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. 2018 Apr 4;557(7703):71–75. doi: 10.1038/s41586-018-0017-2

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© Macmillan Publishers Ltd., part of Springer Nature 2018

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Fig. 2 — Calculated energies (E; for hydrogen) of the hyperfine sublevels of the 1 S (bottom) and 2 S (top) states are plotted against magnetic field strength. The centroid energy difference E_1S–2S = 2.4661 × 10¹⁵ Hz has been suppressed on the vertical axis. The vertical black arrow indicates the two-photon laser transition probed here (frequency f_d–d); the red arrow illustrates the microwave transition used to remove the 1S_c state atoms (frequency f_c–b).