Physics – General Physics
Scientific paper
Jul 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985phrva..32...93c&link_type=abstract
Physical Review A - General Physics, 3rd Series (ISSN 0556-2791), vol. 32, July 1985, p. 93-104. Research supported by the U.S.
Physics
General Physics
15
Electron Impact, Electron Transitions, Ion Scattering, Iron, Isoelectronic Sequence, Magnesium, Electric Dipoles, Excitation, Metal Ions, Quantum Theory, Resonance, Stellar Spectra, Tokamak Devices, Transition Probabilities
Scientific paper
Collision strengths in intermediate coupling are calculated for a number of transitions in Fe XV at energies up to several times the threshold energies. Calculations are carried out in a ten-state distorted wave approximation. Resonance effects are considered by using multichannel quantum-defect theory, and relativistic effects in the target Hamiltonian are taken into account in the Breit-Pauli formulation. It is found that resonances increase the effective cross section for the 3s2 1S0 - 3s 3p 3P1 transition in the important resonance region by more than a factor of two over previous nonresonant results. Cross sections for other transitions that effectively populate the 3P1 states by radiative cascade are also found to be larger. Both effects tend to substantially increase the calculated emission from the 3P1 state.
Christensen R. B.
Norcross D. W.
Pradhan Anil Kumar
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