An atomic physicist who compiles detailed reference data for alkali chemical atoms, including rubidium-87. His tables and derivations connect measured transition frequencies, hyperfine structure, Zeeman shifts and transition strengths to calculations used in laser cooling and precision spectroscopy. For example, the Breit-Rabi formula and the rubidium-87 clock transition data let an experimenter estimate how a residual magnetic field shifts a frequency reference.[ref]
Rubidium 87 D Line Data by Daniel A. Steck. Sections on hyperfine structure and magnetic fields, especially equations (26)–(29) and clock-transition magnetic data
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