Contact :
This platform, developed in the framework of PLANEX project, based on the coupling between “transparent” Internally Heated Pressure Vessel (IHPV) and the Fourier transform infrared spectrometer allows to perform in situ high temperature (HT) – high pressure (HP) Infrared emission measurements. It can satisfy the following scientific objectives of the PLANEX project (points 2, 3, 4 and 6) :
- high pressure radiative properties of gas, liquids and solid-state samples (molten (alumino)silicates, salts, carbonates, volcanic rocks, etc.)
- structure and speciation of hydrothermal solutions and volatile species COHN
Principe :
The sample, placed inside the Internally Heated Pressure Vessel, is heated (up to 1200°C) under high pressure (up to 2000 bar). The heated sample becomes then the source of Infrared Radiation. The emitted radiation is collected (through a transparent window) and analysed by a Fourier transform infrared spectrometer. The spectral emissivity of the sample (its capacity to emit heat radiation) is determined by the so-called direct method, i.e. the ratio between the spectral radiance of the sample and that of the reference blackbody.
Technical details :
Bruker Vertex 70v FTIR spectrometer is working in a wide spectral range (50-6000 cm-1) and is equipped with the “MIR FIR” beam splitter and DLaTGS/diamond detector.
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 IR-emission platform is actually under the last step of development devoted to the tests and optimization.
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