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The first optical spectrum of an isolated polycyclic aromatic hydrocarbonlarge enough to survive the photophysical conditions of the interstellar mediumis reported. Vibronic bands of the first electronic transition of the allbenzenoid polycyclic aromatic hydrocarbon hexa-peri-hexabenzocoronene wereobserved in the 4080-4530 Angstrom range by resonant 2-color 2-photonionization spectroscopy. The strongest feature at 4264 Angstrom is estimated tohave an oscillator strength of f=1.4x10^-3, placing an upper limit on theinterstellar abundance of this polycyclic aromatic hydrocarbon at 4x10^12cm^-2, accounting for a maximum of ~0.02% of interstellar carbon. This studyopens up the possibility to rigorously test neutral polycyclic aromatichydrocarbons as carriers of the diffuse interstellar bands in the near future.

The optical spectrum of a large isolated polycyclic aromatic hydrocarbon: hexa-peri-hexabenzocoronene, C42H18