Heavy atoms can be detected by electron microscopy, but lighter atoms, such as carbon or hydrogen, are more elusive. These bashful atoms can now be pinpointed if they are adsorbed to a single layer of graphite.
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Silcox, J. Spot the atom. Nature 454, 283–284 (2008). https://doi.org/10.1038/454283a
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DOI: https://doi.org/10.1038/454283a
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