Coincidence studies of capture and ionization in highly charged I sup q + -He and U sup q + -He collisions at medium velocities
- Physics Division, Oak Ridge National Laboratory, P.O. Box 2008, Oak Ridge, Tennessee 37831-6377 (USA)
Electron capture and ionization processes were investigated for I{sup {ital q}+}-He and U{sup {ital q}+}-He collisions at incident energies 0.1--1.0 MeV/nucleon and for incident charge states {ital q}=5--44. Cross sections for single-electron capture, transfer ionization, single ionization, and double ionization were obtained using a projectile-ion recoil-ion coincidence technique. A pronounced interplay among the different electronic processes was observed. Cross sections for single ionization show a rather weak charge-state dependence, in disagreement with recent calculations of McKenzie and Olson (Phys. Rev. A 35, 2863 (1987)). In a second experiment, photon recoil-ion coincidences were measured to obtain partial cross sections for capture into certain projectile {ital n} states. These measurements provide strong evidence that transfer ionization populates lower projectile {ital n} states than does single-electron capture. Zero-degree electron spectroscopy, coincident with charge capture for 0.5 MeV/nucleon U{sup 30+} projectiles revealed that the free electron in transfer ionization is released from the projectile to its continuum and from high-lying Rydberg states of the projectile.
- DOE Contract Number:
- AC05-84OR21400
- OSTI ID:
- 6829807
- Journal Information:
- Physical Review, A (General Physics); (USA), Journal Name: Physical Review, A (General Physics); (USA) Vol. 41:7; ISSN PLRAA; ISSN 0556-2791
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
Molecular & Chemical Physics-- Collision Phenomena
74 ATOMIC AND MOLECULAR PHYSICS
ATOM COLLISIONS
CAPTURE
CHARGED PARTICLES
COINCIDENCE METHODS
COLLISIONS
COUNTING TECHNIQUES
CROSS SECTIONS
ELECTRON CAPTURE
ELEMENTS
ENERGY RANGE
FLUIDS
GASES
HELIUM
IODINE IONS
ION COLLISIONS
ION-ATOM COLLISIONS
IONIZATION
IONS
MANY-BODY PROBLEM
MEV RANGE
MEV RANGE 10-100
MULTICHARGED IONS
NONMETALS
RARE GASES
RECOILS
TWO-BODY PROBLEM
URANIUM IONS