The Far-Infrared Spectrum of ClNO 2Studied by High-Resolution Fourier-Transform Spectroscopy

The far-infrared spectrum of nitryl chloride was studied using high-resolution Fourier-transform spectroscopy in the 300-525 cm^-1region. Vibrational band centers of fundamental, hot, and difference bands were determined. Furthermore, rotational and centrifugal distortion constants up to fourth order for the ν₃bands of³⁵ClNO₂and³⁷ClNO₂(centered at 370 and 364 cm^-1, respectively) were obtained. The ν₅fundamental of ClNO₂(predicted around 410 cm^-1) is very weak and overlapped by difference bands.