Abstract
The formation and recombination of a protonated acetone dimer withelectrons was studied in the flowing afterglow. H3O+ ionswere formed in the early post-discharge region. The subsequent additionof acetone leads to the formation of the protonated ions CH3COCH3H+. These ions further associate with acetone formingthe cluster ions H+·(CH3COCH3)2 that react furtherwith acetone, but very slowly. This facilitates the creation of anafterglow plasma with a dominant population of H+·(CH3COCH3)2. The evolution of electron number density (ne) and electron temperature (Te) is measured using theLangmuir probe. The recombination rate coefficients that are obtainedindicate a negative temperature dependence: α = (3.4±1)×10-6 cm3 s-1 at Te = (580±150) K andα = (7±2.5)×10-6 cm3 s-1 atTe = (450±100) K.
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