Oscillator strengths for the 3s²3p(²P⁰)→3s3p²(²S^e) and 3s²3p(²P⁰)→3s3p²(²D^e) transitions of Al I

Abstract

Calculations of oscillator strengths for the 3s23p(2P0) to 3s3p2(2Se) and 3s23p(2P0) to 3s3p2(2De) transitions of Al I have been carried out. Variational atomic Bethe-Goldstone calculations reported here give a very good account of the empirical excitation energy. Oscillator strengths are computed using both length and velocity formulae. The agreement between these two formulae and with experiment is excellent. The results are compared with previous calculations which introduced electronic correlations by configuration interaction. The present calculations indicate that, when electronic correlations are properly introduced, length and velocity formulae give equivalent results.