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Anharmonic Phonon Frequency Shifts and Widths in Solid Deuterated Anthracene‐d 10
Author(s) -
Jordan J. F. J.,
Kalus J.,
Schmelzer U.,
Eckold G.
Publication year - 1989
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2221550107
Subject(s) - anharmonicity , phonon , anthracene , deuterium , inelastic neutron scattering , laser linewidth , atom (system on chip) , physics , atomic physics , chemistry , condensed matter physics , scattering , neutron scattering , quantum mechanics , laser , computer science , embedded system
Coherent 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.