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 quart z 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 t o J = 62 were observed as well as vibrational levels up to v(2) = 5. Now al l the quadratic contributions to the vibrational and rotational term values have been determined, as well as some higher order terms. (C) 2001 Academi c Press.