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Title: Single-crystal Brillouin spectroscopy with CO{sub 2} laser heating and variable q

We describe a Brillouin spectroscopy system integrated with CO{sub 2} 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 ± 150 K at high pressure. Single-crystal laser-heating Brillouin measurements were made on the (111) plane of San Carlos olivine at ∼13 GPa, 1300 ± 200 K. The pressure as measured by ruby fluorescence is shown to be within ±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 0° scattering angle) up to near back scattering (∼141°). 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)
Authors:
;  [1] ;  [2]
  1. Department of Geology, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801 (United States)
  2. Materials Research Department, Toyota Research Institute of North America, Ann Arbor, Michigan 48105 (United States)
Publication Date:
OSTI Identifier:
22482688
Resource Type:
Journal Article
Resource Relation:
Journal Name: Review of Scientific Instruments; Journal Volume: 86; Journal Issue: 6; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; BACKSCATTERING; BRILLOUIN EFFECT; CARBON DIOXIDE LASERS; FLUORESCENCE; LASER-RADIATION HEATING; MONOCRYSTALS; OLIVINE; POTASSIUM BROMIDES; PRESSURE RANGE GIGA PA; SPECTROSCOPY; TEMPERATURE RANGE 1000-4000 K; THERMAL RADIATION; TUNGSTEN