Transition probabilities in CR I

Details Transition probabilities in CR I Transition probabilities in CR I

Nov 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985mnras.217..423t&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 217, Nov. 15, 1985, p. 423-434. Research supported by S

Physics

16

Chromium, Line Spectra, Photosphere, Solar Physics, Transition Probabilities, Data Reduction, Infrared Spectra, Oscillator Strengths, Visible Spectrum

Scientific paper

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.

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