We have studied the spectra of scandium (600-6 000 Å) with the beam-foil method. In the v.u.v. a few previously unreported Sc III transitions appeared, as well as several well-known Sc III multiplets, whereas most lines in the air region were ascribed to earlier classified Sc I and Sc II transitions. We also measured the mean lifetimes of 20 excited Sc I-Sc III levels and generally found good agreement with previous theoretical calculations and emission measurements.
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Buchta et al. (1971) studied this question.
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