Spectrum

Vis-NIR reflectance spectrum of sublimating Water ice particles containing NH4-Nontronite and mixed with Magnetite, Antigorite, Dolomite at 173 K (t=3h)

Title
Vis-NIR reflectance spectrum of sublimating Water ice particles containing NH4-Nontronite and mixed with Magnetite, Antigorite, Dolomite at 173 K (t=3h)
DOI
10.26302/SSHADE/EXPERIMENT_OP_20200623_001
Data reference
Schroeder, Stefan; Poch, Olivier; Ferrari, Marco; DeAngelis, Simone (2019): Vis-NIR reflectance spectra of a mixture of Magnetite, NH4-Nontronite, Antigonite and Dolomite, pure, mixed with Water ice, during and after ice sublimation. SSHADE/CSS (OSUG Data Center). Dataset/Spectral Data. https://doi.org/10.26302/SSHADE/EXPERIMENT_OP_20200623_001
Publications
Experiment type
laboratory measurement
Type
reflectance factor
Comments
At 1.3-1.5 µm, 1.8-2.0 µm and 2.4-3.0 µm, the spectrum is affected by 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, 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
#1 500.0 - 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 - 4180.0 20.0 26.0
Filters
Type Center/Edge ($nm$) Width ($nm$) Place
#1 long-pass filters of the spectro-gonio radiometer
Scan number
1
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 $mm$
Name
Sublimation residue made of mineral mixture (Magnetite 63wt%, NH4-nontronite 22wt%, Antigorite 9wt%, Dolomite 6wt%) on Water ice particles 67±31μm mixed with 1wt% of the same mineral mixture at 173 K
Changes
After 3h under high vacuum, the sublimation of water ice left a desiccated layer on top of the sample, made of the minerals which covers the ice particles still sublimating below this layer.
Experiment
Vis-NIR reflectance spectra of a mixture of Magnetite, NH4-Nontronite, Antigonite and Dolomite, pure, mixed with Water ice, during and after ice sublimation
Date begin
2019-04-23
Release date
2020-11-02 14:08:06 UTC+0000
Version (Date)
#1 (2020-11-02 14:08:06 UTC+0000, Updated: 2020-11-02 14:08:06 UTC+0000)
History
Date Mode Version Status Comments
2020-06-26 09:24:51 UTC+0000 first import #1 valid version
Analysis
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)
Quality flag
4
Validator(s)