MIR optical constants spectrum of crystalline CH4-II at 15K
- Title
- MIR optical constants spectrum of crystalline CH4-II at 15K
- Data reference
- Trotta, Frederic; Schmitt, Bernard (1995): MIR optical constants spectrum of crystalline CH4-II at 15K. SSHADE/GhoSST (OSUG Data Center). Dataset/Spectral Data.
- Publications
- Database
- Experimentalists
- Experiment type
- laboratory measurement
- Type
- optical constants
- Comments
- weak spectral slope below 1250 cm-1 seems real but could be questionable
- Instrument
- Nicolet 800 – transmission Mid-IR
- Sample holder
- CsI window 2mm thick cooled by He cryostat in UHV chamber with 2 CsI 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 #1 600.0 - 5500.0 0.482131412701804 0.92 0.05 - Scan number
- 100
Illumination
- Type of polarization
- no
Observation
- Type of polarization
- no
- Comments
- possibly partly polarized beam by beamsplitter
- Observation mode
- single spot
- Image size
- 8.0 x 8.0 $mm$
- Resolutions
- 8.0 ${\pm}$ 1.0 $mm$
- Experiment
- MIR optical constants spectrum of crystalline CH4-II at 15K
- Date begin
- 1995-12-28
- Release date
- 2018-01-31 23:51:01 UTC+0000
- Version (Date)
- #1 (2018-01-31 23:51:01 UTC+0000)
- History
-
Date Mode Version Status Comments 2017-11-17 17:16:56 UTC+0000 first import #1 valid version 2013-02-19: new crystalline CH4-II optical constants spectrum 15K (MIR)
- Analysis
- Iterative inversion of n and k with full optical model of the film+substrate + Kramers-Kronig analysis over 570-5960cm-1 range and n(15800cm-1)= 1.36 (F. Trotta thesis 1996) - k is set to 0 and n is smoothed outside CH4 bands to reduce noise. Interpolation is used to remove the CO and CO2 residual gas band (2070-2220 and 2295-2385cm-1), CO2 solid ? (668 cm-1) and unknown narrow (spurious?) lines at 3374, 3414, 3429, 3450, 3501 and 5609 cm-1.
- Quality flag
- 4
- Validator(s)