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An experimental system employing a cryopump has been assembled for high-resolution FTIR spectroscopy of species cooled in a supersonic jet expansion. Coupled to a Bruker IFS 120HR interferometer, it involves an external sample chamber and transfer optics allowing 11 optical passes of the infrared beam. Tests with CO and N20 indicate rotational temperatures in the range 6-30 K. By heating t h e nozzle, significant population of vibrational states can be achieved without sacrificing rotational cooling. The mid-infrared spectrum of Freon-12, CC12F2, has been recorded and the v8 C-type band at 1161 cm-' analysed. Rotational constants for C3%12F2 and C37C135CIF, have been calculated and the rotational temperature estimated at 40 K.

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