Single-crystal Brillouin spectroscopy with CO2 laser heating and variable q
At a Glance
Section titled āAt a Glanceā| Metadata | Details |
|---|---|
| Publication Date | 2015-06-01 |
| Journal | Review of Scientific Instruments |
| Authors | Jin S. Zhang, Jay D. Bass, Gaohua Zhu |
| Institutions | Toyota Research Institute, University of Illinois Urbana-Champaign |
| Citations | 24 |
Abstract
Section titled āAbstractāWe describe a Brillouin spectroscopy system integrated with CO2 laser-heating and Raman spectroscopic capabilities. Temperature is determined by measurements of the grey-body thermal radiation emitted by the hot sample, with the system response calibrated relative to a standard tungsten ribbon lamp. High-pressure laser-heating Brillouin scattering measurements of acoustic velocities on liquid water and ice compressed in a diamond-anvil cell were performed at temperatures up to 2500 Ā± 150 K at high pressure. Single-crystal laser-heating Brillouin measurements were made on the (111) plane of San Carlos olivine at ā¼13 GPa, 1300 Ā± 200 K. The pressure as measured by ruby fluorescence is shown to be within Ā±0.5 GPa of the pressure on the olivine sample during laser heating when KCl and KBr are used as pressure-transmitting media. In addition, the system is designed for continuously variable scattering angles from forward scattering (near 0Ā° scattering angle) up to near back scattering (ā¼141Ā°). This novel setup allows us to probe a wide range of wave vectors q for investigation of phonon dispersion on, for example, crystals with large unit cells (on the scale of hundreds of nm).
Tech Support
Section titled āTech SupportāOriginal Source
Section titled āOriginal SourceāReferences
Section titled āReferencesā- 2007 - Treatise of Geophysics