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Photochemical hole burning (PHB) of free-base tetraphenylporphin (TPP) in epoxy resin was performed at 4.2–80 K. Effect of crosslinked structure of the epoxy resin on the dephasing time T2, low-energy excitation modes, and the temperature dependence of Debye–Waller factor were studied through the PHB measurements. The excellent thermal stability of TPP in epoxy resin including the hole burning above liquid-nitrogen temperature (80 K) was demonstrated.
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Furusawa et al. (1990) studied this question.
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