Abstract
Polycyclic aromatic hydrocarbons (PAHs) are believed to be responsible for the Diffuse Interstellar Bands (DIBs), a set of absorption bands observed in Interstellar Space. To provide further information on this issue, we have started a series of experiments devoted to the electronic spectroscopy of some neutral PAH molecules. In order to overcome the difficulty in achieving densities high enough for spectroscopic studies, we have embedded the PAHs in liquid helium droplets which are considered to represent an ideal nanomatrix with very small interaction between the trapped molecule and host. Here we report on first results obtained for the two molecules anthracene (C14H10) and tetracene (C18H12). Using both laser‐induced fluorescence (LIF) and molecular beam depletion (MBD) spectroscopy, we have characterized the first electronic transition (S1 ← S0) of these species when they are solvated in liquid helium clusters.
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