Precision spectroscopy of metastable hydrogen and antihydrogen with a Lamb-shift polarimeter
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A spinfilter, the most important component of a Lamb-shift polarimeter, can be used to produce a beam of metastable hydrogen (deuterium) atoms in one hyperfine state (α1, α2 and together with the Sona transition β3). As function of a magnetic field separated transitions between the 2S 1/2 metastable hyperfine states seem to be observable as well as single transitions into the short-lived 2P 1/2 and 2P 3/2 states. The Breit-Rabi diagrams for these states can be measured with good precision. Furthermore, the hyperfine splittings and the Lamb shift can be observed as well. Application of this method to anti-hydrogen atoms are suggested.