Anharmonicity of phonons in crystalline naphthalene

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Abstract
Neutron inelastic scattering experiments have been carried out to measure the phonon energies of deuterated naphthalene C10D8 for the lowest 12 dispersion branches along ( xi 00) and (00 xi ) directions at various temperatures ranging from 6 to 300K. Using measured mode Gruneisen parameters the quasiharmonic shifts related to the deformation of the lattice and to the temperature-dependent anharmonic self-energy shift were obtained separately. For calculations the authors used the rigid molecule model based on the '6-exp' potential.