Excitation and ionization of highly charged ions by electron impact. Progress report, January 1, 1982 to April 30, 1983
Preliminary work has been done on extension to Mg-like and Al-like ions of the simple method recently used to calculate total ionization cross sections for Na-like ions with excitation-autoionization contributions included. Collision strengths ..cap omega.. and electric-dipole radiative line strengths S have been calculated for excitation of all the doubly-excited levels with n = 2 in He-like ions. The results were obtained for 19 values for the nuclear charge number z in the range 6 less than or equal to Z less than or equal to 74. Similar calculations have also been made for excitation from the levels with n = 1 and 2 to all singly-excited levels with higher n less than or equal to 5 in He-like ions. The results were obtained for 20 values for Z in the range 4 less than or equal to Z less than or equal to 74. Calculations of ..cap omega.. and S have been made for all 359 fine structure transitions between levels of the 2l/sub a/2l/sub b/ configurations and those of the 2l/sub a/'3/sub b/' configurations in Be-like ions. The results were obtained for 17 values of Z in the range 10 less than or equal to Z less than or equal to 74. The computer programs for treating ions with three valence electrons have been rewritten for improved efficiency and have been used to calculate ..cap omega.. and S for all innershell excitation transitions from levels of the 1s/sup 2/2s and 1s/sup 2/2p configurations to those of the 1s2l/sub a/2l/sub b/ configurations in Li-like ions. Results were obtained for 18 values for Z in the range 8 less than or equal to Z less than or equal to 74. In all cases the collision strengths have been fitted to simple functions of the impact electron energy that are readily integrated over a Maxwellian to obtain collision rates. Recent improvements in the method of calculation and plans for future work are briefly discussed.
- Research Organization:
- Pennsylvania State Univ., University Park (USA)
- DOE Contract Number:
- AC02-76ET53056
- OSTI ID:
- 6048059
- Report Number(s):
- DOE/ET/53056-06; ON: DE83014469; TRN: 83-019381
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ALUMINIUM IONS
ELECTRON-ION COLLISIONS
CROSS SECTIONS
MAGNESIUM IONS
COMPUTER CALCULATIONS
EXCITATION
IONIZATION
ISOELECTRONIC ATOMS
MAXWELL EQUATIONS
ATOMS
CHARGED PARTICLES
COLLISIONS
DIFFERENTIAL EQUATIONS
ELECTRON COLLISIONS
ENERGY-LEVEL TRANSITIONS
EQUATIONS
ION COLLISIONS
IONS
PARTIAL DIFFERENTIAL EQUATIONS
640304* - Atomic
Molecular & Chemical Physics- Collision Phenomena