Ionic Reactions of Atmospheric Importance.
Interim scientific rept. no. 1, 1 Feb 82-30 Sep 83,
BIRMINGHAM UNIV (ENGLAND) DEPT OF SPACE RESEARCH
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A variable-temperature flowing afterglowLangmuir probe FALP apparatus has been used to study the temperature dependence of a number of electron-ion dissociative recombination coefficients, alpha e, and electron attachment coefficients, Beta, over the temperature range 200-600 K. Thus alpha e02, alpha eNO and alpha eNH4 have been shown to vary inversely with temperature, T, as alpha e approximately T to the -n power with n 0.7, 0.9 and 0.6 respectively. Alpha eH30 was found to be independent of temperature. BetaCC14, BetaCC13F and Beta SF6 were all very large, close to their theoretical maximum values approximately .0000004 ccs at 300 K and varied only very slowly with temperature over the available range, whereas BetaCC12F2, BetaCHC13 and BetaC12 were smaller and increased appreciably with temperature. From the data, activation energies, Ea, were obtained for the dissociative attachment reactions of CC13F, CC12F2, CHC13 and C12. Thus EaCC13F approximately 0.02eV, EaCC12F2 approximtely 0.15eV, EaCHC13 approximately 0.12 eV and EaC12 approximately 0.05 eV.
- Atmospheric Physics
- Plasma Physics and Magnetohydrodynamics