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Identifiying a Single Atom on Graphene

Not only is it the highest art of EDS to obtain spectra of a single atom, but it can also provide valuable new information on the excitation properties of specific elements.

In this case a graphene monolayer containing a single silicon atom was analyzed using EELS and EDS simultaneously. With both methods the atom could be identified as Si. Also a Pt atom could be identified. (Data published in Applied Physics Letters, 100, 154101 (2012).) The EDS spectrum is shown in the lower image. Considering the beam current and acquisition time used, one would have expected roughly twice as many counts according to current  models. As the finding was consistent for other elements as well, further investigation would be interesting.