Autoionizing resonances in electron-impact excitation of oxygenlike selenium
We have investigated the contributions of doubly excited, autoionizing resonances to the rate coefficients for electron-impact excitation of the n = 2 to n = 2 transitions in oxygenlike selenium. The cross sections for direct excitation were calculated using a relativistic distorted-wave approximation. The detailed Auger and radiative rates required for evaluating the resonance contributions were calculated using a multiconfigurational Dirac-Fock model. The largest effect is on the electric-dipole-forbidden transitions. For some J = 0 to J = 0 transitions involving two-electron excitations, the resonances enhance the collisional excitation rates by factors up to 10/sup 4/ at electron temperatures relevant for laboratory plasmas.
- Research Organization:
- High Temperature Physics Division, Lawrence Livermore National Laboratory, Livermore, California 94550
- OSTI ID:
- 7065546
- Journal Information:
- Phys. Rev. A; (United States), Journal Name: Phys. Rev. A; (United States) Vol. 38:7; ISSN PLRAA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
Molecular & Chemical Physics-- Collision Phenomena
74 ATOMIC AND MOLECULAR PHYSICS
ATOMS
AUGMENTATION
AUTOIONIZATION
CHARGED PARTICLES
COLLISIONS
CROSS SECTIONS
DISTORTED WAVE THEORY
ELECTRON COLLISIONS
ELECTRON-ION COLLISIONS
ELEMENTS
ENERGY-LEVEL TRANSITIONS
EXCITATION
ION COLLISIONS
IONIZATION
IONS
ISOELECTRONIC ATOMS
KINETICS
NONMETALS
OXYGEN
PLASMA
RESONANCE
SELENIUM IONS
USES