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The NIST Atomic Spectra Database is an excellent resource for finding the energy levels of atoms and the transitions between them, and (together with the DLMF) is a good candidate for the number-one useful resource they don't tell you about in undergrad.

Given how useful it is, I was hoping it would also contain data about the hyperfine structure over the periodic table (necessarily broken down by isotope as well as ionization state), but I tried to slice it several ways and no hyperfine structures fell out.

I am looking for a table or web-accessible database where I can plug in an isotope and it will tell me the hyperfine level structure of each electronic state (at least the ground state; if possible also the more important excited electronic states) along with total spins and so on. Given how often BEC people need to go looking for a trappable atom with hyperfine ground-state spin $F=$(some predetermined number), I imagine there's at least some reasonably well-established bit of literature infrastructure to do this, but I can't seem to find it. Where should I look?

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    $\begingroup$ I saw this question on the front page and thought "oh, the NIST database." But the first sentence is asking for more than that. Then I thought, "I bet @EmilioPisanty would know the answer," but got down to the author of the question. I am pretty sure that I have gotten some hyperfine information from somewhere in NIST's voluminous collection of web-accessible data, but it's been a long time since I've dug through. $\endgroup$
    – rob
    Commented Aug 16, 2023 at 17:00
  • $\begingroup$ Unfortunately I think no such useful reference exists, but I hope to be proven wrong $\endgroup$
    – KF Gauss
    Commented Aug 20, 2023 at 13:35
  • $\begingroup$ @KFGauss I would hope for such a reference as well, but, alas, I fear that there is as yet no unified place for this information. $\endgroup$ Commented Aug 24, 2023 at 11:22
  • $\begingroup$ @rob Thanks for the kind words! $\endgroup$ Commented Aug 24, 2023 at 11:22

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As far as I am aware, astronomers are the biggest users of hyperfine structure parameters.

Knowing this, I found the Vienna Atomic Line Database (VALD3). Here is a list of their hyperfine data. This seems to be primarily a line database and not a level database. I think you will have to know which element and transition you are looking for and be comfortable with reading configuration and term symbols.

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