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

Volume

38

Issue

2

fYear

1989

fDate

4/1/1989 12:00:00 AM

Firstpage

233

Lastpage

237

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 R_H=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;

fLanguage

English

Journal_Title

Instrumentation and Measurement, IEEE Transactions on

Publisher

ieee

ISSN

0018-9456

Type

jour

DOI

10.1109/19.192278

Filename

192278