• Publications
  • Influence
A Measurement of the Nuclear Magnetic Moment of the Helium-3 Atom in Terms of that of the Proton
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 substitutionExpand
  • 57
  • 2
The Route to Atomic and Quantum Standards
  • J. Flowers
  • Physics, Medicine
  • Science
  • 19 November 2004
Over the past half-century, there has been a shift away from standards based on particular artifacts toward those based on physical effects, the most stable being based on quantum properties ofExpand
  • 61
  • 1
Progress in our knowledge of the fundamental constants of physics
The measurements of quantities providing information on the values of the fundamental physical constants bring together a wide variety of measurements in very different parts of physics in a uniqueExpand
  • 40
  • 1
Constants, units and standards
Our knowledge of the Universe depends on our ability to make measurements. Measurement is essentially a comparison process. In order to make comparisons valid for different positions in space andExpand
  • 2
  • 1
Quantum electrodynamics: A chink in the armour?
A measurement of the size of the proton, obtained using spectroscopy of an exotic atomic system, yields a result of unprecedented accuracy — but in disagreement with values obtained by previousExpand
  • 12
  • 1
The NPL Rydberg Constant Experiment
TLDR
We describe the characterization of the apparatus that has been constructed at the National Physical Laboratory for absolute optical frequency measurements of a number of two-photon 2S-nS,D transitions in the hydrogen atom. Expand
  • 11
Hydrogenic systems, frequency standards and fundamental constants
Hydrogenic (two-body) systems are the only atomic systems for which uncertainties in calculations of the energy levels approach the current state of the art in frequency measurement. This articleExpand
  • 8
Optically pumped 3He NMR and atomic hydrogen ESR at 0.6 T
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 describedExpand
  • 3
Optically pumped /sup 3/He NMR and atomic hydrogen ESR at 0.6 T
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 describedExpand
  • 5
Correcting high precision pulsed NMR flux density measurements for asymmetries in the lineshape
Flux density measurements at the highest accuracy obtained via nuclear magnetic resonance differ from the average flux density over the sample. Spatial variations of the flux density cause line-shapeExpand
  • 4
...
1
2
3
4
...