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
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