MIR optical constants spectrum of crystalline CH4-I at 38-40K
- Title
- MIR optical constants spectrum of crystalline CH4-I at 38-40K
- Data reference
- Trotta, Frederic; Schmitt, Bernard; Grundy, Will (1995): Vis-NIR-MIR optical constants spectrum of crystalline CH4-I at 39K. SSHADE/GhoSST (OSUG Data Center). Dataset/Spectral Data.
- Publications
- Associated band lists
- Database
- Experimentalists
- Experiment type
- laboratory measurement
- Type
- optical constants
- Comments
- weak spectral slope below 1000 cm-1 seems real but could be questionable. n(15800cm-1)= 1.32 for CH4-I at 39K to be verified]
- Instrument
- Nicolet 800 – transmission Mid-IR
- 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 #1 580.0 - 5500.0 0.482131412701804 0.92 0.05
Illumination
Observation
- Comments
- possibly partly polarized beam by beamsplitter
- Observation mode
- single spot
- Instrument
- Nicolet 800 – transmission Near-IR
- 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 - 7000.0 0.482131412701804 0.92 0.05
Illumination
Observation
- Comments
- possibly partly polarized beam by beamsplitter
- Observation mode
- single spot
- Instrument
- Nicolet 800 – transmission Visible/red
- 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 - 14000.0 0.482131412701804 0.92 0.05
Illumination
Observation
- Comments
- possibly partly polarized beam by beamsplitter
- Observation mode
- single spot
- Experiment
- Vis-NIR-MIR optical constants spectrum of crystalline CH4-I at 39K
- 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-I optical constants spectrum 39K (MIR+NIR+Vis)
- Analysis
- Iterative inversion of n and k with full optical model of the thin film+substrate + Kramers-Kronig analysis over 580-4750cm-1 range (MIR) and n(15800cm-1)= 1.32 (F. Trotta thesis 1996) - k values < 1e-2 (above 2000 cm-1) are derived from the absorption coefficients of Grundy et al. 2002 in the limit of small k values, i.e., with k = alpha/(4*pi*nu). In very very weak minima between bands in the visible (11965-12260cm-1, 13115-13440 cm-1) k is set to 3e-9. n is smoothed outside CH4 bands to reduce noise. Interpolation in k and n is used to remove the weak CO2 and H2O residual gas band (2305-2385 and 3550-3820 cm-1).
- Quality flag
- 5
- Validator(s)