Laboratory studies of bimolecular reactions of positive ions in interstellar clouds, in comets, and in planetary atmospheres of reducing composition. [Distributions, rate constants]
Laboratory results are presented for over 200 bimolecular ion-molecule reactions of importance in the chemistry of interstellar clouds, comets, and planetary atmospheres with reducing compositions. The product distributions and rate constants measured for these reactions at 300 K using ion cyclotron resonance methods are given in 23 tables covering the reactions of H/sup +/, He/sup +/, Ne/sup +/, Ar/sup +/, C/sup +/, N/sup +/, S/sup +/, H/sub 2//sup +/, CH/sup +/, OH/sup +/, NH/sup +/, HS/sup +/, H/sub 3//sup +/, H/sub 2/O/sup +/, NH/sub 2//sup +/, H/sub 2/S/sup +/, NH/sub 3//sup +/, CH/sub 2//sup +/, CH/sub 3//sup +/, CH/sub 4//sup +/, C/sub 2/H/sub 2//sup +/, C/sub 2/H/sub 3//sup +/, C/sub 2/H/sub 4//sup +/, C/sub 2/H/sub 5//sup +/, C/sub 2/H/sub 6//sup +/, and several other ions with many stable neutral molecules including H/sub 2/, O/sub 2/, N/sub 2/, CO, NO, CO/sub 2/, N/sub 2/O, HCN, H/sub 2/O, NH/sub 3/, H/sub 2/S, H/sub 2/CO, CH/sub 4/, C/sub 2/H/sub 2/, C/sub 2/H/sub 4/, and C/sub 2/H/sub 6/. A special compilation is given for the reactions of the above ions with H/sub 2/, which also includes the reactions of O/sup +/, HeH/sup +/, CO/sup +/, NO/sup +/, CN/sup +/, HCN/sup +/, HCO/sup +/, H/sub 2/CO/sup +/, C/sub 2//sup +/, N/sub 2//sup +/, O/sub 2//sup +/, C/sub 2/H/sup +/, O/sub 2/H/sup +/, and C/sub 2/H/sub 2//sup +/ ions with H/sub 2/ as well as the exchange reactions of several ions with isotopic hydrogen molecules. In addition to the experimental data, some prescriptions are given for predicting the most probable product channels for reactions for which there are no experimental data yet available. These prescriptions are based on the compilation of observed preferred product channels for reactions involving a particular ions. These laboratory data and prescriptions are used in a few cases to illustrate applications to recent work modeling the chemistry of interstellar clouds, comets, and the atmospheres of the Jovian planets and their satellites. The areas of astrophysical chemistry in which further laboratory work is required are also briefly examined.
- Research Organization:
- Jet Propulsion Laboratory
- OSTI ID:
- 7259573
- Journal Information:
- Astrophys. J., Suppl. Ser.; (United States), Vol. 33:4
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
GENERAL PHYSICS
COMETS
CHEMICAL REACTION KINETICS
COSMIC GASES
INTERSTELLAR SPACE
PLANETARY ATMOSPHERES
CHARGE EXCHANGE
CHEMICAL COMPOSITION
COSMIC DUST
ION CYCLOTRON RESONANCE SPECTROSCOPY
ION-MOLECULE COLLISIONS
PROTONS
RARE GASES
REDUCTION
ATMOSPHERES
BARYONS
CHEMICAL REACTIONS
COLLISIONS
DUSTS
ELEMENTARY PARTICLES
ELEMENTS
FERMIONS
FLUIDS
GASES
HADRONS
ION COLLISIONS
ION SPECTROSCOPY
KINETICS
MOLECULE COLLISIONS
NONMETALS
NUCLEONS
REACTION KINETICS
SPACE
SPECTROSCOPY
640105* - Astrophysics & Cosmology- Galaxies
640107 - Astrophysics & Cosmology- Planetary Phenomena