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Creators/Authors contains: "Kay, E M"

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  1. ; ; (, Physical Review A)
    We use saturated absorption spectroscopy to study neutral ^9Be atoms produced in a dc discharge lamp. Previous measurements of the 2s2p^1P^o_1 state energy were limited in precision due to overlapping hyperfine structure. In this work, we apply a 400 G magnetic field, which splits the magnetic sublevels creating a spectral feature near the center-of-gravity energy of the state. We determine the transition frequency from the ground state to be 1276080105.5(1.2) MHz, corresponding to a center-of-gravity energy of 42565.45058(4) cm−1. This result is a factor of 30 more precise than the previous best measurement and constitutes the most precise determination of an excited-state energy in a four-electron system to date. As theoretical methods advance, this result will enable stringent tests of quantum electrodynamics in four-electron systems. 
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