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• W2003756900 abstract "Abstract The low lying singlet and triplet states of high purity single crystals of hexachlorobenzene are investigated. The fluorescence quantum yield is 10−2 The polarized fluorescence spectrum at 4.2°K is analyzed as pure exciton emission. There is no evidence for emission from trap levels. The electronic origin for the first singlet transition is at 32736 cm−1. The phosphorescence quantum yield is 10−2. The triplet exciton emission origin is at 25685 cm−1 which coincides with the direct triplet exciton absorption origin in contrast to other reports. The crystal phosphorescence is very sensitive to crystal temperature between 4.2 and 15°K. At 4.2°K the emission origins is 39 cm−1 below the triplet exciton band. Emission from the triplet exciton band is observed when the crystal temperature is above 4.2°K. The spectrum is interpreted in terms of a low lying trap level due presumably to impurity induced displacement of the triplet energy level of some hexachlorobenzene molecules and a deep lying trap (1345 cm−1) which at high temperatures acts as the main emitting centre. The polarozed S0 T1 and S0 T2 absorption spectra are observed. the second triplet exciton origin is at 32240 cm−1. The pressence of in-plane intensity in the S0 T1 absorption spectrum suggests that the molecular symmetry is not D64 in the triplet state." @default.
• W2003756900 created "2016-06-24" @default.
• W2003756900 creator A5003495405 @default.
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• W2003756900 date "1970-05-01" @default.
• W2003756900 modified "2023-10-02" @default.
• W2003756900 title "Absorption, Fluorescence and Phosphorescence Spectra of Hexachlorobenzene Single Crystals at 4.2°K" @default.
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• W2003756900 doi "https://doi.org/10.1080/15421407008083494" @default.
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