S. Ohkoshi et al., A TIME-RESOLVED ELECTRON-NUCLEAR DOUBLE-RESONANCE (ENDOR) STUDY OF THE PHOTO-EXCITED TRIPLET-STATE, Chemical physics letters, 224(3-4), 1994, pp. 313-318
A time-resolved ENDOR (TRENDOR) apparatus was constructed and applied
to observe hyperfine couplings in the photoexcited triplet (T1) state.
The TRENDOR spectra of the T1 states were observed both in mixed crys
tals and glass. The hyperfine coupling constants were obtained at 4-10
0 K for quinoxaline in single crystals of durene and p-dibromobenzene
and for tetraphenylporphine (H2TPP) in toluene glass. The time profile
of the ENDOR signal was analyzed with population kinetics using a fou
r-level system.