Oscillator strengths and transition probabilities of electric dipole transi
tions among the fine-structure levels of the 3s(2)3p, 3s3p(2), 3s(2)3d, 3s(
2)4s, 3p(3), 3s3p3d, 3s(2)4p, 3s(2)4d, 3s(2)4f and 3s3p4s configurations an
d of spin-forbidden electric dipole transitions among the levels of the 3s(
2)3p, 3s3p(2) and 3s(2)3d configurations of S3+ are calculated using fairly
extensive configuration-interaction wavefunctions. The relativistic correc
tions are included through the Breit-Pauli Hamiltonian. The calculated exci
ted energies are in close agreement with measurement. Small adjustments to
the diagonal elements of the Hamiltonian matrices are made to further bring
calculated energy separations between levels as close as possible to the m
easured values. The present results are compared with other available calcu
lations and experiments and significant discrepancies are noted for some tr
ansitions.