The phonon frequencies, Es, measured as the energy differences between zerophonon hole peak and pseudophonon side hole peak in photochemical hole burning (PHB) spectra, were studied for tetraphenylporphin (TPP) in epoxy resin films under various conditions of sample preparation and annealing. The values of phonon frequency, Es, reflecting low energy excitation modes of the matrix epoxy resins were about 13 to 16 cm−1. They decreased when the epoxy resin was cured at relatively low temperatures and vi…
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