Let's say we have a material AB. Is it possible to detect atomic clusters of A atoms experimentally?
The size of clusters in question: 2 atoms (nearest neighbour pairs), 3 atoms (nn triangles), 4 atoms (nn tetrahedrons).
One possibility would be to investigate the local structure with EXAFS. Since the interatomic distance is the basic physical quantity to which EXAFS is sensitive. From the shape and strength of the changes in X-ray absorption, it can be concluded at what distance from the ionized atom it is scattered and how strongly, thus obtaining a so-called radial distribution function. From this it can be roughly estimated at what distance which or (if the atomic types of the ligands are known) how many atoms can be located there.
https://xrayabsorption.org/
https://xafs.xrayabsorption.org/
https://bruceravel.github.io/demeter/
One possibility would be to investigate the local structure with EXAFS. Since the interatomic distance is the basic physical quantity to which EXAFS is sensitive. From the shape and strength of the changes in X-ray absorption, it can be concluded at what distance from the ionized atom it is scattered and how strongly, thus obtaining a so-called radial distribution function. From this it can be roughly estimated at what distance which or (if the atomic types of the ligands are known) how many atoms can be located there.
https://xrayabsorption.org/
https://xafs.xrayabsorption.org/
https://bruceravel.github.io/demeter/
You may try the radial distribution function...or very high magnified TEM, atomic resolution TEM with EELS
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