Spectrum

VIS-NIR-MIR reflectance spectrum of Iron sulfides powder (sub-µm grains)

Title
VIS-NIR-MIR reflectance spectrum of Iron sulfides powder (sub-µm grains)
DOI
10.26302/SSHADE/EXPERIMENT_OP_20230207_001
Data reference
Sultana, Robin (2019): VIS-NIR-MIR Reflectance spectra of mixtures of sub-µm grains of Olivine with Iron Sulfides or Anthracite, at different concentrations. SSHADE/GhoSST (OSUG Data Center). Dataset/Spectral Data. https://doi.org/10.26302/SSHADE/EXPERIMENT_OP_20230207_001
Publications
Database
Experimentalists
Experiment type
laboratory measurement
Type
reflectance factor
Instrument
Brucker Vertex 70 – transmission Mid-IR
Sample holder
Aluminum sample holder in a biconical reflectance kit A513/QA
Standard medium
air
Observation mode
spectrum
Spectral range type(s)
NIR, MIR
Valid spectral range(s)
Min - Max ($nm$) Sampling ($nm$) Resolution ($nm$) Position accuracy ($nm$) Absorption edge
#1 2222.0 - 25000.0
Observation geometry
biconical
Observation mode
fixed angles
Incidence angle
15.0°
Emergence angle
30.0°
Azimuth angle
0.0°
Phase angle
45.0°
Resolution observation
5.0°
Illumination
Observation
Comments
some wavelength dependent polarization
Observation mode
single spot
Resolutions
5.0 ${\pm}$ 1.0 $mm$
Instrument
SHADOWS Spectro-Gonio bidirectional reflection Vis-NIR
Standard medium
vacuum
Observation mode
spectrum
Spectral range type(s)
Vis, NIR
Valid spectral range(s)
Min - Max ($nm$) Sampling ($nm$) Resolution ($nm$) Position accuracy ($nm$) Absorption edge
#1 500.0 - 660.0 20.0 3.8
#2 680.0 - 1380.0 20.0 7.6
#3 1400.0 - 2980.0 20.0 15.0
#4 3000.0 - 4200.0 20.0 31.0
Filters
Type Center/Edge ($nm$) Width ($nm$) Place
#1 long-pass filters of the spectro-gonio radiometer
Observation geometry
bidirectional
Observation mode
fixed angles
Incidence angle
0.0°
Emergence angle
30.0°
Azimuth angle
0.0°
Phase angle
30.0°
Resolution observation
4.1°
Illumination
Observation
Comments
partial polarization variable with wavelength (from monochromator grating)
Observation mode
single spot
Resolutions
5.2 $mm$
Experiment
VIS-NIR-MIR Reflectance spectra of mixtures of sub-µm grains of Olivine with Iron Sulfides or Anthracite, at different concentrations
Date begin
2019-01-01
Release date
2023-02-07 21:19:37 UTC+0000
Version (Date)
#1 (2023-02-07 21:19:37 UTC+0000, Updated: 2023-02-08 09:35:47 UTC+0000)
History
Date Mode Version Status Comments
2023-02-07 20:33:38 UTC+0000 first import #1 valid version
Analysis
From 500 nm to 2500/4000 nm the spectra were measured with the SHADOWS spectro-gonio-radiometer. Data calibration: raw bidirectional reflectance spectrum calibrated: 1) with "Spectralon 99%" measured under same geometry using its absolute BRDF (0.50-1.10µm) and 2) with "Infragold" using its relative spectral reflectance (1.10-4.18µm). From 2500/4000 nm to 25 nm, the spectra were measured with a reflectance kit on a FTIR spectrometer. Data calibration: raw biconical reflectance spectrum calibrated in relative reflectance with "matte gold plate" measured under same geometry assuming flat spectral reflectance over the whole 7500-540 cm-1 range. Residual water vapor lines (between 1750-1400, 3900-3550, 5500-5200 cm-1) and CO2 vapor lines (around 630-700 and 2360-2300 cm-1) can be observed. The portion of the spectra measured with the FTIR spectrometer was scaled to match the reflectance factor measured with SHADOWS at a wavelength in the range 2500-4000 nm, variable depending on the spectrum.
Quality flag
4
Validator(s)