Vibrational state resolved measurements of differential cross sections for H/sup +/+O/sub 2/ charge transfer collisions
Vibrational state-to-state charge transfer cross sections have been obtained for H/sup +/+O/sub 2/ collisions at E-italic/sub cm/ = 23.0 eV in a differential scattering experiment by measuring the product H atom energy distribution in the range 0/sup 0/< or =theta< or =11/sup 0/. The results show a strong dependence of the distribution of vibrational transition probabilities P-italic(O/sub 2/, v-italic = 0..-->..O/sup +//sub 2/, v-italic'') on the scattering angle. At very low angles (thetaapprox. <2/sup 0/) we find a strongly enhanced contribution of the more resonant states v-italic'' = 3--6 compared to a Franck--Condon distribution, which is peaked at v-italic'' = 1 and, on the other hand, at moderate angles of about theta = 4/sup 0/ comes very close to the measured spectra. At even larger angles increasing deviations from the Franck--Condon distribution towards larger excitation of higher vibrational states are observed. An explanation of these and the related results for the nonexchange collisions leading to neutral O/sub 2/ vibrational excitation is given in terms of the underlying potential energy surfaces.
- Research Organization:
- Max-Planck-Institut fuer Stroemungsforschung, Bunsenstrasse 10, 3400 Goettingen, Federal Republic of Germany
- OSTI ID:
- 5110029
- Journal Information:
- J. Chem. Phys.; (United States), Journal Name: J. Chem. Phys.; (United States) Vol. 85:6; ISSN JCPSA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
Molecular & Chemical Physics-- Collision Phenomena
74 ATOMIC AND MOLECULAR PHYSICS
CATIONS
CHARGE EXCHANGE
CHARGED PARTICLES
COLLISIONS
CROSS SECTIONS
DIFFERENTIAL CROSS SECTIONS
ELEMENTS
ENERGY LEVELS
ENERGY SPECTRA
ENERGY-LEVEL TRANSITIONS
EXCITED STATES
FRANCK-CONDON PRINCIPLE
HYDROGEN IONS
HYDROGEN IONS 1 PLUS
ION COLLISIONS
ION-MOLECULE COLLISIONS
IONS
MOLECULE COLLISIONS
NONMETALS
OXYGEN
SPECTRA
VIBRATIONAL STATES