Electron-impact collision strengths for excitation of He-like ions from the levels with n = 1 and 2 to all singly excited levels with higher n< or =5
Intermediate-coupling collision strengths have been calculated for all transitions of the kind 1s2p/sup 2S/+1P/sub J/-1sn'l'/sup 2S/'+1L'/sub J//sub '/ with n' = 3,4, and 5 and l'> or =1 (p, d, f, g) for 20 He-like ions with nuclear charge number Z in the range 4< or =Z< or =74. The method used is a Coulomb-Born-Exchange method that is especially well suited for calculating results for many members of an isoelectronic sequence simultaneously. The calculations were made for nine impact-electron energies in threshold units epsilon = 1.0, 1.2, 1.5, 1.9, 2.5, 4.0, 6.0, 10.0, and 15.0. The results are given in the form of fits to a simple function of epsilon that is readily integrated over a Maxwellian to obtain collision rates. The parameters required in obtaining collision strengths for the simpler transitions from the 1s2p levels to the 1sn's levels with 3< or =n'< or =5 and for the transitions from the ground level and the 1s2s levels to all singly excited levels with higher n values < or =5 are given, as well. Results for transitions between energy terms and their jj coupling analogs are also included. In addition, calculated values for the transition energies and the electric-dipole radiative line strengths are given for all transitions.
- Research Organization:
- Department of Astronomy, The Pennsylvania State University, University Park, Pennsylvania 16802
- DOE Contract Number:
- AC02-76ET53056
- OSTI ID:
- 5092805
- Journal Information:
- At. Data Nucl. Data Tables; (United States), Vol. 29:3
- Country of Publication:
- United States
- Language:
- English
Similar Records
Electron-impact collision strengths for inner-shell excitation of doubly excited levels from singly excited levels in He-like ions
Intermediate-coupling collision strengths for transitions between doubly excited levels produced by electron impact on highly charged He-like ions
Related Subjects
ARGON IONS
ELECTRON-ION COLLISIONS
BERYLLIUM IONS
CADMIUM IONS
CALCIUM IONS
CARBON IONS
EXCITATION
CHROMIUM IONS
GADOLINIUM IONS
IRON IONS
KRYPTON IONS
MAGNESIUM IONS
MOLYBDENUM IONS
NEON IONS
NICKEL IONS
OXYGEN IONS
SILICON IONS
SULFUR IONS
TITANIUM IONS
TUNGSTEN IONS
XENON IONS
ZINC IONS
DATA COMPILATION
FINE STRUCTURE
J-J COUPLING
CHARGED PARTICLES
COLLISIONS
COUPLING
DATA
ELECTRON COLLISIONS
ENERGY-LEVEL TRANSITIONS
INFORMATION
INTERMEDIATE COUPLING
ION COLLISIONS
IONS
NUMERICAL DATA
640304* - Atomic
Molecular & Chemical Physics- Collision Phenomena