Temperature-dependent elastic constants of thorium dioxide probed using time-domain Brillouin scattering

Rayleigh-Brillouin scattering of carbon dioxide.

The spectral line shape of spontaneous Rayleigh-Brillouin scattering in CO2 is studied in a range of pressures. The spectrum is influenced by the bulk viscosity η(b), which is a relaxation phenomenon involving the internal degrees of freedom of the molecule. The associated relaxation rates can be compared to the frequency shift of the scattered light, which demands precise measurements of the s...

Brillouin-scattering study of the elastic constants of phenothiazine through the phase transition.

Comment on "Brillouin-scattering study of the elastic constants of phenothiazine through the phase transition"

The elastic constants and related properties of beta-HMX determined by Brillouin scattering.

By scattering from a variety of acoustic phonons, a complete stiffness tensor has been determined for crystalline beta-HMX. The results are compared with recent experimental and theoretical determinations of the elastic constants and bulk modulus. Reasons for disagreement are discussed in terms of experimental limitations and anharmonic effects. The observed ordering of stiffness constants, C(1...

Elastic constants of tetrahedral amorphous carbon films by surface Brillouin scattering

The elastic constants of tetrahedral amorphous carbon ~ta-C! and hydrogenated tetrahedral amorphous carbon ~ta-C:H! thin films were determined nondestructively by surface Brillouin scattering. Besides the usual Rayleigh surface mode, we also observe a new pseudosurface acoustic mode of longitudinal polarization, which is a modified version of the longitudinal guided mode usually found in slow-o...