Spectrum

Vis-NIR absorption coefficient spectrum of CH4 phase-II at 20 K

Title
Vis-NIR absorption coefficient spectrum of CH4 phase-II at 20 K
DOI
10.26302/SSHADE/EXPERIMENT_BS_20130114_001
Data reference
Grundy, Will; Schmitt, Bernard (2001): Vis/Near-IR absorption coefficients spectra of liquid CH4, solid CH4-II and CH4-I from 93 to 20 K. SSHADE/GhoSST (OSUG Data Center). Dataset/Spectral Data. https://doi.org/10.26302/SSHADE/EXPERIMENT_BS_20130114_001
Publications
Experiment type
laboratory measurement
Type
absorption coefficient
Intensity unit
$cm^{-1}$
Comments
Band around 3010 cm-1 saturated
Instrument
Nicolet 800 – transmission Near-IR
Sample holder
Closed cells of variable thicknesses (0.1, 1, 10 mm) in UHV chamber
Standard medium
vacuum
Observation mode
spectrum
Spectral range type(s)
NIR
Valid spectral range(s)
Min - Max ($cm^{-1}$) Sampling ($cm^{-1}$) Resolution ($cm^{-1}$) Position accuracy ($cm^{-1}$) Absorption edge
#1 2000.0 - 3002.0
#2 3016.0 - 7000.0
Scan number
100
Observation geometry
direct
Observation mode
fixed angles
Illumination
Type of polarization
no
Observation
Type of polarization
no
Comments
possibly partly polarized beam by beamsplitter
Observation mode
single spot
Image size
2.5 x 2.5 $mm$
Resolutions
2.5 ${\pm}$ 0.5 $mm$
Instrument
Nicolet 800 – transmission Visible/red
Sample holder
Closed cells of variable thickness (0.1, 1, 10 mm) in UHV chamber
Standard medium
vacuum
Observation mode
spectrum
Spectral range type(s)
Vis
Valid spectral range(s)
Min - Max ($cm^{-1}$) Sampling ($cm^{-1}$) Resolution ($cm^{-1}$) Position accuracy ($cm^{-1}$) Absorption edge
#1 7000.0 - 11400.0
Scan number
100
Observation geometry
direct
Observation mode
fixed angles
Illumination
Type of polarization
no
Observation
Type of polarization
no
Comments
possibly partly polarized beam by beamsplitter
Observation mode
single spot
Image size
2.5 x 2.5 $mm$
Resolutions
2.5 ${\pm}$ 0.5 $mm$
Experiment
Vis/Near-IR absorption coefficients spectra of liquid CH4, solid CH4-II and CH4-I from 93 to 20 K
Date begin
2001-01-01
Release date
2018-02-27 11:43:15 UTC+0000
Version (Date)
#1 (2018-02-27 11:43:15 UTC+0000, Updated: 2019-12-28 16:55:13 UTC+0000)
History
Date Mode Version Status Comments
2017-11-17 17:16:56 UTC+0000 first import #1 valid version 2012-09-24: new CH4 phase-II absorption coefficient spectrum 20K (near-IR)
Analysis
Lambert absorption coefficient spectra α(ν) were computed from transmission spectra, using procedures described by Grundy et al. (1993) and Grundy and Schmitt (1998), based on the Beer–Lambert absorption law. Different sample thicknesses (0.1, 1, 10mm) and measurements in Vis and NIR ranges were concatenated over different wavelength portions to derive this absorption coefficient spectrum. Negative noise set to 3e-4 cm-1
Quality flag
3
Validator(s)