Installation3

Installation 3: Optical transmission and reflectivity and light scattering

 

Optical transmission

allowing optical absorption coefficient determination and imaginary part of refraction index
Gas absorption (Samson cell):

allowing gas optical absorption cross sections determination
Optical reflectivity allowing material optical reflectivity determination and  providing entry data for determination of real and imaginary parts of dielectric constant (e.g. by Kramers-Kronig  relations or fitting to the experiment) in cubic and anisotropic materials
Light scattering

providing entry data for roughness determination and optical slope errors

 

How to measure:

Optical transmission

Optical transmission and related absorption coefficient can be  obtained in a variety of modes, incidence  geometries and polarization state in the photon energy range covered by BABE including:

  • Transmission set up (Lambert’s law), suitable for thin self standing samples or   gasesElectron emission (Total
  • Electron Yield, Partial Electron Yield, Auger Yield) for solid   samples (and surfaces)
  • Photon Yield (Total Optical Luminescence Yield, Energy Resolved  Optical   Luminescence Yield, Total Fluorescence Yield, Energy Resolved Fluorescence Yield) for   solid samples (and surfaces)

Codes for analysis of anisotropic materials transmission can be provided
Optical reflectivity

Optical reflectivity and material optical constants can be  obtained in a variety of modes, incidence  geometries and polarization state in the photon energy range covered by BABE Detection of incident and reflected light can be accomplished by photodiodes or electron multiplier detectors
 Light scattering

Diffuse reflectivity – Light scattering provides access to surface roughness  and slope errors in the photon energy range covered by BABE including rocking scan and detector scan modes with a typical wave vector resolution of the order of 10-2 nm-1

Diffuse reflectivity – Light scattering provides access to surface roughness  and slope errors in the photon energy range covered by BABE including rocking scan and detector scan modes with a typical wave vector resolution of the order of 10-2 nm-1.

Light detection is accomplished by  photodiodes or electron multipliers, custom  detection systems – e.g. by CCD detector – can be considered

.

Light detection is accomplished by  photodiodes or electron multipliers, custom  detection systems – e.g. by CCD detector – can be considered