Can you discover unknown elements by calculating their spectra?

Posted on 2025-12-02

Can you discover unknown elements by calculating their spectra?

Years ago I had a discussion with Saul Pwanson about the islands of stability and wondered, can I discover an unknown element by calculating its spectra and pointing a telescope at distant stars?

I asked some smart people I know and they said, ‘Yes and…’.

They said I’d need a basis set and a density function calibrated for those elements. They also said problem setup would be a large amount of work, and then a very large amount of CPU and memory to answer the problem.

They suggested I also look at the selection rule.

A related and disheartening discovery was the furious disagreements in publications titled Undecidability of the spectral gap. What’s up with that?

The math is beyond me, I wouldn’t even know where to start.

If the math isn’t beyond you, try it out and tell me how it goes?