A critical study of discrepancies between theoretical and experimental oscillator strengths for Cr I.
Abstract
Theoretical Hartree-Fock oscillator strengths for Cr I calculated by Froese Fischer (1973) and semiempirical values computed by Biemont (1974) and by Kurucz and Peytremann (1975) are inconsistent with the recent measured values of Bieniewski (1976) and Becker et al. (1977). It is shown that the Froese Fischer and Biemont calculations have a phase error that leads to an overestimate of the gf-values. Kurucz and Peytremann incorrectly assigned two terms in their least-squares determination of the eigenvectors, which resulted in an underestimate of the gf-values for two of the lines. When these errors are corrected, there is approximate agreement between theory and measurement. Additional radial integrals have been determined by a fit to experimental line strengths and are compared with the theoretical values of other authors.
- Publication:
-
Astronomy and Astrophysics
- Pub Date:
- September 1977
- Bibcode:
- 1977A&A....60..389B
- Keywords:
-
- Chromium;
- Error Analysis;
- Molecular Oscillators;
- Transition Probabilities;
- Angular Momentum;
- Eigenvectors;
- Electric Dipoles;
- Least Squares Method;
- Astrophysics