Crossed molecular beam studies of some ion molecule reactions of C/sup +/ and CH/sub 3//sup +/
Thesis/Dissertation
·
OSTI ID:7019621
The astrophysically important ion-molecule condensation reactions of C/sup +/ and CH/sub 3//sup +/ with C/sub 2/H/sub 2/ and C/sub 2/H/sub 4/ as well as those of C/sup +/ with H/sub 2/O, O/sub 2/, and HCl were investigated by the crossed molecular beam method over the energy range 0.5-2.0 eV. Reactant ion beams were generated by dissociative charge transfer or by electron impact while neutral beams were generated by a supersonic nozzle expansion of the neat gases or of seeded mixtures with H/sub 2/. Energy and angular distributions of the products were obtained and transformed to center of mass (CM) relative doubly differential cross sections. The condensation reactions with C/sub 2/H/sub 2/ and C/sub 2/H/sub 4/ were found to proceed via an osculating mechanism as indicated by the symmetry of the CM angular distributions at the low end of the energy range and by their shift to the forward direction at higher energies. The reactions of C/sup +/ with H/sub 2/O and O/sub 2/ were found to proceed through long-lived collision complexes with lifetimes on the order of 1 psec. All the condensation reactions yielded highly internally excited products having nonstatistical relative recoil energy distributions as compared to theoretically calculated statistical distributions. The decarbonylation of acetaldehyde by Fe/sup +/ at 0.5 eV and by Cr/sup +/ at 1.0 eV relative energies was also studied by the crossed beam method.
- Research Organization:
- Rochester Univ., NY (USA)
- OSTI ID:
- 7019621
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
640304* -- Atomic
Molecular & Chemical Physics-- Collision Phenomena
74 ATOMIC AND MOLECULAR PHYSICS
ACETALDEHYDE
ACETYLENE
ALDEHYDES
ALKENES
ALKYL RADICALS
ALKYNES
ANGULAR DISTRIBUTION
BEAMS
CARBON IONS
CATIONS
CHARGE EXCHANGE
CHARGED PARTICLES
CHROMIUM IONS
COLLIDING BEAMS
COLLISIONS
DISTRIBUTION
ELEMENTS
ENERGY RANGE
ENERGY SPECTRA
ETHYLENE
EV RANGE
FLUIDS
GASES
HYDROCARBONS
HYDROCHLORIC ACID
HYDROGEN COMPOUNDS
INORGANIC ACIDS
ION COLLISIONS
IONS
IRON IONS
METHYL RADICALS
MILLI EV RANGE
MOLECULE COLLISIONS
NONMETALS
ORGANIC COMPOUNDS
OXYGEN
RADICALS
SPECTRA
VAPORS
WATER VAPOR
Molecular & Chemical Physics-- Collision Phenomena
74 ATOMIC AND MOLECULAR PHYSICS
ACETALDEHYDE
ACETYLENE
ALDEHYDES
ALKENES
ALKYL RADICALS
ALKYNES
ANGULAR DISTRIBUTION
BEAMS
CARBON IONS
CATIONS
CHARGE EXCHANGE
CHARGED PARTICLES
CHROMIUM IONS
COLLIDING BEAMS
COLLISIONS
DISTRIBUTION
ELEMENTS
ENERGY RANGE
ENERGY SPECTRA
ETHYLENE
EV RANGE
FLUIDS
GASES
HYDROCARBONS
HYDROCHLORIC ACID
HYDROGEN COMPOUNDS
INORGANIC ACIDS
ION COLLISIONS
IONS
IRON IONS
METHYL RADICALS
MILLI EV RANGE
MOLECULE COLLISIONS
NONMETALS
ORGANIC COMPOUNDS
OXYGEN
RADICALS
SPECTRA
VAPORS
WATER VAPOR