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EXAFS

EXAFS (extended X-ray absorption fine structure) relies on the small fluctuations observed in the absorption coefficient close to an absorption edge to give information on the local electronic states of the species whose edge is being observed.

What is EXAFS?

EXAFS (extended X-ray absorption fine structure) relies on the small fluctuations observed in the absorption coefficient close to an absorption edge to give information on the local electronic states of the species whose edge is being observed.

XAFS image 1

How does EXAFS work?

A monochromatic beam of X-rays is directed at a sample with an energy dispersive detector positioned behind to measure the flux of transmitted X-rays. The energy of the beam is precisely tuned below the absorption edge of the element under investigation and is then steadily increased above and beyond the edge to collect information on the energy dependence of the absorption.

[Normalised absorption versus energy for copper foil at count rates from 17 – 650k counts per second.]

What are some advantages of EXAFS?

Unlike standard X-ray photoelectron spectroscopy, which is generally limited to information on the species present in a sample, EXAFS can give information on the chemical nature of the species present in a sample.

Screenshot 2021-12-16 at 16.44.21

What can EXAFS detect?

EXAFS supplies information on local electronic states. I.e. It allows one to identify the nature of the bonds the target atom has to its neighbours and can thus give information the chemical nature of a sample.

[EXAFS signal versus Wavenumber for Copper foil at count rates from 17 – 650k counts per second. The red line showing a noisier signal is suffering from low signal, being the 17-27 kcps data.]
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