Experiment
Title
NIR optical constant spectra of CH4 in solid solution in alpha and beta-N2 at 5 different temperatures (35K - 43K)
Type(s)
laboratory
Description
NIR optical constant spectra of CH4 in solid solution. Beta phases at 43,41,38 and 36.5K. Changed to alpha phase at 35K
Variable(s)
temperature, sample phase
Number of spectra
5
Instrument
Nicolet 800
Sample holder
Stainless steel closed cell 10 mm thick with MgF2 windows cooled by He cryostat in UHV chamber with 2 KBr windows
Standard medium
vacuum
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 - 10000.0 0.482131412702 0.92 0.05
Orientation to sample
C axis possibly 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 $mm$
Spatial resolution
2.5 ${\pm}$ 0.5 $mm$
Comments
circular spot located in center of a monocrystal
Date begin
1992-01-01