Abstract
Umbral spectra are shown to contain an absorption feature attributable to the Tl i transition 6p 2 P°3/2−7s 2 S 1/2 at 5350 Å. Analysis of the umbral spectrum suggests a solar abundance in the 0.72< log N(Tl)T<1.10 on the standard scale log N(H) = 12.00. Unidentified blends limit the accuracy of the abundance determination.
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Lambert, D.L., Mallia, E.A. & Smith, G. Thallium in the solar atmosphere. Sol Phys 26, 250–256 (1972). https://doi.org/10.1007/BF00155124
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DOI: https://doi.org/10.1007/BF00155124