Can you cite experiments where, in some excited states of a hydrogen atom, magnetic moment significantly differs from Bohr's magneton was detected? Correction for magnetic moment of nucleus is insignificant. Only experimental data, not theoretical forecasts. Starting from the experiments of Stern and Gerlach, it seems that only moment of one magneton was detected, I could not find other information. But maybe I'm wrong and didn't search well? For single-electron ions, I would also like to get acquainted with the data of experiments, for example, for He+. There is a lot of information on nuclei on the Internet, but somehow there is no information on hydrogen-like ions.