Welcome to I20-EDE

Unfortunately, the number of users applying to I20-EDE is insufficient to justify the resources needed to maintain the beamline, and thus the hard decision to cease operating the beamline in 2023 has been reached. We also need to make room for the a new monochromator on the scanning branch.  Hence AP32 (October 2022- March 2023) will be the last application period for which I20-EDE is open to users. For Diamond II one of the the first new beamlines is rapid scanning XAS beamline SWIFT, which will be able to do many of the experiments currently performed on I20-EDE. Thus applications for I20-EDE for AP33 are not being accepted.

The principle of the Energy Dispersive EXAFS (EDE) beamline is based on the diffraction of non monochromatic X-rays by a bent crystal (polychromator crystal). The polychromatic beam is focused onto the sample and then diverges towards a position sensitive detector where beam position is correlated to energy.

The dispersive configuration of XAS has two main advantages that make it scientifically attractive. First, the whole X-ray absorption spectrum is collected simultaneously which makes the technique especially useful for the study of fast processes. Second, the size of the focussed beam at the sample position is small and very stable due to the fact that no movement of optical elements is required to collect the spectral data.

A Mar diffraction detector on the beamline, giving the opportunity to collect Diffraction data in parallel with spectroscopy data on the beamline.