Flowing Afterglow Studies of Temperature Dependencies for Electron Dissociative Recombination of HCNH+, CH3CNH+ and CH3CH2CNH+ and Their Symmetrical Proton Bound Dimers

Details Flowing Afterglow Studies of Temperature Dependencies for Electron Dissociative Recombination of HCNH+, CH3CNH+ and CH3CH2CNH+ and Their Symmetrical Proton Bound Dimers Flowing Afterglow Studies of Temperature Dependencies for Electron Dissociative Recombination of HCNH+, CH3CNH+ and CH3CH2CNH+ and Their Symmetrical Proton Bound Dimers

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufm.p11b1226m&link_type=abstract

American Geophysical Union, Fall Meeting 2009, abstract #P11B-1226

Physics

[0317] Atmospheric Composition And Structure / Chemical Kinetic And Photochemical Properties, [0335] Atmospheric Composition And Structure / Ion Chemistry Of The Atmosphere, [0343] Atmospheric Composition And Structure / Planetary Atmospheres

Scientific paper

A study has been made using a variable temperature flowing afterglow Langmuir probe technique (VT-FALP) to determine the equilibrium temperature dependencies of the dissociative electron-ion recombination of the protonated cyanide ions (RCNH+, where R = H, CH3 and C2H5) and their symmetrical proton bound dimers (RCNH+NCR). The power law temperature dependencies of the recombination coefficients, αe, over the temperature range 180 to 600 K for the protonated ions are αe(T)(cm3s-1) = 3.5±0.5×10-7 (300/T)1.38 for HCNH+, αe(T)= 3.4±0.5×10-7 (300/T)1.03 for CH3CNH+, and αe(T)= 4.6×10-7(300/T)0.81 for CH3CH2CNH+. The equivalent values for the proton bound dimers are αe(T)(cm3s-1) = 2.4±0.4×10-6(300/T)0.5 for (HCN)2H+, αe(T)= 2.8±0.4×10-6(300/T)0.5 for (CH3CN)2H+, and αe(T)= 2.3±0.3×10-6(300/T)0.5 for (CH3CH2CN)2H+. The relevance of these data to molecular synthesis in the Titan ionosphere are discussed.

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