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Energy distribution of H/sup -/ from the collision-induced three-particle breakup of H/sub 3//sup +/

Journal Article · · Phys. Rev. A; (United States)
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We have measured the laboratory energy distribution of H/sup -/ produced by the collision-induced dissociation of H/sub 3//sup +/ from He targets for incoming beam energies ranging from 2.417 to 7.0 keV. An approximate projectile frame energy distribution of H/sup -/ is also obtained. The most probable H/sup -/ projectile frame energy is estimated to be approximately 0.75 eV. We have also determined, from the shift in the position of the H/sup -/ laboratory peaks, an inelastic energy loss of 60 +- 12 eV for the excited H/sub 3//sup +/ ions producing near zero kinetic energies of H/sup -/ in the projectile frame. Our results suggest that H/sup -/ is produced by the electronic excitation of H/sub 3//sup +/ with subsequent dissociation into H/sup +/+H/sup +/+H/sup -/. In this case the motion of the two H/sup +/ ions is highly correlated. For the most probable c.m. energy of H/sup -/, we put a lower limit of 163/sup 0/ on the correlation angle between the protons in the c.m. of dissociating H/sub 3//sup +/.
Research Organization:
Behlen Laboratory of Physics, University of Nebraska, Lincoln, Nebraska 68588-0111
OSTI ID:
6533155
Journal Information:
Phys. Rev. A; (United States), Journal Name: Phys. Rev. A; (United States) Vol. 39:4; ISSN PLRAA
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
ANGULAR CORRELATION
ANIONS
ATOM COLLISIONS
CATIONS
CHARGED PARTICLES
COLLISIONS
CORRELATIONS
DATA
DISSOCIATION
ELEMENTS
ENERGY RANGE
ENERGY SPECTRA
ENERGY-LEVEL TRANSITIONS
EXCITATION
EXPERIMENTAL DATA
FLUIDS
GASES
HELIUM
HYDROGEN IONS
HYDROGEN IONS 1 MINUS
HYDROGEN IONS 3 PLUS
INFORMATION
ION COLLISIONS
ION-ATOM COLLISIONS
IONS
KEV RANGE
KEV RANGE 01-10
MOLECULAR IONS
NONMETALS
NUMERICAL DATA
RARE GASES
SPECTRA