Ra. Robinson et al., OBSERVATION OF TRANSVERSE PHONON MODES IN THE FIRST BRILLOUIN-ZONE INALUMINUM, Physica. B, Condensed matter, 241, 1997, pp. 161-163
We describe phonon dispersion measurements on a single crystal of alum
inum, using the 1280-pixel low-angle detector on PHAROS at Los Alamos.
''Forbidden'' transverse phonons are observed in the first Brillouin
zone: these are due to multiple scattering that preserves the e-depend
ence of the dispersion surface. We discuss the use of large-area detec
tors for imaging dispersion surfaces. (C) 1998 Elsevier Science B.V. A
ll rights reserved.