This page is a quick overview of the multitechnic and multipurpose goniometer and its large possibilities.

 

Download a short descrition of GMT (in french, extracted from Annual Report 2013)

This goniometer at BM32 is specially designed for:

surface X-ray scattering experiments

at energy up to 30keV

on solid or liquid samples

1- Multiple Uses

The goniometer has been designed to allow :

  • grazing incidence diffraction
  • reflectivity
  • other surface diffraction techniques
  • diffuse or non specular angle scattering at grazing incidence

2- Detection and sample environment

Beam collimation :

  • A complete system of entrance slits (accuracy 1 µm) is available for beam conditioning and alignment.
  • Sollers slits (1.4 mrad angular resolution).

Detection :

  • 0D : a low background and fast NaI scintillation detector
  • 1D : a linear gas detector (Position Sensitive Detector) (VANTEC Bruker)
  • 2D :
    • square CCD camera Photonics Science ImageStar, 1500*1500 pixels (44 microns/pixel)
    • rectangular pixel detector ESRF MaxiPix, 256*1280 pixels (55 microns/pixel)

Photodiodes and X-ray camera for intensity normalisation and alignement

 

Standart sample environment and accessories :

  • Liquid helium cryostat (from 1.5 to 300K)
  • Furnace in vacuum chamber (from 25 to 900°C radiative mode; up to 1500°C electron bombardement mode)
  • Circulating bath (from -10 to 70°C)
  • Be hemispherical chamber (to be soon available)

3- Typical and recent experiments

   

Study of the buried SiO2 layer between two molecularly bounded Si wafers

Reflected intensity allows to study the thickness and the roughness of the Si oxide layer as a function of preparation parameters.

 

 collagesi
gisaxsmulticouche

 

Study of multilayers of metallic nanoparticles embedded in oxide

Grazing Incidence Small Angle Scattering (GISAXS) measurements were done using 2D CCD camera to determine the organization of Co particles in and out of the layers plane.

Study of the stress and the texture in submicronic in situ annealed Cu wires

Theta-2Theta measurements with respect to tilted Miller planes on textured and crystallised Cu wire show the intensity of the stresses.

 cufil
oilwater

Study of amphiphilic polymers at the oil-water interface

Diffuse scattering by the interfacial layer allows the determination of the structure and fluctuations of the film.

Study of Langmuir films

Scattered intensity out of the incident plane reveal the in-plane correlations and order of self-organized molecules.

 langmuir