NIR Optical constants spectrum of beta-N2 crystal at 38 K
- Title
- NIR Optical constants spectrum of beta-N2 crystal at 38 K
- DOI
- 10.26302/SSHADE/EXPERIMENT_BS_20120925_001
- Data reference
- Quirico, Eric; Schmitt, Bernard; Grundy, Will (1992): Near-IR Optical constants spectra of alpha and beta N2 ices at different temperatures. SSHADE/GhoSST (OSUG Data Center). Dataset/Spectral Data. https://doi.org/10.26302/SSHADE/EXPERIMENT_BS_20120925_001
- Publications
- Database
- Experimentalists
- Experiment type
- laboratory measurement
- Type
- optical constants
- Instrument
- Nicolet 800 – transmission Near-IR
- Sample holder
- Cooper closed cell 10 mm thick with MgF2 windows 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 4550.0 - 4850.0 0.482131412701804 0.92 - Comments
- only overtone bands range measured except for spectrum at 36.5K (fundamental and overtone bands measured in 2 separate spectral ranges)
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
- 25.0°
- Comments
- crystals C axis possibly mostly perpendicular to beam axis
Illumination
- Type of polarization
- no
Observation
- Type of polarization
- no
- Comments
- possibly partly polarized beam by beamsplitter
- Observation mode
- single spot
- Image size
- 2.5 x 2.5 $mm$
- Resolutions
- 2.5 ${\pm}$ 0.5 $mm$
- Comments
- circular spot located in center of a monocrystal
- Experiment
- Near-IR Optical constants spectra of alpha and beta N2 ices at different temperatures
- Date begin
- 1998-03-17
- Release date
- 2018-01-31 23:51:01 UTC+0000
- Version (Date)
- #1 (2018-01-31 23:51:01 UTC+0000, Updated: 2019-11-02 09:18:03 UTC+0000)
- History
-
Date Mode Version Status Comments 2017-11-17 17:16:56 UTC+0000 first import #1 valid version new beta-N2 optical constants spectrum at 38K (near-IR)
- Analysis
- The imaginary part 'k' of the overtone optical constants are derived from the absorption coefficient 'alpha' of Grundy et al. 1993. in the limit of small k values (k < 1e-2), i.e., with k = alpha/(4*pi*nu). The real part 'n' values is constant and equal to the visible value (n = 1.23)
- Quality flag
- 3
- Validator(s)