Isolated ultracold porphyrins in supersonic expansions. II. Zn-tetrabenzoporphyrin

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Abstract
Laser-induced fluorescence excitation spectra of zinc tetrabenzoporphyrin in seeded, pulsed, supersonic expansions of He reveal well-resolved vibrational excitations for the S0→S1 and S0→S2 electronic transitions. Electronic relaxation in the S1 manifold was interrogated by time-resolved spectroscopy, exhibiting a practical independence of the lifetimes on the excess vibrational energies in the range Ev=0–10 000 cm−1. Spectroscopic line broadening data provided semiquantitative information on interstate electronic relaxation from the electronic origin of the S2 state, whose lifetime is τ(S2)≳4 ps.