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Helium spectrum

Jacques
in Quantum Theory

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With the Rydberg equation we can calculate spectrum line of hydrogen.

Is there a simple equation like that for Helium and other elements ?

Does the Rydberg equation cover all hydrogene spectrum line ?

Thanks

The Rydberg Eq. covers all bound states of Hydrogen, and cases of ionized

atoms with only one electron left. It does not apply if there is more than one electron present. It would also start to fail a bit, due to relativity, if Z got too large.

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