Abstract
IN our letter to NATURE of March 10, 1923, we gave a preliminary list of the most prominent lines between 2500 and 3500 Å. U. in the arc spectrum of the new element hafnium, discovered by Coster and Hevesy (see NATURE, January 20, February 24, April 7, 1923). In this list we included only lines of intensity of 2½ and more, using a scale of intensity from ½ to 6. Prof. Hevesy has now been able to supply us with a pure hafnium preparation containing according to X-ray analysis not more than about 1 per cent. zirconium, and in addition small traces of titanium, manganese, and niobium. With this preparation we have photographed both the arc and the spark spectrum of hafnium. As to the arc spectrum, we have controlled all our older measurements of the published lines, and also of the weaker unpublished lines, and have added to these a considerable number of still weaker lines.
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HANSEN, H., WERNER, S. The Optical Spectrum of Hafnium. Nature 112, 618–619 (1923). https://doi.org/10.1038/112618b0
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DOI: https://doi.org/10.1038/112618b0
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