15min:

R. S. RAM AND P. F. BERNATH, Department of Chemistry, University of York, Heslington, York YO10 5DD.

Emission spectra of the B^{2 +}--X^{2 +} transition of ¹³C¹⁴N have been observed at high resolution using the Fourier transform spectrometer associated with the McMath-Pierce Solar Telescope of the National Solar Observatory. The spectra have been measured in the 21000--30000 cm^-1 region and a total of 52 vibrational bands involving vibrational levels up to v=15 of the ground and excited states have been rotationally analyzed to provide a much improved set of spectroscopic constants. The results of the present analysis should prove useful in the identification of additional ¹³C¹⁴N lines in comets and cool stars, and will help in the determination of the ¹²C/¹³C abundance ratio.

The observation of a number of highly-excited vibrational bands of the A² --X^{2 +} transition as well as a few bands of the B^{2 +}--A² transition will also be reported.