Mid-IR absorbance spectrum of amorphous CH3OH ice at 55 K
- Title
- Mid-IR absorbance spectrum of amorphous CH3OH ice at 55 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
- Database
- Experimentalists
- 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
Definition: incidence and emergence angles are positive with origin at nadir. Emergence angle in transmission is larger than 90° (=180°-i).
- 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 13:22:00
- 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. Two weak 'difference bands' of H2O trapped in the KBr substrate appear at 3447 and 3487 cm-1 due to the temperature difference between sample and reference at 17K (temperature change of the width of these bands). 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.
- Quality flag
- 4
- Validator(s)