= Daniel A. Steck
{c}
{tag=Physicist}
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.<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]{ref}
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