A time-resolved Electron Nuclear Double Resonance(ENDOR) study of the photoexcited triplet state of free-base tetraphenylporphyrin

A time-resolved Electron Nuclear Double Resonance (ENDOR) study has been made of the photo-excited triplet state of free-base tetraphenylporphyrin in a partially aligned sample with crystalline toluene as the host matrix. This has permitted measurement of the Azz hyperfine tensor elements for each of the different groups of equivalent protons in the reference frame of the zero-field splitting tensor