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It's been known how to calculate the Zeeman effect. However how to calculate the transition energy between $^2P$ to $^2S$ and $^2D$ to $^2S$ for sodium($Z=11$)? ($^2P$ here meant term symbol ignored the LS coupling thus $J$ does not degenerate, and suppose no external magnetic field and thus no Zeeman.) where $^2P$ to $^2S$ was known around $589nm$?

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    $\begingroup$ It takes quantum chemistry to do that. $\endgroup$ – my2cts Mar 18 at 15:38

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