There's an interesting article in the December 2017 issue of IEEE Spectrum.
Researchers at Oxford U. have fabricated an atomic reference based on
a single nitrogen molecule inside a 60-atom carbon sphere ("Fullerene").
The cage of carbon isolates the nitrogen from external electric fields,
and they've developed a method to also isolate it from external magnetic
fields.
They have not incorporated the material into a working standard, but have
licensed the chemical fabrication technology to at least one manufacturer.
The idea is to make a chip-scale atomic frequency reference.
-- Tom, N5EG
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