C-13 ISOTOPE EFFECTS FOR PENTACENE IN P-TERPHENYL - HIGH-RESOLUTION SPECTROSCOPY AND SINGLE-SPIN DETECTION

Weak satellites in S-1<--S-0 excitation spectra of natural-abundance p entacene in p-terphenyl due to position-specific C-13 isotope shifts w ere observed. An assignment of these satellites to the various carbon positions is derived. The extremely narrow inhomogeneous linewidth all owed selective excitation of pentacene molecules with C-13 in specific positions. Spectra of the magnetic-resonance transition between tripl et sublevels of such ensembles, and of individual pentacene molecules showed position-specific C-13 hyperfine broadening. (C) 1996 American Institute of Physics.