A 'comb' of photons at evenly spaced frequencies in the extreme ultraviolet has been generated. It will allow a more precise search for variation in the fine-structure constant, which sets the strength of the electromagnetic force. See Letter p.68
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Young, L. A comb in the extreme ultraviolet. Nature 482, 45–46 (2012). https://doi.org/10.1038/482045a
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DOI: https://doi.org/10.1038/482045a
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