Electron impact excitation of the 3s23p4 levels of Ar III
Abstract
Collision strengths were calculated for electron excitation of the 3s23p43p(e)0,1,2,1D(e)2 and 1S(e)0 levels of Ar III using the R-matrix method. The five states 3s23p4 3p(e),1D(e),1S(e), and 3s3p5 3p(0), 1P(0) were included, which are represented by configuration interaction wavefunctions. These wavefunctions yield oscillator strengths for allowed transitions between the levels which are in good agreement with the experimental values. Reactance matrices were obtained in LS coupling and were transformed using JAJOM to give the fine-structure collision strengths. The latter have been averaged over a Maxwellian electron velocity distribution to give the effective collision strengths, for temperatures from 4000 to 24,000 K. The calculated electron excitation rates are up to 50 percent larger than previous values at 10,000 K due to resonance structure in the collision strengths.
- Publication:
-
Journal of Physics B Atomic Molecular Physics
- Pub Date:
- October 1990
- DOI:
- 10.1088/0953-4075/23/19/021
- Bibcode:
- 1990JPhB...23.3393J
- Keywords:
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- Argon;
- Electron Impact;
- Electron States;
- Quantum Numbers;
- Wave Functions;
- Emission Spectra;
- H Ii Regions;
- Maxwell-Boltzmann Density Function;
- Oscillator Strengths;
- Spin-Orbit Interactions;
- Atomic and Molecular Physics