Abstract

We have made a new measurement of the magnetic moment of protons in a spherical sample of water in units of the Bohr magneton. This ratio, μP′/μB,is needed in many atomic physics experiments for converting into atomic units the value of a magnetic field measured as an NMR frequency. It is used in the determination of α from 2e/h experiments and in the evaluation of other constants such as γp and mp/me. Also, by comparing μp′/μB to μp/μB, the free proton moment in Bohr magnetons(1), one obtains the absolute value of the diamagnetic shielding factor for protons in water. Shielding factors of different molecules can be intercompared to very high precision, so that the present result permits absolute determination of the shielding factor for any molecule.

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