The effect of nucleon current contribution to nucleon magnetic moment is considered up to the fourth order of the coupling constant in the cut-off meson theory using the renormalization procedure as developed by Chew. The same parameters as employed to fit the meson-nucleon scattering data have been used here. It is found that the additional contribution due to this effect improves the previous theoretical results where only the mesonic current contribution has been taken into account.

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A transformation of a Jahn-Teller Hamiltonian with multimode interactions is developed, and used to discuss Raman scattering from an impurity in a crystal. It is shown that the same transformation can account both for the sharp, low-energy features that look like scattering associated with a local mode and the broad band which is typical of impurity-assisted scattering from a spectrum of phonons. The coexistence of these two features is shown to be characteristic of strong Jahn-Teller coupling. Line widths and energies are calculated for the sharp features. The effects of stress and the proper definition and use of Ham factors in the presence of a multimode interaction are discussed.

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