Spectrum

Optical constants spectrum of 95%-N2:5%-CH4:500ppm-CO tholins derived from single scattering albedo

Title
Optical constants spectrum of 95%-N2:5%-CH4:500ppm-CO tholins derived from single scattering albedo
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Data
Unit:  Range: Valid spectral range(s): 4000.0 - 20000.0 micron
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DOI
10.26302/SSHADE/EXPERIMENT_BS_20201201_001
Data reference
Fayolle, Marie; Quirico, Eric; Potin, Sandra (2018): Bidirectional Vis-NIR reflectance spectra of two tholins samples (+ mixtures with pyrrhotite) at various illumination-observation geometries (i=0°,30°,60° - e= -70° to 70°) and their extracted single scattering albedo and optical constants spectra. SSHADE/GhoSST (OSUG Data Center). Dataset/Spectral Data. https://doi.org/10.26302/SSHADE/EXPERIMENT_BS_20201201_001
Publications
Database
Experimentalists
Spectrum type
Experiment type
laboratory measurement
Type
optical constants
Intensity unit
no unit
Model parameters
the mean diameter measured for the tholins spheres, 420nm, is used
Instrument #1
Instrument
SHADOWS Spectro-Gonio bidirectional reflection Vis-NIR
Sample holder
open sample holder (12 mm diameter, 6 mm deep) in anodized aluminum
Standard medium
vacuum
Observation mode
spectrum
Spectral range type(s)
Vis, NIR
Valid spectral range(s)
Min - Max (${\mu}m$) Sampling (${\mu}m$) Resolution (${\mu}m$) Position accuracy (${\mu}m$) Absorption edge
#1 0.5 - 0.66 0.02 0.048 0.0005
#2 0.68 - 1.42 0.02 0.096 0.001
#3 1.44 - 2.5 0.02 0.192 0.002
Scan number
10
Comments
a set of high pass filters at the monochromator output to filter the higher orders
Observation geometry
N/A
Observation mode
N/A
Comments
angular resolution is full width
Illumination
Observation
Comments
partial polarization variable with wavelength (from monochromator grating)
Observation mode
single spot
Image size
5.2 x 5.2 $mm$
Name
Tholins LATMOS 95%-N2:5%-CH4:500ppm-CO
Experiment
Bidirectional Vis-NIR reflectance spectra of two tholins samples (+ mixtures with pyrrhotite) at various illumination-observation geometries (i=0°,30°,60° - e= -70° to 70°) and their extracted single scattering albedo and optical constants spectra
Parent spectrum
Date begin
2018-08-18
Release date
2021-06-02 08:37:16 UTC+0000
Version (Date)
#1 (2021-06-02 08:37:16 UTC+0000, Updated: 2021-06-02 08:37:16 UTC+0000)
History
Date Mode Version Status Comments
2020-12-31 20:33:56 UTC+0000 first import #1 valid version
Analysis
extraction of the extinction coefficient k by inverting the single scattering albedo assuming the refractive index n of Khare et al. (1984) and the mean measured grain diameter: 420nm. The optical constants of Khare et al. (1984) allow to model quite well the visible slope and the NIR photometric level of the 95%-N2:5%-CH4:500ppm-CO tholins, but not the weak NIR bands so the use of the refractive index n from Khare et al. is justified.
Quality flag
3
Validator(s)