Inelastic-neutron-scattering measurements of 43 mode Gr\"uneisen parameters for the [00ξ], [ξξ0], and [ξξξ] directions of RbI are reported. These "mode γ's" were determined to an accuracy of 2 to 10% of the Gr\"uneisen-parameter range (about -2 to +3). Comparison is made and good agreement is found with the results obtained using a breathing shell model which was extended to include the third-order anharmonic interactions. The third-order parameters including those due to electronic polarization effects are determined.
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Blaschko et al. (1975) studied this question.
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