Zymak, I and Žabka, J and Polášek, M and Španěl, P and Smith, D (2016) A Pilot Study of Ion - Molecule Reactions at Temperatures Relevant to the Atmosphere of Titan. Origins of Life and Evolution of Biospheres. ISSN 1573-0875

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Abstract

Reliable theoretical models of the chemical kinetics of the ionosphere of Saturn's moon, Titan, is highly dependent on the precision of the rates of the reactions of ambient ions with hydrocarbon molecules at relevant temperatures. A Variable Temperature Selected Ions Flow Tube technique, which has been developed primarily to study these reactions at temperatures within the range of 200-330 K, is briefly described. The flow tube temperature regulation system and the thermalisation of ions are also discussed. Preliminary studies of two reactions have been carried out to check the reliability and efficacy of kinetics measurements: (i) Rate constants of the reaction of CH3 (+) ions with molecular oxygen were measured at different temperatures, which indicate values in agreement with previous ion cyclotron resonance measurements ostensibly made at 300 K. (ii) Formation of CH3 (+) ions in the reaction of N2 (+) ions with CH4 molecules were studied at temperatures within the range 240-310 K which showed a small but statistically significant decrease of the ratio of product CH3 (+) ions to reactant N2 (+) ions with reaction temperature.

Item Type: Article
Additional Information: Paper presented at the conference: Habitability in the Universe: From the Early Earth to Exoplanets 22–27 March 2015, Porto, Portugal The final publication is available at Springer via http://dx.doi.org/[insert DOI]”."
Uncontrolled Keywords: Titan ionosphere, Variable Temperature Selected Ions Flow Tube, VT-SIFT, CH3 + ions, Ion-molecule reactions
Subjects: Q Science > QH Natural history > QH301 Biology
Q Science > QR Microbiology
Divisions: Faculty of Medicine and Health Sciences > Institute for Science and Technology in Medicine
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Depositing User: Symplectic
Date Deposited: 07 Jun 2016 13:36
Last Modified: 30 Jun 2017 15:33
URI: http://eprints.keele.ac.uk/id/eprint/1817

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