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This paper deals with our on-going work on the electronic spectroscopy of tetrapyrrole molecules\udembedded in cryogenic hosts. Under nanosecond laser excitation of free-base tetrabenzoporphin\udmolecules in a nitrogen matrix at 8K, increasing laser pulse energy results in essential enhancement\udof the intensity of one or several vibronic emission lines in the fine-structure fluorescence spectrum.\udSome characteristics of stimulated radiation are realized in the observed intense monochromatic\udradiation as a result of a transition from the purely electronic S1 level to a vibrational sublevel of\udthe S0 state, corresponding to the excitation of C–C stretching vibrations of tetrapyrrole methane\udbridges. We also report on persistent spectral hole-burning effects. Hole and antihole formation\udanalysis gives some insight on the photochemical properties of tetrabenzoporphin in a nitrogen\udmatrix

Electronic spectroscopy, stimulated emission, and persistent spectral hole burning of cryogenic nitrogen matrices doped with tetrabenzoporphin