Intensity of the Forbidden X Π322 — X 2Π½ Satellite Bands in the Infrared Spectrum of Nitric Oxide

Satellite lines in the spectrum of nitric oxide which correspond to transitions ${}^2{\Pi }_{\frac{3}{2}}$ , v=1, J′←²Π_½, v=0, J were observed. Intensity measurements show that these lines are of the order of 10^—4 times less intense than the fundamental and have intensities which agree with theoretical predictions. From line‐frequency measurements the multiplet splitting parameter is obtained for both the v=0 and v=1 vibrational levels. The values obtained are A₀=123.1 cm^—1 and A₁=122.9 cm^—1. The intensity of the fundamental is found to be 138 cm^—2/atm at 273°K, which corresponds to a dipole moment derivative of 2.32 D/Å.