The differential magnetizability and the Cotton—Mouton effect of gases

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Abstract
The effect of the interaction of the magnetic field associated with a propagating wave with an atomic or molecular system in a static magnetic field is investigated. This leads, in the case of molecules, to small contributions to the magnetic field induced birefringence (Cotton—Mouton effect). These are not entirely negligible also in view of the increasing sophistication of experimental equipment. Test calculations on a few linear molecules (H2, N2, C2H2 and HF) show that the extra terms, which were neglected in previous analyses, contribute in the range of a few ppm to the induced birefringence. For the systems under study, this is in principle within the sensitivity of current experimental techniques.

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