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Many P- and R-branch lines of the fundamental bands of the 12 C 14 N and 13 C 14 N radicals in their ground ( 2 Σ + ) electronic state have been measured at high resolution by diode laser absorption spectroscopy. The radicals were generated in a 2.45 GHz planar microwave plasma in methane with varying proportions of N 2 and H 2 . From a fit to the spectra the origins of the fundamental bands of the two isotopomers were determined to be 2042.421 04(84) cm -1 and 2000.084 70(30) cm -1 . The main product detected in the plasma by diode laser spectroscopy is HCN, with concentrations about three orders of magnitude higher than CN. [ABSTRACT FROM AUTHOR]