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    Observation and interpretation of the Tm 3+ free ion spectrum

    The emission spectrum of thulium produced by a vacuum spark source was observed in the wavelength range from 700 to 2320 Å on the 10.7 m normal-incidence vacuum ultraviolet spectrograph at the Paris-Meudon...

    A. Meftah, J.-F. Wyart, N. Champion, L. Tchang-Brillet in The European Physical Journal D (2007)