Energy Levels of Neutral Copper (Cu I) by National Institute of Standards and Technology (source code)

= Energy Levels of Neutral Copper (Cu I) by National Institute of Standards and Technology
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https://physics.nist.gov/PhysRefData/Handbook/Tables/coppertable5.htm

Cited row: $3d^{10}({}^1S)4s\ {}^2S_{1/2}$ at zero <spectroscopic wavenumber>. The table distinguishes the neutral atom from the closed-shell <copper>(I) ion.