Spectrum

Vis-NIR bidirectional reflection spectrum of ammonium sulfate (23 wt%) mixed with pyrrhotite sub-micrometer size grains in a sublimate residue at 173 K

Title
Vis-NIR bidirectional reflection spectrum of ammonium sulfate (23 wt%) mixed with pyrrhotite sub-micrometer size grains in a sublimate residue at 173 K
DOI
10.26302/SSHADE/EXPERIMENT_OP_20191119_001
Data reference
Poch, Olivier; Istiqomah, Istiqomah (2018): Vis-NIR bidirectional reflection spectra of several ammonium salts mixed with pyrrhotite grains in sublimate residues at 173 K. SSHADE/GhoSST (OSUG Data Center). Dataset/Spectral Data. https://doi.org/10.26302/SSHADE/EXPERIMENT_OP_20191119_001
Publications
Experiment type
laboratory measurement
Type
reflectance factor
Comments
This spectrum is the average of 15 individual spectra. At 1.3-1.5 µm, 1.8-2.0 µm and 2.4-3.0 µm, the spectrum is affected by residual measurement artifacts due to the presence of water vapor in the optical path.
Instrument
SHINE Spectro-Gonio bidirectional reflection Vis-NIR
Sample holder
Aluminum sample holder, cylindrical 48 mm diameter and 5 mm depth closed by a sapphire window and cooled by a He cryostat in a vacuum chamber (Carbo-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
#1 700.0 - 1380.0 20.0 10.0
#2 1400.0 - 2980.0 20.0 19.0
#3 3000.0 - 4160.0 20.0 39.0
Filters
Type Center/Edge ($nm$) Width ($nm$) Place
#1 long-pass filters of the spectro-gonio radiometer
Scan number
15
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
Resolutions
6.0 $mm$
Experiment
Vis-NIR bidirectional reflection spectra of several ammonium salts mixed with pyrrhotite grains in sublimate residues at 173 K
Date begin
2018-07-30 13:00:00
Date end
2018-07-31 08:00:00
Release date
2020-02-12 11:12:53 UTC+0000
Version (Date)
#1 (2020-02-12 11:12:53 UTC+0000, Updated: 2020-03-18 09:01:47 UTC+0000)
History
Date Mode Version Status Comments
2019-11-21 09:28:14 UTC+0000 first import #1 valid version new reflectance spectrum
Analysis
raw bidirectional reflectance spectrum calibrated: 1) with "Spectralon 99%" measured under same geometry using its absolute BRDF (0.7-2.1 µm) and 2) with "Infragold" using its relative spectral reflectance (2.1-4.16 µm). An instrumental artefact at 980-1000 nm has been corrected.
Quality flag
4
Validator(s)