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The Raman spectrum of phenyl radical (C 6 H 5 ) isolated in low-temperature argon matrices has been obtained. The assignments of experimentally observed frequencies are based on comparison with results of quantum chemical calculations (B3LYP/cc-pVTZ) and with infrared absorption bands measured for 12 C 6 H 5 and 13 C 6 H 5 species. Analysis of the IR and Raman spectra, including IR linear dichroism, and of the isotopic shifts caused by 12 C → 13 C substitution allows to reconfirm most of the previous assignments and to introduce some corrections. The prominent ring breathing mode, characteristic for benzenoid compounds (991 cm -1 in benzene), occurs in phenyl radical at 998 cm -1 .
Łapiński et al. (Sat,) studied this question.