Precision Tests of QED in Strong Fields and Nuclear Contributions
The most simple of all atoms is hydrogen. One might imagine that its fundamental structure should allow for a theoretical description of the hydrogen spectrum at least as accurate as given by experiment. But as a matter of fact theory could not meet this requirement. E. g., the hyperfine structure splitting of the ground state of hydrogen, the well known 21cm radiation, has been measured1 with a relative accuracy of about 10−12. Despite enormous efforts that have been spend in order to calculate this value no better relative accuracy1 than about 10−6 has been achieved.
KeywordsBismuth Plague Fermium
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