Our recent measurement of the hydrogen 2S-8D transition appeared in PRL.  From this, we were able to extract a new value for the proton charge radius which shows a 3-σ discrepancy with the CODATA 2018 value.  https://doi.org/10.1103/PhysRevLett.128.023001

An extraction of the Rydberg constant from our recent measurement as compared with other hydrogen transitions.