Spectrum

Mid-IR absorbance spectrum of crystalline CH3OH ice at 17.5 K

Title
Mid-IR absorbance spectrum of crystalline CH3OH ice at 17.5 K
DOI
10.26302/SSHADE/EXPERIMENT_BS_20210913_001
Data reference
Merlin, Frederic; Quirico, Eric (2008): Mid-IR absorbance spectra of amorphous and crystalline CH3OH ice between 17 and 120 K. SSHADE/GhoSST (OSUG Data Center). Dataset/Spectral Data. https://doi.org/10.26302/SSHADE/EXPERIMENT_BS_20210913_001
Publications
Experiment type
laboratory measurement
Type
absorbance
Intensity unit
no unit
Instrument
Nicolet 800 – transmission Mid-IR
Sample holder
KBr window 2mm thick cooled by He cryostat in UHV chamber with 2 KBr windows 5mm thick
Standard medium
vacuum
Observation mode
spectrum
Spectral range type(s)
MIR
Valid spectral range(s)
Min - Max ($cm^{-1}$) Sampling ($cm^{-1}$) Resolution ($cm^{-1}$) Position accuracy ($cm^{-1}$) Absorption edge
#1 410.0 - 4000.0 0.482131 0.92 0.05
Observation geometry
direct
Observation mode
fixed angles
Incidence angle
0.0°
Emergence angle
180.0°
Azimuth angle
0.0°
Phase angle
180.0°
Resolution illumination
15.0°
Resolution observation
20.0°
Illumination
Observation
Comments
possibly partly polarized beam by beamsplitter
Observation mode
single spot
Image size
8.0 x 8.0 $mm$
Experiment
Mid-IR absorbance spectra of amorphous and crystalline CH3OH ice between 17 and 120 K
Date begin
2008-02-04 15:36:00
Release date
2021-09-16 17:57:24 UTC+0000
Version (Date)
#1 (2021-09-16 17:57:24 UTC+0000, Updated: 2021-09-16 17:57:24 UTC+0000)
History
Date Mode Version Status Comments
2021-09-12 20:54:20 UTC+0000 first import #1 valid version
Analysis
Transmission spectra relative to a reference spectrum of the bare KBr window measured at 17K, simply converted to absorbance. Weak residual lines of CO2 and H2O gases in the purged spectrometer also appear in the 2300-2380, 1500-1900 and 3600-3900 cm-1 ranges, respectively. A weak and narrow band due to trace amount of CO2 in the sample also appears at 667.8 cm-1.
Quality flag
4
Validator(s)