Backward ejected electrons produced by 1-MeV/u O[sup [ital q]+] ([ital q]=3--8) projectile ions colliding with argon gas

The cross sections for ejecting electrons into a cone of half-angle [similar to]2[degree] centered on the backward direction have been measured as a function of electron energy for 1-MeV/u O[sup [ital q]+] ([ital q]=3--8) projectiles colliding with Ar. For O[sup 3+] and O[sup 4+] projectiles, the cr...

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Bibliographic Details
Published in:Physical review. A, Atomic, molecular, and optical physics Atomic, molecular, and optical physics, 1994-12, Vol.50:6
Main Authors: Breinig, M., Berryman, J.W., Segner, F., Desai, D.D.
Format: Article
Language:English
Subjects:
664300 - Atomic & Molecular Physics- Collision Phenomena- (1992-)
ARGON
ATOM COLLISIONS
ATOMIC AND MOLECULAR PHYSICS
AUGER EFFECT
BACKSCATTERING
CHARGE STATES
CHARGED PARTICLES
COLLISIONS
CROSS SECTIONS
ELECTRON EMISSION
ELEMENTS
EMISSION
ENERGY RANGE
FLUIDS
GASES
ION COLLISIONS
ION-ATOM COLLISIONS
IONIZATION
IONS
MEV RANGE
MEV RANGE 10-100
MULTICHARGED IONS
NONMETALS
OXYGEN IONS
RARE GASES
SCATTERING
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Summary:The cross sections for ejecting electrons into a cone of half-angle [similar to]2[degree] centered on the backward direction have been measured as a function of electron energy for 1-MeV/u O[sup [ital q]+] ([ital q]=3--8) projectiles colliding with Ar. For O[sup 3+] and O[sup 4+] projectiles, the cross sections have also been measured in coincidence with exit charge states ([ital q]+1) and ([ital q]+2) of the projectile. A prominent feature in all spectra is a target [ital LMM] Auger peak. The cross sections for producing Ar [ital LMM] Auger electrons are nearly independent of projectile incident charge states. A projectile electron-loss peak is produced when the projectile brings loosely bound [ital L]-shell electrons into the collision. The shape of this peak is independent of the projectile exit charge state within experimental error. The measured electron-loss production cross sections at 180[degree] are compared with the predictions of various on-shell approximations to the impulse approximation. Peak height and position are sensitive functions of the on-shell approximation used. The predictions of the elastic scattering model agree well with the data.
ISSN:1050-2947
1094-1622
DOI:10.1103/PhysRevA.50.4905