Measurement of the Proton Moment in Absolute Units

By measuring the absolute value of the magnetic field and the frequency required for nuclear resonance absorption in a water sample, the gyromagnetic ratio of the proton has been determined to be γP=(2.67528±0.00006)×10⁴ sec.^-1 gauss^-1. With this value and Planck's constant the value of the magnetic moment of the proton in absolute units becomes μP=(1.4100±0.0002)×10^-23 dyne cm/gauss.A combination of our result with recent measurements of the proton moment in Bohr magnetons by Gardner and Purcell results in a value of e/m=(1.75890±0.00005)×10⁷ e.m.u. gram^-1.