Forward electron emission in C[sup [ital q]+]-He collisions

Journal Article · Fri Jul 01 04:00:00 EDT 1994 · Physical Review A; (United States)

DOI:https://doi.org/10.1103/PhysRevA.50.364· OSTI ID:7112292

DuBois, R D ^[1]

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1. Pacific Northwest Laboratory, Richland, Washington 99352 (United States)

Differential cross sections are presented for 15[degree] and 20[degree] electron emission in 100- and 150-keV/u C[sup [ital q]+]-He collisions where the projectile charge states are 0 to 4+. Coincidences between electrons emitted at 20[degree] and projectiles which captured or lost electrons in the collisions were also measured. The coincidence and noncoincidence data are used to demonstrate how partial screening of the projectile nuclear charge and direct interactions between projectile and target electrons influence the electron emission. In addition, the relative importance of multielectron transitions associated with either electron capture or electron loss by the projectile is demonstrated. Finally, the data are used to test whether saddle-point ionization is important in these ionizing collisions, as has recently been suggested. The present data do not support this suggestion and are in disagreement with the measurements which do support it. Furthermore, it is demonstrated that dressed ion impact data are inappropriate for testing for a saddle-point ionization mechanism.

• DOE Contract Number: AC06-76RL01830
• OSTI ID: 7112292
• Journal Information: Physical Review A; (United States), Journal Name: Physical Review A; (United States) Vol. 50:1; ISSN 1050-2947; ISSN PLRAAN
• Country of Publication: United States
• Language: English

Related Subjects

664300* -- Atomic & Molecular Physics-- Collision Phenomena-- (1992-)
74 ATOMIC AND MOLECULAR PHYSICS
ANGULAR DISTRIBUTION
ATOM COLLISIONS
CALCULATION METHODS
CAPTURE
CARBON IONS
CHARGED PARTICLES
COINCIDENCE METHODS
COLLISIONS
COUNTING TECHNIQUES
CROSS SECTIONS
DIFFERENTIAL CROSS SECTIONS
DISTRIBUTION
ELECTRON CAPTURE
ELECTRON EMISSION
ELEMENTS
EMISSION
ENERGY RANGE
ENERGY SPECTRA
FLUIDS
GASES
HELIUM
ION COLLISIONS
ION-ATOM COLLISIONS
IONIZATION
IONS
KEV RANGE
KEV RANGE 100-1000
MULTICHARGED IONS
NONMETALS
RARE GASES
SADDLE-POINT METHOD
SCATTERING
SMALL ANGLE SCATTERING
SPECTRA