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| Authors: | S.L. Chaplot G.S. Pawley E.L. Bokhenkov E.F. Sheka B. Dorner J. Kalus V.K. Jindal I. Natkaniec |
| Affiliation: | Physics Department, Edinburgh University, King''s Buildings, EH9 3JZ, UK;Academy of Sciences of the USSR, Chemogolovka 142432, USSR;Institut Laue-Langevin, 156X, 38042 Grenoble Cedex, France;Physikalisches Institut, Universität Bayreuth, D-8580 Bayreuth, GDR;Joint lnstitute for Nuclear Research, 141-980 Dubna, USSR |
| Abstract: | Coherent neutron inelastic scattering intensifies for two low-frequency Γ4 internal modes in anthracene-d10 have been measured at several different Brillouin zone centres. These intensifies have been used to determine the eigenvectors of the two modes involved. It is shown that the motion in both cases is a combination of a butterfly motion (B) and a twisting motion (T). The energy proportions in these two modes are 0.97B and 0.03T (±0.01) for the mode at 3.16 THz and 0.94T and 0.06B (±0.04) for the mode at 4.60 THz. This experimental result strengthens our reliance on model calculations for the assignment of phonon frequencies measured by neutron coherent inelastic scattering. |
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