Precision Spectroscopy of Hydrogen with a Lamb-Shift Polarimeter

A spinfilter, the most important component of a Lamb-shift polarimeter, is used to produce a beam of metastable hydrogen (deuterium) atoms in one hyperfine state (HFS)(alpha1, alpha2 and together with the Sona transition beta3). As function of a magnetic field separated transitions between the 2s{sub 1/2} metastable Zeeman states seem to be observable as well as single transitions into the short-lived 2P{sub 1/2} and 2P{sub 3/2} states. The Breit-Rabi diagrams for these states and, therefore, the g factors 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 is suggested.