Double- and single-electron capture and loss in collisions of 1--2-MeV/u boron, oxygen, and silicon projectiles with helium atoms
Single- and double-electron-capture cross sections were measured for 1--2-MeV/u bare B/sup 5+/, O/sup 8+/, and Si/sup 14+/ projectiles in collisions with helium atoms. The measured double-electron-capture cross sections are 2--3 orders of magnitude smaller than corresponding single-capture cross sections. The single-capture cross sections are well described by continuum-distorted-wave calculations. For B/sup 5+/, the double-capture cross sections at high velocities are in reasonable agreement with scaled Oppenheimer-Brinkman-Kramers calculations, assuming capture of independent electrons. Cross sections for electron capture and loss are also reported for nonbare ions (O/sup 6+/, O/sup 7+/, Si/sup 8+/, and Si/sup 13+/). Single-capture cross sections for nonbare ions are about 30% smaller than corresponding cross sections for bare ions with the same ionic charge q. The reported electron-loss cross sections are well described as ionization of an ion by an incident helium nucleus and two free electrons, using theoretical ionization cross sections in the Born approximation.
- Research Organization:
- Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831
- DOE Contract Number:
- AC05-84OR21400
- OSTI ID:
- 6750718
- Journal Information:
- Phys. Rev. A; (United States), Vol. 35:2
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
BORON IONS
ION-ATOM COLLISIONS
HELIUM
OXYGEN IONS
SILICON IONS
BRINKMAN-KRAMERS APPROXIMATION
CROSS SECTIONS
ELECTRON CAPTURE
ELECTRON CORRELATION
ELECTRON LOSS
MEV RANGE 01-10
MULTICHARGED IONS
ATOM COLLISIONS
CAPTURE
CHARGED PARTICLES
COLLISIONS
CORRELATIONS
ELEMENTS
ENERGY RANGE
FLUIDS
GASES
ION COLLISIONS
IONS
MEV RANGE
NONMETALS
RARE GASES
640304* - Atomic
Molecular & Chemical Physics- Collision Phenomena