High-Temperature Infrared Emission Measurements on HNC

The emission spectrum of HNC has been measured from 400 to 4100 cm−1. The HNC was observed as an equilibrium mixture of HCN and HNC in a fused quartz cell heated to 1370 K. The three fundamental bands and many hot bands of HNC were measured with resolutions ranging from 0.006 cm−1 for the lowest fundamental to 0.033 cm−1 for the other two. High rotational levels up to J=62 were observed as well as vibrational levels up to v2=5. Now all the quadratic contributions to the vibrational and rotational term values have been determined, as well as some higher order terms.