| Abstract
| - Jet-cooled terrylene has been studied in helium buffer gas using a pulsed nozzle by means of laser-inducedfluorescence. Fluorescence excitation and two-color depletion experiments (resulting in hole burning spectra)are presented. Analysis of the spectra leads to the conclusion that another excited electronic state is presentin the vicinity of the allowed 1B1u state. Assuming (according to previous literature suggestions Karabunarliev,S.; Baumgarten, M.; Müllen, K. J. Phys. Chem. A 1998, 102, 7029) that this dark state is the 2Ag state, wediscuss the vibrational structure of the fluorescence excitation spectrum in terms of two manifolds of vibronicstates belonging to Sd(21Ag) and S1(1B1u) states. The anomalous shift between excitation and dispersedfluorescence spectra observed earlier for terrylene in a neon matrix is discussed as a consequence of terryleneelectronic relaxation to the low-energy dark state.
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