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In this work, we study the photodissociation processes of small PAH clusters(e.g., pyrene clusters). The experiments are carried out using a quadrupole iontrap in combination with time-of-flight (QIT-TOF) mass spectrometry. Theresults show that pyrene clusters are converted into larger PAHs under theinfluence of a strong radiation field. Specifically, pyrene dimer cations(e.g., [C$_{16}$H$_{10}$$-$C$_{16}$H$_{9}$]$^+$ or C$_{32}$H$_{19}$$^+$), willphoto-dehydrogenate and photo-isomerize to fully aromatic cations (PAHs) (e.g.,C$_{32}$H$_{16}$$^+$) with laser irradiation. The structure of new formed PAHsand the dissociation energy for these reaction pathways are investigated withquantum chemical calculations. These studies provide a novel efficientevolution routes for the formation of large PAHs in the interstellar medium(ISM) in a bottom-up process that will counteract the top-down conversion oflarge PAHs into rings and chains, and provide a reservoir of large PAHs thatcan be converted into C$_{60}$ and other fullerenes and large carbon cages.

Laboratory photo-chemistry of pyrene clusters: an efficient way to form large PAHs