Dynamics of the O(+) + H2O charge-transfer reaction and its implications for space-borne measurements

Details Dynamics of the O(+) + H2O charge-transfer reaction and its implications for space-borne measurements Dynamics of the O(+) + H2O charge-transfer reaction and its implications for space-borne measurements

Dec 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992p%26ss...40.1695d&link_type=abstract

Planetary and Space Science (ISSN 0032-0633), vol. 40, no. 12, p. 1695-1704.

Computer Science

12

Charge Transfer, Oxygen Atoms, Oxygen Ions, Spaceborne Experiments, Time Of Flight Spectrometers, Water Vapor, Center Of Mass, Ion Beams, Ion Temperature, Kinetic Energy, Positive Ions

Scientific paper

O(+)(S-4) + H2O charge-transfer cross-section and product-ion time-of-flight measurements are presented over a center-of-mass collision energy range of 0.2-15.0 eV. The results are obtained with a newly constructed guided-ion beam experiment. The measured energy dependence of the charge-transfer cross-section agrees well with previous measurements and ADO model predictions of Bates (1981, 1982, 1984) at low collision energies, but exhibits significant differences at collision energies above 2 eV. The product kinetic energy analysis shows that most of the product ions are produced with near-thermal kinetic energies. At low collision energies, a significant backscattered channel is observed that is associated with complex formation. This channel exhibits a cross-section of approximately 1.4 A-squared at a collision energy of 2.65 eV, corresponding to a laboratory ion energy of 5 eV.

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