Predicted term energies, wavelengths and oscillator strengths for transitions involving high-nl Rydberg states in C II, C III and C IV*
Astrophysique et Spectroscopie, Université de Mons-Hainaut, B-7000 Mons, Belgium
Accepted: 10 November 1997
Predicted term energies for values of the principal quantum number up to 30 and orbital quantum numbers l ≥ 3 in C II, C III and C IV have been obtained using the Ritz and the polarization formulae. Wavelength predictions for lines involving these high-nl term energies together with the corresponding oscillator strengths, calculated by the HFR approach, are also reported in the present paper. Some astrophysical implications of these new atomic data are discussed by means of a comparison with the observed spectra of the planetary nebula NGC 7027.
Key words: atomic data / planetary nebulae: NGC 7027
© European Southern Observatory (ESO), 1998