Coincident detection of electrons ejected at large angles and target recoil ions produced in multiply ionizing collisions for the 1-MeV/u O[sup [ital q]+]+Ar collision system

Journal Article · Sat May 01 04:00:00 EDT 1993 · Physical Review A; (United States)

DOI:https://doi.org/10.1103/PhysRevA.47.3878· OSTI ID:6873151

Gaither, III, C C; Breinig, M; Berryman, J W; Hasson, B F; Richards, J D; Price, K ^[1]

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1. University of Tennessee, Knoxville, Tennessee 37996-1200 (United States) Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6377 (United States)

The angular distributions of energetic electrons ejected at angles between 45[degree] and 135[degree] with respect to the incident-beam direction have been measured in coincidence with the charge states of the target recoil ions produced in multiply ionizing collisions for the 1-MeV/u O[sup [ital q]+] ([ital q]=4,7)+Ar collision systems. These measurements have been made for [similar to]179-, [similar to]345-, and [similar to]505-eV electrons. Additionally, the energy distributions of electrons ejected into specific angular regions have been measured. Ar [ital LMM] satellite Auger electrons appear as a peak in the energy spectrum of electrons ejected at all large angles. The center of this peak is found at an electron energy of [similar to]179 eV. Electrons with [similar to]179 eV energy, ejected at large angles, are preferentially produced in coincidence with recoil ions of charge state 4+. Electrons with [similar to]345 eV energy and [similar to]505 eV energy ejected at large angles are preferentially produced in coincidence with recoil ions of charge state 3+. The angular distributions for these electrons are strongly peaked in the forward direction; essentially no electrons are observed at angles larger than 90[degree]. These results are consistent with the dominant production mechanism for energetic electrons ejected at large angles being a binary-encounter process. Differential cross sections have been calculated from these angular distributions. They are on the order of 10[sup [minus]21] cm[sup 2]/(eV sr).

• DOE Contract Number: AC05-84OR21400
• OSTI ID: 6873151
• Journal Information: Physical Review A; (United States), Journal Name: Physical Review A; (United States) Vol. 47:5; 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
ARGON
ATOM COLLISIONS
BATTERY CHARGE STATE
CHARGED PARTICLES
COINCIDENCE METHODS
COLLISIONS
COUNTING TECHNIQUES
DISTRIBUTION
ELECTRON EMISSION
ELEMENTS
EMISSION
ENERGY RANGE
FLUIDS
GASES
INNER-SHELL IONIZATION
ION COLLISIONS
ION-ATOM COLLISIONS
IONIZATION
IONS
MEV RANGE
MEV RANGE 01-10
MULTICHARGED IONS
NONMETALS
OXYGEN IONS
RARE GASES
RECOILS
TARGETS