15min:

R. S. RAM, Department of Chemistry, University of York, Heslington, York, YO10 5DD, UK; Department of Chemistry, University of Arizona, Tucson, AZ 85721, USA; AND P. F. BERNATH, Department of Chemistry and Biochemistry, Old Dominion University, Norfolk, VA 23529 USA; Department of Chemistry, University of York, Heslington, York, YO10 5DD, UK.

High resolution emission spectra of the A² --X^{2 +} transition of ¹³C¹⁴N have been measured in the 15000--24000 cm^-1 region. Molecules were produced by the reaction of ¹³CH₄ and ¹⁴N₂ in an active nitrogen afterglow discharge. The spectra were recorded using the Fourier transform spectrometer associated with the McMath-Pierce Solar Telescope of the National Solar Observatory. A rotational analysis of 27 bands involving the excited state vibrational levels v' = 9--22 and the ground state vibrational levels up to v'' = 12 has been obtained. A much improved set of spectroscopic constants have been determined for the v = 0--22 vibrational levels of the A² state by combining the present measurements with those reported previously for the v = 0--8 vibrational levels of the A² state and existing infrared and millimeter-wave measurements of ¹³C¹⁴N. The 6--3, 7--4, 8--5 and 9--6 bands of the B^{2 +}--A² transition were also identified in the 23300--24000 cm^-1 region and were included in the final analysis. An experimental line list and calculated term values are provided.