Vibrationally resolved inelastic scattering and charge transfer in H sup + +C sub 2 H sub 2 collisions
- Max-Planck-Institut f uer Stroemungsforschung, Bunsenstrasse 10, D-3400 Goettingen (Germany)
- Center for Molecular Dynamics and Energy Transfer, Department of Chemistry, The Catholic University of America, Washington, D.C. (USA)
Differential total cross sections and time-of-flight spectra for inelastic scattering and charge transfer of protons with acetylene have been measured in a crossed molecular beam apparatus at 30 eV collision energy. Both vibrational excitation of the C--C stretch and C--H stretch vibrations are resolved in the time-of-flight spectra. The angular distributions indicate the existence of a potential well in the entrance channel of 1.2 eV. The angle dependence of the time-of-flight spectra reveal that the stiff C--H stretch vibrations are preferentially excited in grazing collisions by long range electrostatic multipole interactions, whereas the C--C stretch vibrations although softer are only excited by a short range interaction. The vibrational normal modes observed to be excited can be explained in terms of a proposed potential hypersurface and the associated nonadiabatic couplings and vibronic symmetry correlations.
- OSTI ID:
- 5008377
- Journal Information:
- Journal of Chemical Physics; (United States), Journal Name: Journal of Chemical Physics; (United States) Vol. 95:11; ISSN JCPSA; ISSN 0021-9606
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
Molecular & Chemical Physics-- Collision Phenomena
74 ATOMIC AND MOLECULAR PHYSICS
ACETYLENE
ALKYNES
ANGULAR DISTRIBUTION
CATIONS
CHARGE EXCHANGE
CHARGED PARTICLES
COLLISIONS
CROSS SECTIONS
DIFFERENTIAL CROSS SECTIONS
DISTRIBUTION
ENERGY LEVELS
ENERGY RANGE
EV RANGE
EV RANGE 10-100
EXCITED STATES
HYDROCARBONS
HYDROGEN IONS
HYDROGEN IONS 1 PLUS
INELASTIC SCATTERING
ION COLLISIONS
ION-MOLECULE COLLISIONS
IONS
MOLECULE COLLISIONS
ORGANIC COMPOUNDS
SCATTERING
TIME-OF-FLIGHT METHOD
VIBRATIONAL STATES