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Some experimental results concerning low-temperature emission intensity, decay times, and activator concentration dependence of the 4750-{} KCl: Tl emission are reported in order to clarify its origin. According to the experimental features, this emission is attributed to the de-excitation of the ³A₁ᵤ state, directly excited by the transition ¹A1g→³A₁ᵤ, as an alternative to the several discordant interpretations already given.
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Ranfagni et al. (1972) studied this question.
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