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024 7 _ |a 10.1140/epjd/s10053-021-00268-4
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024 7 _ |a 1434-6060
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024 7 _ |a 1434-6079
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037 _ _ |a FZJ-2021-03731
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100 1 _ |a Engels, Ralf
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245 _ _ |a Direct observation of transitions between quantum states with energy differences below 10 neV employing a Sona unit
260 _ _ |a Heidelberg
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520 _ _ |a The direct access to atomic transitions between close by quantum states employing standard spectroscopic methods is often limited by the size of the necessary radio-frequency cavities. Here we report on a new tool for fundamental spectroscopy measurements that can overcome this shortcoming. For this, a Sona transition unit was used, i.e., two opposed solenoidal coils that provide an oscillating field in the rest frame of the through-going atomic beam. In this way, we were able to control the induced photon energy down to 10 neV or f∼ MHz. The tuneable parameter is the velocity of the atomic beam. For illustration of the method, we report a measurement of the hyperfine splitting energies between the substates with F=1 and m_F=−1,0,+1 of 2S_1/2 metastable hydrogen atoms as function of a magnetic field.
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