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Electron detachment in negative ion molecule collisions

Thesis/Dissertation ·
OSTI ID:5692350
Absolute total cross sections for electron detachment, reactive scattering, charge transfer, and dissociative charge transfer were measured for collisions of hydrogen and halogen negative ions with various molecular targets. The reactants investigated involve H/sup -/, D/sup -/, F/sup -/, Cl/sup -/, Br/sup -/, and I/sup -/ ions as projectiles and H/sub 2/, D/sub 2/, HD, N/sub 2/, CO, O/sub 2/, CO/sub 2/, CH/sub 4/, and Cl/sub 2/ molecules as targets. The energy range of these experiments extended from about 1 eV to about 300 eV in the lab. The threshold behavior of the detachment cross sections for the reactants H/sup -/(D/sup -/) + H/sub 2/, D/sub 2/ and HD were determiend. The thresholds for detachment for both H/sup -/ and D/sup -/ ions are found to be larger than the electron affinity of hydrogen, and isotopic substitution reveals that the detachment cross sections scale with relative collision energy at low collision energies and with relative collision velocity at high collision energies. Upper and lower bounds on detachment-rate constants based upon the measurements are presented. Studies of the reactants H/sup -/(D/sup -/) and B/sub 2/, CO, O/sub 2/, CO/sub 2/, and CH/sub 4/ reveal that electron detachment is the dominant process for all the molecular targets except O/sub 2/ for which charge transfer dominates. Isotope effects are observed in all the cross sections. In the case of the collisions of F/sup -/ and Cl/sup -/ with H/sub 2/, D/sub 2/ and HD, reactive scattering is found to be the dominant inelastic channel for F/sup -/ projectile. Charge transfer and dissociative charge transfer cross sections are found to be the dominant channels for collisions of Cl/sup -/, Br/sup -/ and I/sup -/ with Cl/sub 2/.
Research Organization:
College of William and Mary, Williamsburg, VA (USA)
OSTI ID:
5692350
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
ALKANES
ANIONS
BROMINE IONS
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON MONOXIDE
CARBON OXIDES
CHALCOGENIDES
CHARGE EXCHANGE
CHARGED PARTICLES
CHLORINE
CHLORINE IONS
COLLISIONS
DEUTERIDES
DEUTERIUM
DEUTERIUM COMPOUNDS
DEUTERIUM IONS
ELECTRON DETACHMENT
ELEMENTS
ENERGY RANGE
EV RANGE
FLUORINE IONS
HALOGENS
HYDROCARBONS
HYDROGEN
HYDROGEN COMPOUNDS
HYDROGEN DEUTERIDE
HYDROGEN IONS
HYDROGEN IONS 1 MINUS
HYDROGEN ISOTOPES
IODINE IONS
ION COLLISIONS
ION-MOLECULE COLLISIONS
IONS
ISOTOPE EFFECTS
ISOTOPES
LIGHT NUCLEI
METHANE
MOLECULE COLLISIONS
NITROGEN
NONMETALS
NUCLEI
ODD-ODD NUCLEI
ORGANIC COMPOUNDS
OXIDES
OXYGEN
OXYGEN COMPOUNDS
STABLE ISOTOPES