Experiment
Title
Vis-NIR bidirectional reflection spectra of several ammonium salts mixed with graphite powder at 296 K
DOI
10.26302/SSHADE/EXPERIMENT_OP_20200212_001
Data reference
Poch, Olivier (2018): Vis-NIR bidirectional reflection spectra of several ammonium salts mixed with graphite powder at 296 K. SSHADE/GhoSST (OSUG Data Center). Dataset/Spectral Data. https://doi.org/10.26302/SSHADE/EXPERIMENT_OP_20200212_001
Publications
Database(s)
Experimentalists
Type(s)
laboratory measurement
Description
Mixtures of graphite powder (<20 µm) and ammonium (NH4+) salts (chloride, sulfate, formate) were prepared by mixing manually these constituents in a mortar. Reflectance spectra (from 0.4 to 4 µm) of these mixtures were measured at 296 K under ambient air.
Number of spectra
4
Variable type(s)
  • sample composition
  • sample abundance
  • constituent
Comments
Several mixtures were produced in different experiments, with various type and relative concentration of ammonium salts compared to graphite.
Instrument
SHINE Spectro-Gonio bidirectional reflection Vis-NIR
Sample holder
Aluminum sample holder, cylindrical 10 mm diameter and 1 mm depth
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
#1 440.0 - 1380.0 20.0 10.0
#2 1400.0 - 2980.0 20.0 19.0
#3 3000.0 - 4180.0 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
2018-09-27 - 2018-10-01

Versions

Release date
2020-02-12 11:12:12 UTC+0000
Version (Date)
#1 (2020-02-12 11:00:46 UTC+0000, Updated: 2020-03-18 09:01:25 UTC+0000)