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The distinctive set of infrared (IR) emission bands at 3.3, 6.2, 7.7, 8.6,and 11.3{\mu}m are ubiquitously seen in a wide variety of astrophysicalenvironments. They are generally attributed to polycyclic aromatic hydrocarbon(PAH) molecules. However, not a single PAH species has yet been identified inspace, as the mid-IR vibrational bands are mostly representative of functionalgroups and thus do not allow one to fingerprint individual PAH molecules. Incontrast, the far-IR (FIR) bands are sensitive to the skeletal characteristicsof a molecule, hence they are important for chemical identification of unknownspecies.  With an aim to offer laboratory astrophysical data for the Herschel SpaceObservatory, Stratospheric Observatory for Infrared Astronomy, and similarfuture space missions, in this work we report neutral and cation FIRspectroscopy of pentacene (C_22H_14), a five-ring PAH molecule. We report threeIR active modes of cationic pentacene at 53.3, 84.8, and 266{\mu}m that may bedetectable by space missions such as the SAFARI instrument on board SPICA.  In the experiment, pentacene is vaporized from a laser desorption source andcooled by a supersonic argon beam. We have obtained results from two-colorresonantly enhanced multiphoton ionization and two-color zero kinetic energyphotoelectron (ZEKE) spectroscopy. Several skeletal vibrational modes of thefirst electronically excited state of the neutral species and those of thecation are assigned, with the aid of ab initio and density functionalcalculations.

astrophysical journal/the astrophysical journal

Far-Infrared Spectroscopy of Cationic Polycyclic Aromatic Hydrocarbons:  Zero Kinetic Energy Photoelectron Spectroscopy of Pentacene Vaporized from  Laser Desorption