A highly surface sensitive spectroscopy which compliments the chemical and quantitative analysis offered by XPS.
Ion Scattering Spectroscopy (also known as ISS or LEIS) is a technique whereby a monoenergetic beam of He+ or Ar+ ions are scattered by the atoms in a surface.
The loss of kinetic energy due to scattering caused by the mass difference between ion and scattering atom is measured and a spectrum is produced. Clearly two atoms in a surface which have very different masses (for example, oxygen and iron) will scatter ions differently.
Unparalleled Surface Detection
Enables detection of top-most surface elements.
A powerful tool for determination of the relative surface coverage of a given element.
What's on a Surface
Study adsorption on single crystal materials.
Provides an indication of monolayer surface coverage (e.g. by a self-assembled monolayer).
How Do We Grow?
Study growth of ultra-thin layers such as those produced by atomic layer deposition (ALD).
Systems at Harwell (all), Cardiff (Ultra) and UCL (Theta Probe) are equipped with ISS.
Choice of gases
While default set up is He+, capabilities for heavier gases are available if required
Choice of energy
Either 1 keV or 3 keV sources available for separation of light of heavier elements
Prevent potential surface damage by using a beam raster
Sample pelletisation available
Need to analyse a powder sample? Pellet presses are available at the Research Complex.