Contact :
This platform, developed in the framework of PLANEX project, based on the coupling between “transparent” Internally Heated Pressure Vessel (IHPV) and Raman spectrometer allows to perform in situ high temperature (HT) – high pressure (HP) Raman measurements. It can satisfy the following scientific objectives of the PLANEX project (points 2, 3 and 6):
- structure and dynamics of molten (alumino)silicates, salts, carbonates, etc
- nucleation and crystallisation processes
- structure and speciation of hydrothermal solutions and volatile species COHN
Principe :
The sample is placed in the sapphire container inside the Internally Heated Pressure Vessel. The Raman probe allows to focus the excitation laser line (355 nm UV or 532 nm VIS) on the sample (through a sapphire window) and to collect the back-scattered Raman signal. The optical fibre is carrying the signal to the Raman spectrometer equipped with the back-illuminated CCD detector. The Raman spectra can be recorded till 1200°C and up 2000 bar.
Technical details :
- Andor Shamrock 500i Raman spectrometer equipped with the back illuminated iDus CCD detector
- home-made (CEMHTI) Raman probe
- 355 nm (Coherent Genesis CX355-100 SLM) et 532 nm (Genesis MX533-500 SLM) lasers
The actual design of the Internally Heated Pressure Vessel, optimized due to the PLANEX founds, is based on the first model (Testemale et al., 2005 [1]) used in the Neel Institute (coll. SERAS) and the ESRF’s Fame line devoted to the XAS measurements.
The Raman platform is fully operational and open for various users and projects.
Collaboration :
[1]: D. Testemale, R. Argoud, O. Geaymond and J.-L. Hazemann, High pressure/high temperature cell for x-ray absorption and scattering techniques, Review of Scientific Instruments, 2005, 76, DOI:10.1063/1.1884188