Radiation of an extrinsic crystal under conditions of a order–disorder phase transition
V. S. GorobchenkoB. I. Verkin Physicotechnical Institute of Low Temperatures, Academy of Sciences, 310164, Khar’kov, pr. lenina, 47V. V. EremenkoB. I. Verkin Physicotechnical Institute of Low Temperatures, Academy of Sciences, 310164, Khar’kov, pr. lenina, 47L. A. OgurtsovaB. I. Verkin Physicotechnical Institute of Low Temperatures, Academy of Sciences, 310164, Khar’kov, pr. lenina, 47O. S. PyshkinB. I. Verkin Physicotechnical Institute of Low Temperatures, Academy of Sciences, 310164, Khar’kov, pr. lenina, 47
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Аннотация
The fine-structure stimulated-emission spectra of a paraterphenyl crystal with naphthalene impurity was investigated in the temperature interval 5−10 K. Anomalous behavior of the stimulated-emission lines was observed in the temperature range 15−25 K and is tentatively attributed to the presence of a phase transition, close to a phase transition of the order–disorder type, in the matrix at a temperature of ≃19 K.
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