Inhaltsbereich
Brillouin Interferometry
Brillouin spectroscopy is a technique that allows us to measure acoustic sound velocity in small transparent samples up to very high pressures in a diamond-anvil cell. This technique exploits Brillouin scattering, inelastic scattering by collective thermal motions in condensed materials.
Bildergalerie Brillouin-Interferometer
Our Brillouin spectroscopy system at GFZ Potsdam is designed to host large experimental setups (you can see the very large Eulerian cradle with a diamond-anvil cell).
Shear elastic anisotropy of ferropericlase (Mg0.9Fe0.1)O up to mid-lower mantle pressures (Marquardt et al., Science, 324, 224, 2009; Marquardt et al., Earth Planet. Sci. Lett., 287, 345)
Brillouin scattering laboratory in PETRA III
We have built, in collaboration with DESY HASYLAB, a new Brillouin spectroscopy system at PETRA III, the third generation synchrotron source in Hamburg. The new systems allows one to combine acoustic velocity measurements and density measurements by x-ray diffraction at the same experimental conditions at the extreme conditions beamline P02.2, next to the Brillouin scattering laboratory.
Left: spatial dispersion of acoustic velocity in a (110) plane of spinel (MgAl2O4) at high pressure in the diamond anvil cell (DAC). Center: a photo of the sample in the DAC. Right: X-ray diffraction photo of the sample in the DAC to determine its density at high pressure.
Left: spatial dispersion of acoustic velocity in a (110) plane of spinel (MgAl2O4) at high pressure in the diamond anvil cell (DAC). Center: a photo of the sample in the DAC. Right: X-ray diffraction photo of the sample in the DAC to determine its density at high pressure.
Contact persons: Sergio Speziale, Hauke Marquardt