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Reactive scattering and electron detachment in collisions of halogen negative ions with isotopic hydrogen molecules

Journal Article · · J. Chem. Phys.; (United States)
DOI:https://doi.org/10.1063/1.442841· OSTI ID:5651532
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Total cross sections for reactive scattering and collisional electron detachment have been measured for collisions of F/sup -/ and Cl/sup -/ with H/sub 2/, D/sub 2/, and HD. The collision energy extends from below the energetic thresholds for the processes studied up to a laboratory energy of about 300 eV. Reactive scattering is found to be the dominant inelastic channel for the case of the F/sup -/ projectile. Isotope effects are observed in all cross sections. Electron detachment of F/sup -/ is found to occur by two distinct mechanisms. A striking difference in the reactive and detachment cross sections is observed when Cl/sup -/ is substituted for F/sup -/ in that the electron detachment cross section is generally larger than that for reactive scattering. As in the F/sup -/ case, isotope effects are also present for the Cl/sup -/ projectile. The isotope effects observed for electron detachment of Cl/sup -/ suggest that detachment cannot be described by any unique mechanism.
Research Organization:
Department of Physics, College of William and Mary, Williamsburg, Virginia 23185
OSTI ID:
5651532
Journal Information:
J. Chem. Phys.; (United States), Journal Name: J. Chem. Phys.; (United States) Vol. 76:10; ISSN JCPSA
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
ANIONS
CHARGED PARTICLES
CHLORINE IONS
COLLISIONS
CROSS SECTIONS
DATA
DEUTERIDES
DEUTERIUM
DEUTERIUM COMPOUNDS
ELECTRON DETACHMENT
ELEMENTS
EXPERIMENTAL DATA
FLUORINE IONS
HYDROGEN
HYDROGEN COMPOUNDS
HYDROGEN DEUTERIDE
HYDROGEN ISOTOPES
INFORMATION
ION COLLISIONS
ION-MOLECULE COLLISIONS
IONS
ISOTOPES
LIGHT NUCLEI
MOLECULE COLLISIONS
NONMETALS
NUCLEI
NUMERICAL DATA
ODD-ODD NUCLEI
STABLE ISOTOPES
TOTAL CROSS SECTIONS