A Fourier transform infrared study of the D and 13C substituted C2H3 vinyl radical in solid argon

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Abstract
A Fourier transform infrared (FTIR) isotopic matrix study of the C2H3 vinyl radical produced by the vacuum UV photolysis of ethylene has been carried out in the midinfrared from 250 to 4800 cm−1. A variety of carbon-13 and deuterium substituted ethylene parent molecules were used to form various isotopomers of C2H3. On the basis of its isotopic behavior and by comparison with Dupuis and Wendoloski’s GVB ab initio calculations, an absorption at 900 cm−1 has been assigned to the ν7, out-of-plane bending mode of C2H3. The following values for ν7 have been obtained for vinyl isotopomers: 887 cm−1 for 12CH2=12CD; 797 cm−1 for 12CD2=12CH; 704 cm−1 for 12CD2=12CD; 889 cm−1 for 13CH2=12CH; 895 cm−1 for 12CH2=13CH; and 894 cm−1 for 13CH2=13CH.