Absolute oscillator strengths for chromium and the chromium solar abundance

Abstract

Using the method of total absorption for weak lines on the linear part of the curve of growth, we measured absolute oscillator strengths for the ultraviolet (3600 A) transitions a 7S -y 7P02,3,4 and for the violet (4275 A) transitions a7S3-z7P0 .a. . The oscillator strengths measured by total absorption agree well with other measurements made by the lifetime, beam-foil, and hook methods. An absolute scale was established for several extensive compilations of oscillator strengths for chromium transitions with lower level energy, 0.94 eV -<Xi < 1.03 eV. Application of this absolute scale to several calculations of the solar chromium abundance resulted in the best value: log10 (NcriNH) = 5.31 Subject headings: laboratory spectra - Sun: abundance - transition probabilities