title: Brillouin and Umklapp scattering in polybutadiene: comparison of neutron and x-ray scattering.
abstract: We report a comparison of high resolution inelastic x-ray Brillouin scattering to coherent inelastic neutron scattering for amorphous deuterated polybutadiene, done for one temperature in the glass phase and another one in the melt. The x-ray scattering proves to be by far the better technique for such a polymer within its present resolution bounds. The neutron scattering allows one to extend these measurements to a much better resolution, showing an additional quasielastic signal in the melt. The results suggest x-ray measurements at higher momentum transfer, to see whether they are complementary to neutrons.
authors.affiliation: Department of Polymer Science, University of Akron, Akron, Ohio 44325-3909, USA.
authors.forename: A P
authors.initials: AP
authors.lastname: Sokolov
authors.forename: U
authors.initials: U
authors.lastname: Buchenau
authors.forename: D
authors.initials: D
authors.lastname: Richter
authors.forename: C
authors.initials: C
authors.lastname: Masciovecchio
authors.forename: F
authors.initials: F
authors.lastname: Sette
authors.forename: A
authors.initials: A
authors.lastname: Mermet
authors.forename: D
authors.initials: D
authors.lastname: Fioretto
authors.forename: G
authors.initials: G
authors.lastname: Ruocco
authors.forename: L
authors.initials: L
authors.lastname: Willner
authors.forename: B
authors.initials: B
authors.lastname: Frick