THE DISSOCIATIVE RECOMBINATION OF $CH_{3}O^{+}$ AND $CD_{3}O^{+}$ CATIONS
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Date
2006
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Ohio State University
Abstract
Reactions with the methoxy radical CH$_{3}$O$^{+}$ have found to be significant pathways of production and destruction of important interstellar molecules and ions like NH$_{4}^{+}$, NH$_{3}$, H$_{2}$O, H$_{3}$O$^{+}$ }. These processes compete with the dissociative recombination of the named ions. Therefore, measurements of the rates, cross-sections and branching ratios of the dissociative recombination of the iosotopomers $CH_{3}O^{+}$ and $CD_{3}O^{+}$ have been perfomed at the CRYRING storage ring located at Stockholm, Sweden. Preliminary evaluation of the data yielded a reaction rate coefficient of $% \ 6.8\ast 10^{-7}\left( \frac{T}{300}\right) ^{-0.63}$ cm$^{3}$mol$^{-1}$s$% ^{-1}$ and $\ 8.4\ast 10^{-7}\left( \frac{T}{300}\right) ^{-0.62}\ $ cm$^{3}$% mol$^{-1}$s$^{-1}$ for $CH_{3}O^{+}$ and $CD_{3}O^{+},$ respectively. Calculation of the branching ratios rendered the following branching ratios for the reaction channels leading to the fissure of the C-O bond:, $% H_{2}O+CH\ \ (0.7\%),$ $CH_{2}+OH$ \ $(1.6\%);$\ $D_{2}O+CD\ \ (2\%),$ $% CD_{2}+OD$ \ $(6\%)$ respectively. The rest of the dissociative recombination rates was contributed from channels leaving the C-O bond intact: 92\% and 98\% for $CH_{3}O^{+}$ and $CD_{3}O^{+}$, respectively. Contrary to the $CH_{3}OH_{2}^{+}$ ion}, the pathways preserving the bond between the heavy atoms dominate.
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Author Institution: Roslagstullsbacken 5:310 ZIP 114 21 Stockholm Sweden