Coherent inelastic neutron scattering in lattice dynamics by B. Dorner

By B. Dorner

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22. For the calculated ones in Fig. 23 we had to assume eigenvectors f o r the two free molecule internal modes. Each one produces a symmetric and a antisymmetric l a t t i c e mode. The symmetry considerations are the same as in naphthalene. \ IITH= lj5 ,,o 7F>~_) 120 Z W IO0 " 0 W w LL 8o ~ # 3 2 60 . . . . z Y SYN ANTISYM v F 0 0 u . . 2 0/, A SYM Measured phonon dispersion curves f o r the 12 external and the 4 lowest in~ernal modes in anthracene at 12 K f o r d i f f e r e n t symmetry d i r e c t i o n s .

This means that the experimental error e s t i mates (as mentioned above) are larger than the deviations of the calculated curve from the measured points. Suppressing the p o l a r i s a b i l i t y of the Ag ion the 9 parameters l e f t free adapt new values - some of them considerably d i f f e r e n t as the pola+ r i s a b i l i t y of the Br ion and the quadrupole terms SFI2 on the Ag ion. These two quadrupolar terms contain the essential difference between the models applied by DORNERet a l .

1). dispersion curves of the non-transition metal Cd have been measured by DORNER (1981c). Since naturally occurring cadmium strongly absorbs neutrons (2650 this experiment has been performed with a monocrystal of the isotope llOcd. 623). This makes most of the physical properties of these metals much more complicated and p a r t i c u l a r l y interesting to study. 35 From the point of view of the modern theory of metals both elements are of i n terest because they are intermediate between simple ( s - p ) and t r a n s i t i o n metals.

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