urn:nasa:pds:context:instrument:psl.bruker-vertex80v 1.0 1.16.0.0 Product_Context 2023-08-28 1.0 Initial version. urn:nasa:pds:context:facility:laboratory.psl instrument_to_facility Bruker VERTEX 80v Spectrometer UV-VIS-VNIR-MIR Bruker VERTEX 80v FTIR spectrometers https://www.bruker.com/en/products-and-solutions/infrared-and-raman/ft-ir-research-spectrometers/vertex-research-ft-ir-spectrometer/vertex-80-80v-ft-ir-spectrometer.html Reflectance measurements were acquired with a Bruker Vertex80V FTIR spectrometer with a Bruker A513 unit that enabled bidirectional reflectance measurements. The instrument was under vacuum at a pressure of 0.7 mbar and all measurements were done at ambient temperature. The incidence, emission, and phase angles were 30º, 0º, and 30º, respectively. The measurements were acquired over the total spectral range of 0.2 to 25 um. The MIR (which actually extends shortward into the NIR) covers the spectral range from 1.0 to 20 um. The samples were measured, through a 0.25 mm aperture, using a spectrometer housing a mercury-cadmium-telluride (MCT) detector and a KBr beamsplitter. The samples were illuminated with an external, water-cooled Globar. The output "MIR" reflectance spectrum was an average of 500 scans (at 2 cm-1 spectral sampling) calibrated to an Infragold diffuse reflectance target.