Coincident detection of electrons ejected at large angles and target recoil ions produced in multiply-ionizing collisions for the 1 MeV/u O[sup q+] (q = 4,7) + Ar collision system

Thesis/Dissertation · Wed Jan 01 04:00:00 EST 1992

OSTI ID:6971997

Gaither, III, C C

The author has designed and constructed a new multi-spectrometer system for use in ion-atom collision experiments. This new multi-spectrometer system can detect electrons ejected at 0[degrees], 180[degrees], and into a angular range from about 45[degrees] to about 135[degrees] measured relative to the incident beam direction as well as the recoil ions produced in ion-atom collisions. In these experiments the author has measured, in coincidence, the angular distributions of electrons ejected into an angular range from about 45[degrees] to about 135[degrees] relative to the incident beam direction and the target recoil ions produced in multiply-ionizing collisions for the 1 MeV/u O[sup q+] ( q= 4,7) + Ar collision systems. These measurement have been performed for 179 eV, 345 eV, and 505 eV electrons. Additionally, the author has measured the energy distributions of electrons ejected into specific angular regions. The goal of the experiments is to determine whether of not binary encounter precesses alone can explain the angular distributions of electrons ejected at large angles in multiply ionizing collisions. The angular distributions measured for each electron energy are strongly peaked in the forward direction. The results are consistent with the dominant product mechanism for electrons ejected at large angles being a binary encounter process. No evidence is seen for [open quotes]hot[close quotes] electrons, which are energetic electrons ejected at large angles from the incident beam direction in addition to binary encounter electrons. Differential cross sections have been calculated from these angular distributions. They are on the order of 10[sup [minus]21] cm[sup 2]/eV ster.

• Research Organization: Tennessee Univ., Knoxville, TN (United States)
• OSTI ID: 6971997
• 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
CHARGED PARTICLES
COINCIDENCE METHODS
COINCIDENCE SPECTROMETRY
COLLISIONS
COUNTING TECHNIQUES
DISTRIBUTION
ELECTRONS
ELEMENTARY PARTICLES
ELEMENTS
ENERGY RANGE
EV RANGE
EV RANGE 100-1000
FERMIONS
FLUIDS
GASES
ION COLLISIONS
ION-ATOM COLLISIONS
IONS
LEPTONS
MULTICHARGED IONS
NONMETALS
OXYGEN IONS
RARE GASES