Auger Electron Spectroscopy (AES) provides elemental composition of test surfaces, based on Auger electrons released by the interaction of a focused high energy electron beam and surface layers of the test material. The Infinita Lab network of testing labs, USA, offers the AES test to our clients in the USA and worldwide.
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Auger electron spectroscopy
Auger electron spectroscopy (AES) utilizes a high-energy electron beam to excite surface layers of the test sample and by detecting the energy and quantities of the resulting Auger electrons, the elemental composition of the sampled surface can be inferred.
While the beam’s excitation volume within the sample may extend upto 5 microns, the emission of Auger electrons occurs only within the first 2 to 10 atomic layers, corresponding to a depth of 1 nm to 5 nm. An AES spectrum is obtained by plotting auger electron numbers against their respective kinetic energies, which are characteristic of the elements from which the electrons were released. The intensity of an AES peak depends on the amount of element present, while the peak position is element dependent. Since auger electrons carry information from depth of just a few nanometres, it is a good technique for surface sensitive analysis. Further, the electron beam diameter is typically less than 10 nm and hence small surface features can be analysed at this resolution.
Important elements of an Auger spectrometer include a vacuum system, an electron source, and a detector. AES must be performed at ultra-high vacuum to ensure residual gases are nor adsorbed on the test surface. AES, in combination with surface sputtering by helium or argon ions, provides a means for depth profiling, giving elemental distributions upto 1 micron thickness.
AES is a valuable tool for research, development and quality control in advanced technologies based on surface chemistry and nanotechnology.
Common Uses of Auger Electron Spectroscopy (AES)
Research and development in the surface chemistry of thin films and coatings
Analysis ofnanoparticle ensembles and chemical mapping of individualnanoparticles
Study of grain boundaries in metals and ceramics
Quality control in applications such as catalysis, magnetic media, adhesives, display technologies and integrated circuits.
Advantages of Auger Electron Spectroscopy (AES)
High surface sensitivity (within 10 atomic layers)