Knowledge Bank

The Zeeman components of several rotational transitions of nitrogen dioxide have been observed in absorption using the 311 and 337 $\mu m$ lines of an HCN laser as a source. The Zeeman components of four rotational transitions (two at 311 $\mu m$ and two at 337 $\mu $m) have been assigned. Two components of the g tensor have been determined from the spectrum by least squares fitting. The anisotropic component, $(aa)g(S)$, obtained as - 0.010 agrees well with that predicted from theory, but the isotropic component, $(O)g(S)$, obtained as 2.011 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. This work was supported by Grant C-071 of the Robert A. Welch Foundation and National Science Foundation Grant GP6305X.