Magnetic Resonance

EPR, one atom at a time

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Science  23 Oct 2015:
Vol. 350, Issue 6259, pp. 394-396
DOI: 10.1126/science.350.6259.394-k

Electron paramagnetic resonance (EPR) usually detects atoms with unpaired electrons as ensemble averages. Baumann et al. used a spin-polarized scanning tunneling microscope tip to measure EPR spectra of single iron atoms adsorbed on a magnesium oxide surface at cryogenic temperatures. The measurement depends on the atomic orbital symmetry; no signal was observed for cobalt atoms under the same conditions

Science, this issue p. 417

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