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A Measurement of the Nuclear Magnetic Moment of the Helium-3 Atom in Terms of that of the Proton
- J. Flowers, B. Petley, M. Richards
- Physics
- 1993
We have measured the ratio of the NMR spin precession frequencies of optically pumped low pressure helium-3 and of protons in water, using free induction decay. This was done by direct substitution…
The Temperature Dependence of the Diamagnetic Shielding Correction for Proton NMR in Water
- B. Petley, R. W. Donaldson
- Physics
- 1984
The fractional frequency shift in the nmr signal from protons in a spherically-shaped pure water sample has been measured directly as -10.36(30) × 10-9 °C-1 over the range 5 °C to 45 °C. A revised…
International Comparison of Dielectric Measurements
Three materials, i.e.,fused silica, glass, and alumina, were selected for comparison based on known or expected homogeneity, isotropy, and stability. Measurements were made by the three Government…
New definition of the metre
- B. Petley
- PhysicsNature
- 2 June 1983
Some of the physical assumptions which are implicit in the proposed new definition of the metre are discussed, including the mass of the photon and the constancy of the fine structure constant.
Time and frequency in fundamental metrology
- B. Petley
- PhysicsProc. IEEE
- 1 July 1991
The author shows that because time and frequency are the most accurately measured physical quantities, it is desirable to tie other physical quantities to time and frequency measurements. A review of…
An optically pumped 3He maser operating at 0.1 T
- J. Flowers, B. Petley, M. Richards
- Physics
- 28 April 1990
The authors describe operation of an 3He Zeeman maser oscillator at 0.1 T, optically pumped with a 4He lamp. The nuclear spin polarisation observed was comparable with a previous system which worked…
Optically pumped /sup 3/He NMR and atomic hydrogen ESR at 0.6 T
- J. Flowers, C. Bickley, P. Josephs-Franks, B. Petley
- Physics
- 1 April 1997
We report the successful observation of high-fields optically pumped nuclear magnetic resonance (NMR) of helium-3 and electron spin resonance (ESR) of atomic hydrogen, both at 0.6 T. Also described…
Optically pumped 3He NMR and atomic hydrogen ESR at 0.6 T
- J. Flowers, C. Bickley, P. Josephs-Franks, B. Petley
- Physics
- 1997
We report the successful observation of high-fields optically pumped nuclear magnetic resonance (NMR) of helium-3 and electron spin resonance (ESR) of atomic hydrogen, both at 0.6 T. Also described…
The Josephson effects
- B. Petley
- Physics
- 1 March 1969
Abstract This article reviews some of the experimental work on the Josephson effects. These effectsoccur in both superconductivity and superfluidity. In superconductivity they are found when two…
A measurement of the Rydberg constant
THE Rydberg constant is of key importance in spectroscopy and, because it may be expressed as the product of several fundamental physical constants, it also plays an important part as an auxiliary…
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