Abstract
AbstractCoherent inelastic neutron scattering measurements of the temperature dependence of the frequency shifts and widths of some phonons in deuterated solid anthracene are presented. Calculations of the explicit anharmonic phonon frequency shift and the linewidth to the lowest order are described. It is assumed that the intermolecular potential is a pairwise sum of atom‐atom potentials. Using a 6‐exp potential, and potential parameters provided by Williams, the results for all external modes at the T point (q = 0) are calculated and compared with the available experimental data. A part of the anharmonicity of two internal modes is taken into account into the evalutaion. The results from the calculation agree with some of the measurements, but are different by about a factor of two for most of the phonons.
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