Oscillator strengths for transitions among the lowlying energy levels of S II
Abstract
Accurate largescale C I calculations of the oscillator strengths for transitions among the energy levels of the lowlying 3s2 3p3, 3s2 3p2(3P)4p, 3s 3p4, 3s2 3p2(3p)4s, and 3s2 3p2(3P)3d configurations of S II in the LS coupling approximation are presented, with special attention given to oscillator strengths for the astrophysically important transitions 3s2 3p3 4S0_{3/2} to 3s 3p4 4Pe_{1/2,} 3/2, and 5/2. These oscillator strengths are shown to be small due to the cancellation of relatively large contributions to the transition matrix elements from the 3s 3p4 and 3s2 3p2 3d configurations in the final state. The present theoretical estimates of the oscillator strengths for transitions to the finestructure levels are found to lie within 5 percent of the experimentallydetermined values.
 Publication:

Journal of Physics B Atomic Molecular Physics
 Pub Date:
 April 1989
 DOI:
 10.1088/09534075/22/8/008
 Bibcode:
 1989JPhB...22.1153O
 Keywords:

 Atomic Structure;
 Energy Levels;
 Interstellar Matter;
 Oscillator Strengths;
 Quantum Mechanics;
 Ultraviolet Absorption;
 Hamiltonian Functions;
 Matrices (Mathematics);
 SatelliteBorne Instruments;
 Schroedinger Equation;
 Astrophysics