We report the results of a measurement of the Lamb shift in the n =2 state of muonium. Muonium atoms in the metastable 2S state were produced by the beam-foil method and the formation rate was determined by observation of the Ly-a photons emitted when the metastable atoms were quenched in a static electric field. The Lamb shift (4'&") was measured through observation of the microwave-induced 2'S&&2-2'P&&2 transition with the result $&"=1042» MHz. This result is in agreement with the current theoretical value.
The first measurement of the hfs interval Ay for the muonic helium atom ( 4 He + "V<0° is reported. In terms of its electronic structure, it is a heavy isotope of hydrogen. Polarized atoms are formed by stopping polarized negative muons in a helium-gas target at 19.4 atm with a 1.5% admixture of Xe. The ground-state hfs splitting Ay was measured through observation of a microwave magnetic-resonance transition at zero magnetic field. After correction for the hfs pressure shift, we determine Ay = 4464.95(6) MHz (13 ppm).
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