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The quantum-mechanical single-configurational-coordinate model is used to interpret Y2O2S:Eu+3 and La2O2S:Eu+3 7F→charge-transfer state (CTS) absorption, 5Di→5Di−1 one-step and 5D→CTS→5D two-step quenchings, and CTS→5Di feeding fractions. The preferred fit requires unequal force constants and a small downshifting of the CTS parabola with increasing temperature.
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Struck et al. (1976) studied this question.
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