Abstract
THE spectrum of ionised titanium is very interesting, owing to the fact that a large number of chief lines lie between =3000 and =4500, and hence enhanced lines of titanium form a very characteristic feature of the spectrum of the solar chromosphere and the stars. As regards the chromospheric spectrum, lines of Ti+ at =3685, 3759, 3761 reach a height of 6000 km., and many other lines reach heights exceeding 1500 km., while resonance lines of titanium (=5193.12, 5173.92, 5210.59)—following the classification given by Kiess and Kiess—reach heights of 500 km. only. In this respect the behaviour of titanium is parallel to that of calcium, both as regards the ordinary as well as the enhanced lines, though owing to the larger atomic weight, titanium fails to reach the great height of Ca+, as given by the H and K lines. Also no lines of Ti+ dominate the spectrum to the same extent as the H and K lines dominate the spectrum of Ca+.
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SUR, N. Regularities in the Spectrum of Ionised Titanium. Nature 114, 611 (1924). https://doi.org/10.1038/114611a0
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DOI: https://doi.org/10.1038/114611a0
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