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After decades of speculation and searching, astronomers have recentlyidentified specific Polycyclic Aromatic Hydrocarbons (PAHs) in space.Remarkably, the observed abundance of cyanonaphthalene (CNN, C10H7CN) in theTaurus Molecular Cloud (TMC-1) is six orders of magnitude higher than expectedfrom astrophysical modeling. Here, we report absolute unimolecular dissociationand radiative cooling rate coefficients of the 1-CNN isomer in its cationicform. These results are based on measurements of the time-dependent neutralproduct emission rate and Kinetic Energy Release distributions produced from anensemble of internally excited 1-CNN + studied in an environment similar tothat in interstellar clouds. We find that Recurrent Fluorescence - radiativerelaxation via thermally populated electronic excited states - efficientlystabilizes 1-CNN+ , owing to a large enhancement of the electronic transitionprobability by vibronic coupling. Our results help explain the anomalousabundance of CNN in TMC-1 and challenge the widely accepted picture of rapiddestruction of small PAHs in space.

Resilience of small PAHs in interstellar clouds: Efficient stabilization of cyanonaphthalene by fast radiative cooling