Near-infrared reflectance spectra at 172K of the transition between Diammonium hydrogen phosphate-beta and gamma [(NH4)2HPO4] powder with 32-80µm grain size
- Title
- Near-infrared reflectance spectra at 172K of the transition between Diammonium hydrogen phosphate-beta and gamma [(NH4)2HPO4] powder with 32-80µm grain size
- DOI
- 10.26302/SSHADE/EXPERIMENT_BS_20241809_001
- Data reference
- Fastelli, Maximiliano; Schmitt, Bernard; Beck, Pierre; Poch, Olivier (2021): Near-infrared reflectance spectra at low temperature (110-290K) of delta, gamma and beta Diammonium hydrogen phosphate [(NH4)2HPO4] powders with three grain size ranges (32-80, 80-125 and 125-150µm). SSHADE/CSS (OSUG Data Center). Dataset/Spectral Data. https://doi.org/10.26302/SSHADE/EXPERIMENT_BS_20241809_001
- Publications
- Database
- Experimentalists
- Experiment type
- laboratory measurement
- Type
- reflectance factor
- Intensity unit
- no unit
- Instrument
- SHINE Spectro-Gonio bidirectional reflection Vis-NIR
- Sample holder
- Cylindrical aluminum sample holder placed in the isothermal CarboN-IR cryogenic cell with two saphire windows.
- Standard medium
- vacuum
- Observation mode
- spectrum
- Spectral range type(s)
- NIR
- Valid spectral range(s)
-
Min - Max ($nm$) Sampling ($nm$) Resolution ($nm$) Position accuracy ($nm$) Absorption edge #1 1000.0 - 1600.0 10.0 7.55 1.0 #2 1610.0 - 2830.0 10.0 15.3 1.5 #3 2840.0 - 3200.0 10.0 31.0 3.0 #4 3220.0 - 4180.0 20.0 30.9 3.0 #5 4340.0 - 4600.0 20.0 30.75 3.0 - Scan number
- 10
- Comments
- A series of high pass filters is used to remove high orders of the gratings
Definition: incidence and emergence angles are positive with origin at nadir, and vary in same direction. Azimuth origin (increasing clockwise) is for i = e (opposition geometry).
- Observation geometry
- bidirectional
- Observation mode
- fixed angles
- Incidence angle
- 0.0°
- Emergence angle
- 20.0°
- Azimuth angle
- 0.0°
- Phase angle
- 20.0°
- Resolution illumination
- 5.8°
- Resolution observation
- 4.1°
- Comments
- 'Gognito' illumination attachment with focused beam.
Illumination
Observation
- Comments
- Partial polarization variable with wavelength (from the 3 monochromator gratings used)
- Observation mode
- single spot
- Resolutions
- 7.5 $mm$
- Name
- Ammonium hydrogen phosphate powder (Phase beta) - grains: 32-80µm
- Changes
- partly transformed to phase gamma of Diammonium hydrogen phosphate during warming to 172K
- Experiment
- Near-infrared reflectance spectra at low temperature (110-290K) of delta, gamma and beta Diammonium hydrogen phosphate [(NH4)2HPO4] powders with three grain size ranges (32-80, 80-125 and 125-150µm)
- Date begin
- 2021-10-30 21:46:00
- Release date
- 2024-09-28 05:17:32 UTC+0000
- Version (Date)
- #1 (2024-09-28 05:17:32 UTC+0000, Updated: 2024-09-28 05:17:32 UTC+0000)
- History
-
Date Mode Version Status Comments 2024-09-23 06:34:04 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 (1000-1300nm) and 2) with "Infragold" using its relative spectral reflectance (1300-4800nm). The multiple reflections from the two saphire windows of the cell are corrected by a calibration function taking into account the sample surface reflectance. Only minor residual water vapor line are observed in the 1350-1420 and 2600-2780 nm ranges.
- Quality flag
- 4
- Validator(s)