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Angular distributions for H/sup -/ formation in single collisions of H/sup +/ on Mg

Journal Article · · Phys. Rev. A; (United States)
; ;
Absolute differential cross sections have been measured for H/sup -/ formation in single collisions of H/sup +/ on Mg in the energy range from 0.5 to 5.0 keV. Total cross sections, obtained by direct integration of these differential cross sections, are in good agreement with earlier total-cross-section measurements of Morgan and Eriksen in the energy range common to the two experiments and are in good agreement with the calculated total cross sections of Olson and Liu. The differential cross sections are strongly peaked in the forward direction. The functional form and scaling properties of this forward peak strongly indicate that it is a glory maximum, which occurs when the classical deflection function changes over from attractive to repulsive at some finite impact parameter. The differential cross sections from 1.0 to 5.0 keV show no other structure, but below 1.0 keV a tau-dependent structure is observed which becomes more pronounced as the collision energy decreases.
Research Organization:
Instituto de Fisica, Universidad Nacional Autonoma de Mexico, Mexico 20, D.F.
OSTI ID:
6769080
Journal Information:
Phys. Rev. A; (United States), Journal Name: Phys. Rev. A; (United States) Vol. 26:1; 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
ALKALINE EARTH METALS
ANGULAR DISTRIBUTION
ANIONS
ATOM COLLISIONS
CATIONS
CHARGE EXCHANGE
CHARGED PARTICLES
COLLISIONS
CROSS SECTIONS
DATA
DIFFERENTIAL CROSS SECTIONS
DISTRIBUTION
ELEMENTS
ENERGY RANGE
EV RANGE
EV RANGE 100-1000
EXPERIMENTAL DATA
HYDROGEN IONS
HYDROGEN IONS 1 MINUS
HYDROGEN IONS 1 PLUS
IMPACT PARAMETER
INFORMATION
ION COLLISIONS
ION-ATOM COLLISIONS
IONS
KEV RANGE
KEV RANGE 01-10
MAGNESIUM
METALS
NUMERICAL DATA
SCALING LAWS