Experiment
Title
Vis-NIR reflectance spectra of powdered olivine, pyroxene, smectite and silica at 4 different grain sizes (from sub-µm to 200 µm) and with sub-µm grains in compact or porous surfaces
DOI
10.26302/SSHADE/EXPERIMENT_OP_20200908_001
Data reference
Sultana, Robin (2018): Vis-NIR reflectance spectra of powdered olivine, pyroxene, smectite and silica at 4 different grain sizes (from sub-µm to 200 µm) and with sub-µm grains in compact or porous surfaces. SSHADE/GhoSST (OSUG Data Center). Dataset/Spectral Data. https://doi.org/10.26302/SSHADE/EXPERIMENT_OP_20200908_001
Publications
Database(s)
Experimentalists
Type(s)
laboratory measurement
Description
We measured the reflectance spectra (from 0.5 to 4.2 µm) of powders of olivine, pyroxene, a smectite-rich material, and amorphous silica. The powders were grinded and sieved and the spectra of four size fractions were measured: 100-200 µm, 50-100 µm, 0-50 µm, and sub-micrometer sized grains. In addition, porous surfaces of the latter grains were produced by mixing them with water ice and sublimating the ice.
Number of spectra
19
Variable type(s)
  • sample composition
  • sample grain size
  • sample texture
Instrument
SHINE 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
#1 400.0 - 660.0 20.0 5.0
#2 680.0 - 1380.0 20.0 10.0
#3 1400.0 - 2980.0 20.0 20.0
#4 3000.0 - 4200.0 20.0 40.0
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°
Comments
The spectro-radio-goniometer SHINE was used in Gognito mode, as described in Potin et al. (2018, https://doi.org/10.1364/AO.57.008279), section D.2. The illumination beam was focused on an area of 6 mm in diameter on the sample, in order to increase the signal-to-noise ratio of our measurements.
Illumination
Observation
Comments
partial polarization variable with wavelength (from monochromator grating)
Observation mode
single spot
Spatial resolution
6.0 $mm$
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
#1 400.0 - 660.0 20.0 3.2
#2 680.0 - 1380.0 20.0 6.3
#3 1400.0 - 2980.0 20.0 13.0
#4 3000.0 - 4200.0 20.0 26.0
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
Spatial resolution
5.2 $mm$
Date begin - end
2018-10-09 - 2020-01-28

Versions

Release date
2020-10-06 07:47:56 UTC+0000
Version (Date)
#1 (2020-10-01 15:34:03 UTC+0000, Updated: 2020-10-06 10:41:13 UTC+0000)
Sponsors
  • European Research Council (ERC SOLARYS) (SOLARYS: Composition of Solar System Small Bodies (ERC-CoG2017-771691))