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Title: Kinetics of ion-ion mutual neutralization: Halide anions with polyatomic cations

The binary mutual neutralization (MN) of a series of 17 cations (O{sub 2}{sup +}, NO{sup +}, NO{sub 2}{sup +}, CO{sup +}, CO{sub 2}{sup +}, Cl{sup +}, Cl{sub 2}{sup +}, SO{sub 2}{sup +}, CF{sub 3}{sup +}, C{sub 2}F{sub 5}{sup +}, NH{sub 3}{sup +}, H{sub 3}{sup +}, D{sub 3}{sup +}, H{sub 2}O{sup +}, H{sub 3}O{sup +}, ArH{sup +}, ArD{sup +}) with 3 halide anions (Cl{sup −}, Br{sup −}, I{sup −}) has been investigated in a flowing afterglow-Langmuir probe apparatus using the variable electron and neutral density attachment mass spectrometry technique. The MN rate constants of atom-atom reactions are dominated by the chemical nature of the system (i.e., the specific locations of curve crossings). As the number of atoms in the system increases, the MN rate constants become dominated instead by the physical nature of the system (e.g., the relative velocity of the reactants). For systems involving 4 or more atoms, the 300 K MN rate constants are well described by 2.7 × 10{sup −7} μ{sup −0.5}, where the reduced mass is in Da and the resulting rate constants in cm{sup 3} s{sup −1}. An upper limit to the MN rate constants appears well described by the complex potential model described by Hickmanmore » assuming a cross-section to neutralization of 11 000 Å{sup 2} at 300 K, equivalent to 3.5 × 10{sup −7} μ{sup −0.5}.« less
Authors:
; ; ;  [1]
  1. Space Vehicles Directorate, Air Force Research Laboratory, Kirtland Air Force Base, Albuquerque, New Mexico 87117 (United States)
Publication Date:
OSTI Identifier:
22420109
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Chemical Physics; Journal Volume: 140; Journal Issue: 22; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; AMMONIA; ANIONS; ATOMS; CARBON DIOXIDE; CARBON MONOXIDE; CHLORINE; CHLORINE IONS; CROSS SECTIONS; ELECTRONS; HALIDES; HYDROGEN IONS 3 PLUS; LANGMUIR PROBE; MASS SPECTROSCOPY; NITRIC OXIDE; OXONIUM IONS; REACTION KINETICS; SULFUR DIOXIDE