Abstract
† CFCl 3 (Freon 11, ~99%, Aldrich), CF3CCl3 (Freon 113a, obtained syn thetically 5 from Freon 113, 99%, Aldrich; the main product constituted more than 99% of the mixture) were used; in certain cases, Freons were purified additionally using a standard procedure. Commercial cis and trans2,3dimethyloxiranes (97%, Aldrich) were used as received. The dimethyloxirane/Freon solutions (0.3–0.5 mol%) were inserted into quartz or SK4B glass tubes, evacuated to ~0.1 Pa and irradiated with Xrays at 77 K to doses of 2–4 kGy. A 5BHV6W Xray source (33 kV, 80 mA) was used. The EPR spectra of paramagnetic species were recorded on a Varian E3 spectrometer. The absolute error in the concentration of paramagnetic species determined by EPR was within ±20%. The EPR spectra were simulated with the use of the PEST WinSim and Simfonia 6 standard soft ware packages.
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