= Zeeman shift
{c}
{title2=$\Delta E=g_Fm_F\mu_BB$}
The change of an <energy level> in a <magnetic field>. The displayed weak-field form applies to a <hyperfine level> with magnetic projection $m_F$, when $g_F$ is the corresponding <Landé g-factor>. A transition shift is the difference of the two level shifts divided by <Planck constant>. A <clock transition> can have zero first-order transition shift even when its two individual level slopes are nonzero. For $m_F=0$ <hyperfine levels>, the linear level shift vanishes and quadratic terms remain.
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