISSN 0067-0049
- Country of Publication:
- United States
- Language:
- English
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