Title :
A low field determination of the proton gyromagnetic ratio in water
Author :
Williams, Edwin R. ; Jones, George R., Jr. ; Ye, Sheng ; Liu, Ruimin ; Sasaki, Hitoshi ; Olsen, P. Thomas ; Phillips, William D. ; Layer, Howard P.
Author_Institution :
NBS, Gaithersburg, MD, USA
fDate :
4/1/1989 12:00:00 AM
Abstract :
The proton gyromagnetic ratio in H2O is measured by the low-field method. γ´p(low)=2.67513376×108 s-1 T-1 (0.11 p.p.m.), leads to a value of the fine structure constant of α-1=137.0359840 (0.037 ppm) and a value for the quantized Hall resistance in SI units of RH=25812.80460 Ω (0.037 p.p.m.). To achieve this result, the dimensions of a 2.1-m solenoid were measured with an accuracy of 0.04 μm, and the NMR (nuclear magnetic resonance) frequency of a water sample was measured in the field of the solenoid
Keywords :
constants; molecular fine structure; nuclear magnetic resonance; quantum Hall effect; solenoids; water; H2O; Josephson effect; NMR; SI units; dimensions; fine structure constant; low-field method; nuclear magnetic resonance; proton gyromagnetic ratio; quantized Hall resistance; quantum electrodynamics; solenoid; water; Current measurement; Frequency measurement; Gyromagnetism; Magnetic field measurement; NIST; Nuclear magnetic resonance; Protons; Quantum mechanics; Solenoids; Testing;
Journal_Title :
Instrumentation and Measurement, IEEE Transactions on
