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The low temperature reaction between CN and benzene (C$_6$H$_6$) is ofsignificant interest in the astrochemical community due to the recent detectionof benzonitrile, the first aromatic molecule identified in the interstellarmedium (ISM) using radio astronomy. Benzonitrile is suggested to be a lowtemperature proxy for benzene, one of the simplest aromatic molecules, whichmay be a precursor to polycyclic aromatic hydrocarbons (PAHs). In order toassess the robustness of benzonitrile as a proxy for benzene, low temperaturekinetics measurements are required to confirm whether the reaction remainsrapid at the low gas temperatures found in cold dense clouds. Here, we studythe C$_6$H$_6$ + CN reaction in the temperature range 15--295 K, using thewell-established CRESU technique (a French acronym standing for ReactionKinetics in Uniform Supersonic Flow) combined with Pulsed LaserPhotolysis-Laser-Induced Fluorescence (PLP-LIF). We obtain rate coefficients,$k(T)$, in the range (3.6--5.4) $\times$ 10$^{-10}$ cm$^3$ s$^{-1}$ with noobvious temperature dependence between 15--295 K, confirming that the CN +C$_6$H$_6$ reaction remains rapid at temperatures relevant to the cold ISM.

Benzonitrile as a proxy for benzene in the cold ISM: low temperature rate coefficients for CN + C$_6$H$_6$