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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
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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 GovernmentExpand
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New definition of the metre
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.
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Josephson noise thermometry with HTS devices
We suggest that the very promising performance of Josephson devices based on high temperature superconductors (HTS) can provide new areas of application for a novel form of primary thermometer whichExpand
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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
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Time and frequency in fundamental metrology
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 ofExpand
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A saturated absorption spectroscopy measurement of the Rydberg constant
A tuneable dye laser saturated absorption measurement of three of the fine-structure components of the Balmer alpha line of atomic hydrogen in a gas discharge yields a value of 10, 973, 731.513(85)Expand
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A precise omegatron measurement of μp/μ N
The value obtained for the proton magnetic moment in nuclear magnetons was 2.7927748+or-0.0000020 (0.72 ppm) without the diamagnetic shielding correction. Measurements were made with a quadrupoleExpand
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The atomic units, the kilogram and the other proposed changes to the SI
The close relationship between the SI units incorporating the proposed changes of Mills et al and the atomic system of units is discussed. It is shown that when the definition of the second is takenExpand
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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
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