The use of London's gauge-invariant orbitals in the calculation of magnetic rotational strengths is investigated. Self-consistent molecular orbitals at non-zero magnetic field strengths have been determined in the Pariser-Parr-Pople model and these have been employed in the calculation of excitation energies and transition moments according to the mono-excited configuration interaction and the random phase approximations. Applications to the magneto-optical activity of aniline, phenol, and benzonitrile are reported. The results are origin-independent and compare well with experimental values.
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Seamans et al. (1972) studied this question.
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