Abstract
The resonance dynamics due to the simultaneous excitation of twoΔmF=±1 transitions within the three magnetic sublevels of theF=1 state in the atomic hydrogen ground state have been investigated for resonance excitation within the magnetic six pole state selected atomic beam of a hydrogen maser system. Both transitions were excited with equal strength by means of a single rf-excitation and by the Ramsey technique with two separated rf-fields. The associated changes in the atomic beam energy level population probabilities were measured by monitoring the hydrogen maser oscillation amplitude. Sufficiently strong excitations of bothΔmF=± 1 transitions result in a state selected, but unpolarized atomic beam, which offers the advantage to reduce considerably the sensitivity of hydrogen maser frequency on coherently excitedΔmF=±1 transitions within the maser interaction region. The theoretical analysis showed, that in contrast to other atomic beam preparation methods for hydrogen maser operation with unpolarized atoms, the saturation of atomic beams resonances influences only the maser amplitude but not the maser frequency.
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