Spectrum

Mid-IR reflectance spectrum of raw chips of the Oued Chebeika CI chondrite

Title
Mid-IR reflectance spectrum of raw chips of the Oued Chebeika CI chondrite
DOI
10.26302/SSHADE/EXPERIMENT_LB_20241211_001
Data reference
Bonal, Lydie; Beck, Pierre; Poch, Olivier (2024): Vis-NIR and Mid-IR reflectance spectra, Mid-IR transmission and Raman spectra of several preparations of the Oued Chebeika 002 meteorite (CI chondrite). SSHADE/GhoSST (OSUG Data Center). Dataset/Spectral Data. https://doi.org/10.26302/SSHADE/EXPERIMENT_LB_20241211_001
Publications
Database
Experimentalists
Experiment type
laboratory measurement
Type
reflectance factor
Intensity unit
no unit
Instrument
Brucker Vertex 70 #2 – reflection Mid-IR
Sample holder
aluminum sample holder
Standard medium
vacuum
Observation mode
spectrum
Spectral range type(s)
NIR, MIR
Valid spectral range(s)
Min - Max (μm) Sampling (μm) Resolution (μm) Position accuracy (μm) Absorption edge
#1 2.3 - 18.0 0.00056
Comments
measured from 0.54 μm to 2.3 μm with SHINE and from 2.3 to 18 μm with Vertex70v instrument
Observation geometry
biconical
Observation mode
fixed angles
Incidence angle
0.0°
Emergence angle
30.0°
Observation mode
single spot
Resolutions
1.0 mm
Experiment
Vis-NIR and Mid-IR reflectance spectra, Mid-IR transmission and Raman spectra of several preparations of the Oued Chebeika 002 meteorite (CI chondrite)
Date begin
2024-11-25
Release date
2025-03-28 10:26:10 UTC+0000
Version (Date)
#1 (2025-03-28 10:26:10 UTC+0000, Updated: 2025-03-28 10:26:10 UTC+0000)
History
Date Mode Version Status Comments
2025-01-08 13:30:19 UTC+0000 first import #1 valid version
Analysis
Spectra were measured under a dry air purge, and calibrated using two reference surfaces: a reflective diffuser made of a 120 grit protected gold coating surface purchased from Edmund Optics (ref1), and a 1500 grit uncoated gold reflective ground glass diffuser purchased from Thorlabs (ref2). The former reference surface possesses some absorption features due to it protective coating, but it is spectrally flat over the studied wavelength range, whereas the latter reference surface is featureless but is less reflective as the wavelength increases. We measured a “[ref2]/[ref1]” spectrum and then computed a “[ref2]/[coating-free ref1]” spectrum by replacing the spectral ranges affected by ref1 absorption bands by a polynomial interpolation. Then, we multiplied the spectrum of “[OC 002]/[ref2]” by “[ref2]/[coating-free ref1]” to obtain the spectrum “[OC 002]/[coating-free ref1]”, free of spectral artifact + refelctance scaled on SHADOWS measurement at 2.3 μm
Quality flag
4
Validator(s)