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An effusive pyrolysis source is described for generating a continuous beam ofradicals under conditions appropriate for the helium droplet pick-up method.Rotationally resolved spectra are reported for the $\nu_1$ vibrational mode ofthe propargyl radical in helium droplets at 3322.15 cm$^{-1}$. Stark spectraare also recorded that allow for the first experimental determination of thepermanent electric dipole moment of propargyl, namely -0.150 D and -0.148 D forground and excited state, respectively, in good agreement with previouslyreported ab initio results of -0.14 D [1]. The infrared spectrum of the $\nu_1$mode of propargyl-bromide is also reported. The future application of thesemethods for the production of novel radical clusters is discussed

Free radicals in superfluid liquid helium nanodroplets: A pyrolysis source for the production of propargyl radical