Laser Magnetic Resonance Spectrum of NO2 at 337 μm and 311 μm

The Zeeman components of several rotational transitions of nitrogen dioxide have been observed in absorption using the 311 and 337 μm lines of an HCN laser as a source. The Zeeman components of four rotational transitions (two at 311 μm and two at 337 μm) have been assigned. Two components of the g tensor have been determined from the spectrum by least square fitting. The anisotropic component ${\mathrm{(aa)}}_g^{\mathrm{(S)}},$ obtained as −0.010, agrees well with that predicted from theory, but the isotropic component ${\text{(0)}}_g^{\mathrm{(S)}},$ obtained as 2.013, does not agree satisfactorily with theoretical prediction or with solid phase measurements both of which give 1.9997. The rotational frequencies of the four transitions have also been obtained.