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We have measured ¹⁰Be{:}⁹$Be isotope shifts in the $¹S$ and $¹D$ Rydberg series by resonance-ionization mass spectrometry. Pronounced interference of exchange and correlation contributions to the isotope shift is observed in the $¹D$ series, reflecting strong interaction of 2snd and 2pnp channels. The finite-mass correction to the ionization energy of $¹⁰Be$ is inferred to be 270±{}40 MHz.
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Wen et al. (1988) studied this question.
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