The intercombination lines of the zinc sequence corresponding to the transition 4s4p ³{P}₁→4{s}²$ ${}¹S₀ have been observed for xenon, lanthanum, neodymium, europium, gadolinium, and ytterbium in the Princeton Large Torus tokamak discharges.
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Hinnov et al. (1987) studied this question.
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