Experiment
Title
Vis-NIR bidirectional reflection spectra of several ammonium salts mixed with pyrrhotite grains in sublimate residues 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
Type(s)
laboratory measurement
Description
Dry mixtures (called "sublimate residues") of sub-micrometer size opaque pyrrhotite (Fe1-xS) grains with ammonium (NH4+) salts (chloride, sulfate, formate, carbamate, citrate) were prepared by sublimation of ice-dust mixtures. Reflectance spectra (from 0.4 to 4 µm) of these mixtures were measured at 173 K under high vacuum (pressure lower than 10^-5 mbar).
Number of spectra
8
Variable type(s)
  • sample composition
  • sample abundance
  • constituent
Comments
Several sublimate residues were produced in different experiments, with various type and relative concentration of ammonium salts compared to pyrrhotite.
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
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 $mm$
Date begin - end
2018-07-13 - 2018-12-19

Versions

Release date
2020-02-12 11:12:53 UTC+0000
Version (Date)
#1 (2019-11-21 09:28:14 UTC+0000, Updated: 2020-03-18 09:01:47 UTC+0000)