Near and Mid-IR optical constants of crystalline H2O ice Ih at 140-145K
- Title
- Near and Mid-IR optical constants of crystalline H2O ice Ih at 140-145K
- DOI
- 10.26302/SSHADE/EXPERIMENT_BS_20200103_001
- Data reference
- Schmitt, Bernard (2004): Near and Mid-IR optical constants of crystalline H2O ice Ih at 140-145K. SSHADE/GhoSST (OSUG Data Center). Dataset/Spectral Data. https://doi.org/10.26302/SSHADE/EXPERIMENT_BS_20200103_001
- Publications
- Associated band lists
- Database
- Experimentalists
- Experiment type
- laboratory measurement
- Type
- optical constants
- Comments
- composite k spectrum at 2 slightly different temperatures (140K-NIR and 145K-MIR) and n spectrum at 145K, plus extension to Vis-UV with 270K data
- Instrument
- Nicolet 800 – transmission Mid-IR
- Sample holder
- CsI 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 #1 650.0 - 4000.0 0.4821314 0.92 0.05 - Scan number
- 193
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 $mm$
- Instrument
- Nicolet 800 – transmission Near-IR
- Sample holder
- cryogenic closed cell, with 2 saphire windows 2mm thick, cooled by He cryostat in UHV chamber with 2 KBr windows
- 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 4000.0 - 10500.0 0.4821314 0.92 0.05
Illumination
Observation
- Comments
- possibly partly polarized beam by beamsplitter
- Observation mode
- single spot
- Image size
- 2.5 x 2.5 $mm$
- Experiment
- Near and Mid-IR optical constants of crystalline H2O ice Ih at 140-145K
- Date begin
- 2004-08-04
- Release date
- 2020-01-03 15:23:20 UTC+0000
- Version (Date)
- #1 (2020-01-03 15:23:20 UTC+0000, Updated: 2020-01-03 15:24:04 UTC+0000)
- History
-
Date Mode Version Status Comments 2020-01-03 14:54:23 UTC+0000 first import #1 valid version
- Analysis
- 'k' and 'n' in the mid-IR are obtained by iterative inversion of thin films spectra with full optical model of the film+substrate + Kramers-Kronig analysis and n(15800$cm^{-1}$)= 1.31 (F. Trotta thesis, 1996). The imaginary part 'k' of the optical constants in the Near-IR (> 4000$cm^{-1}$ , <2.5 µm)is derived from the absorption coefficients of Grundy and Schmitt (1998) obtained with a series of thick crystal (0.1 to 10 mm). The 'n' part is extrapolated from the Mid-IR values. Very weak k values < $5~10^{-7}$ between the weakest bands (around 9000 $cm^{-1}$, 1.1µm) are interpolated. The data are completed in the Visible and UV (> 10500 $cm^{-1}$, < 0.95µm) with data at 270K from Warren (1986).]
- Quality flag
- 4
- Validator(s)