Abstract
An effusive pyrolysis source is described for generating a continuous beam of radicals under conditions appropriate for the helium droplet pick-up method. Rotationally resolved spectra are reported for the ν1 vibrational mode of the propargyl radical in helium droplets at 3322.15 cm−1. Stark spectra are also recorded that allow for the first experimental determination of the permanent electric dipole moment of propargyl, namely, −0.150 and −0.148 D for ground and excited states, respectively, in good agreement with previously reported ab initio results of −0.14 D. The infrared spectrum of the ν1 mode of propargyl-bromide is also reported. The future application of these methods for the production of novel radical clusters is discussed.
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