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The molecular Zeeman effect has been observed in the rotational spectrum of 2-fluoropyridine at magnetic fields close to 25000 G. The measured molecular g-values are g aa  = -0.0880 ± 0.0007, g bb  = - 0.0405 ±0.0006, g cc  = + 0.0233 ±0.0006, and the two linearily independant components of the magnetic susceptibility anisotropy are 2 · χ aa  - χ bb  - χ cc  = 50.5 ± 1.6 and 2 · χ bb  - χ cc  - χ aa  - 53.8 ± 1.1 in units of 10 -6  erg/G 2  mol). The a-axis is close to the C-F-bond and the c-axis is perpendicular to the plane of the ring. A comparison of the gas-phase out-of-plane minus the average in-plane values for the susceptibilities of 2-fluoropyridine, pyridine, and fluorobenzene with the corresponding value for benzene in crystalline phase leads to the conclusion that the susceptibilities may change in the order of 10% when going from solid or liquid phase to the gasphase. A short description of the microwave-Zeeman spectrograph built at Kiel University is given. In the theoretical section expressions for the g-values and susceptibilities are derived which are more complete then those used up to now.

Der Zeemann-Effekt im Rotationsspektrum von 2-Fluoropyridin