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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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A precision waveguide system for the measurement of complex permittivity of lossy liquids and solid tissues in the frequency range 29 GHz to 90 GHz-II. The liquid system for 90 GHz; high-frequency
A W-band waveguide system is described which enables the complex permittivity of high-loss liquids to be measured accurately at a spot frequency of 90 GHz. Mechanical restrictions are overcome byExpand
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Anomalous temperature dependence ofD andT2 for dilute solutions of3He in solid4He
Results of measurements of the spin diffusion coefficientD and NMR relaxation timesT1,T2, and T1p are presented for a range of fractional3He concentrations 1 × 10−4≤x3≤2.5 × 10−3 in solid4He at molarExpand
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The 3He nuclear Zeeman maser
A 3He nuclear Zeeman maser is fully described. Macroscopic equations of motion for the magnetisation in the maser cell are derived from exact solutions of Schrodinger's equation and solved byExpand
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Cryogenic GaAs FET amplifiers and their use in NMR detection
The noise properties of GaAs FET devices have been measured in the frequency range 0.2–20 MHz at temperatures 300, 77, and 4.2 K. Significant reduction in all contributions to noise parameters wasExpand
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High-performance UHF SQUID magnetometer.
We describe a lumped-component stabilized point contact SQUID magnetometer, biased at 430 MHz and utilizing a cooled (4.2 K) GaAs FET preamplifier. The system incorporateds a full-bandwidth (5-10Expand
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Nuclear magnetic relaxation of3He gas. I. Pure3He
Longitudinal relaxation timesT1 have been measured in3He gas, using pulsed NMR, for number densities between 3 × 1023 and 6 × 1025 spins m−3 and temperatures between 0.6 and 15 K. Relaxation takesExpand
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Longitudinal Spin Relaxation inHe3Gas at 4.2 K
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Theory of the He 3 Impurity "Gas" in Solid He 4
The nuclear-magnetic-resonance properties of dilute He/sup 3/ impurities in solid He/sup 4/ are analyzed on the basis of ''gaslike'' motions using a model Hamiltonian whose only parameters are theExpand
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