Transition probabilities in Cr I.
Abstract
Branching fractions have been measured for 60 Cr I lines that originate from 14 different upper levels, with energies ranging from 3.3 to 6.9 eV. The measurements, obtained on the solar Fourier-Transform Spectrometer on Kitt Peak, cover a wavelength range extending from about 290 to 900 nm. The branching fractions, together with level lifetimes determined by use of laser excitation by Kwiatkowski et al. (1981), yield transition probabilities with an accuracy of about 7 percent. A comparison with the precision data determined in an absorption experiment at Oxford by Blackwell, Menon and Petford (1982, 1983, 1984) shows no systematic trends, and thus provides for the first time an independent upper limit on the claimed uncertainty of the Oxford data.
- Publication:
-
Monthly Notices of the Royal Astronomical Society
- Pub Date:
- November 1985
- DOI:
- 10.1093/mnras/217.2.423
- Bibcode:
- 1985MNRAS.217..423T
- Keywords:
-
- Chromium;
- Line Spectra;
- Photosphere;
- Solar Physics;
- Transition Probabilities;
- Data Reduction;
- Infrared Spectra;
- Oscillator Strengths;
- Visible Spectrum;
- Solar Physics