학술논문
Reaction of size-selected iron-oxide cluster cations with methane: a model study of rapid methane loss in Mars' atmosphere.
Document Type
Academic Journal
Author
Arakawa M; Department of Chemistry, Faculty of Science, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan. arakawa@chem.kyushu-univ.jp.; Kono S; Department of Chemistry, Faculty of Science, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan. arakawa@chem.kyushu-univ.jp.; Sekine Y; Earth-Life Science Institute (ELSI), Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8550, Japan. sekine@elsi.jp.; Terasaki A; Department of Chemistry, Faculty of Science, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan. arakawa@chem.kyushu-univ.jp.
Source
Publisher: Royal Society of Chemistry Country of Publication: England NLM ID: 100888160 Publication Model: Electronic Cited Medium: Internet ISSN: 1463-9084 (Electronic) Linking ISSN: 14639076 NLM ISO Abbreviation: Phys Chem Chem Phys Subsets: PubMed not MEDLINE; MEDLINE
Subject
Language
English
Abstract
We report gas-phase reactions of free iron-oxide clusters, Fe n O m + , and their Ar adducts with methane in the context of chemical processes in Mars' atmosphere. Methane activation was observed to produce Fe n O m CH 2 + /Fe n O m CD 2 + and Fe n O m C + , where the reactivity exhibited size and composition dependence. For example, the rate coefficients of methane activation for Fe 3 O + and Fe 4 O + were estimated to be 1 × 10 -13 and 3 × 10 -13 cm 3 s -1 , respectively. Based on these reaction rate coefficients, the presence of iron-oxide clusters/particles with a density as low as 10 7 cm -3 in Mars' atmosphere would explain the rapid loss of methane observed recently by the Curiosity rover.