Researchers have observed the Lyman-alpha transition in the antihydrogen atom

Re:Researchers have observed the Lyman-alpha transition in t... by Blackbeard_ on Friday August 24, 2018 @10:13AM (#17835032)

That would be more than a 5 sigma difference which would definitely be significant but that number you're quoting for normal hydrogren is the 1S-2S line.

This measurement is the 1S-2P line which has an average frequency of ~2,466,051.625 GHz (there's actually two levels). Which agrees to within 1 sigma - i.e. good agreement.

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Re:Researchers have observed the Lyman-alpha transition in t... by gus_massa on Friday August 24, 2018 @03:25PM (#17837253)

Thanks for the correction. I just assumed that the other article was about the same transition and I forget to check the details.

PS: If someone else wants to know why the 1S-2S and the 1S-2P transition have almost the same energy, but no exactly the same energy, it's an interesting weird story https://en.wikipedia.org/wiki/Lamb_shift

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