Results

**1 - 7**of**7**### Fechnica] Notes NMR Measurements of the Knight Shift in Conducting PbO

"... According to the quantum mechanical model, nu-clei possessing units of angular momenta and a nonzero magnet ic moment are al lowed only dis-crete or ientat ions in an applied magnet ic field. In the case of the Pb ~7 isotope where the nucleus has a spin of 1/2 units, there are two separate f ield-de ..."

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-de-pendent energy levels. The energy of these levels is given by E~-or v-- y Ho for the transi t ion frequency, v being the frequency, ~ the magnet ic moment, H the value of the magnet ic field, and y the

*gyromag-netic*ratio for a given*nucleus*. By vary ing the applied magnet ic field, H, and### Solid-state 14N NMR of amino acids and polypeptides

"... Amino acids play a vital role as the building blocks of proteins and their arrangement in the polypeptide chain controls protein structure and folding. These systems have been extensively investigated by NMR using 13C and 15N as the probe nuclei. Unfortunately, due to the low natural abundances of t ..."

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. Nitrogen-14 is an integer-spin

*nucleus*(I = 1) with a non-zero electric quadrupole moment (eQ = 20.44 mb) and a low*gyromagnetic*ratio (γ = 1.93 × 107 rad T−1 s−1) [1]. Due to the quadrupolar nature of this*nucleus*, it couples to the surrounding electric field gradient (EFG), which is dependent upon### (a) Nuclear Spin Interactions in Molecules. It has become clear that high-

"... resolution nuclear-resonance experiments can give a great deal of information relative to the geometrical and electronic structures of molecules. It is believed that all observed spectral structures can be accounted for on the basis of the Hamiltonian- _ = h H ~yi ( I- i) + J.. I. I. i i j>i whe ..."

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>i where H is the applied magnetic field, yi is the

*gyromagnetic*ratio of*nucleus*i, Ii is its spin operator, and 6 and Jij are coupling constants characteristic of the elec-tronic wavefunctions of the molecule. We are attempting to justify the form of this Hamiltonian in intermediate coupling cases### Spin-Wave Contribution to the Nuclear Spin-Lattice Relaxation in Triplet Superconductors

"... We discuss collective spin-wave excitations in triplet superconductors with an easy axis anisotropy for the order parameter. Using a microscopic model for interacting electrons, we estimate the frequency of such excitations in Bechgaard salts and ruthenate superconductors to be 1 and 20 GHz, respec ..."

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temperature dependence of the nuclear spin-lattice relaxation rate (NRR). Bechgaard salts Our starting point is the Moriya relation Here A describes the strength of hyperfine interactions between nuclear spins and conduction electrons, g N is a

*gyromagnetic*ratio of the*nucleus*, g eff is an effective### Pulsed Nuclear Magnetic Resonance 1 Background

"... What we call “nuclear magnetic resonance ” (NMR) was developed simultaneously but independently by Edward Purcell and Felix Bloch in 1946. The experimental method and theoretical interpretation they developed is now called “continuous-wave NMR ” (CWNMR). A different experimental technique, called “p ..."

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. The relationship between these two quantities is where γ is the

*gyromagnetic*ratio. µ = γI, (1) A simple classical calculation would give γ = q/2M, where q is the charge of the*nucleus*and M is its mass. But quantum mechanics requires this dimensionally correct result to be modified. In practice, we specify γ### E.s.r., ENDOR, and Triple Resonance of Fluoro-substituted Fluorenone Ketyls

"... Electron spin resonance (e.s.r.) and electron nuclear double resonance (ENDOR) spectra have been observed from dilute solutions of the radical anions of 1 -, 2-, 3-, and 4-fluoro-and 2,7-difluoro-fluorenone in tetrahydrofuran (THF) at temperatures below -70 "C with sodium as gegenion. For all ..."

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to the values determined for the parent unsubstituted fluorenone and were assigned according to the results of HuckelMcLachlan calculations. Proton ENDOR of radicals in solution has proved to be a valuable spectroscopic technique for the elucidation of electronic structure. Since I9F nuclei have a

*gyromagnetic*### ARTICLE Composite-pulse magnetometry with a solid-state quantum sensor

"... The sensitivity of quantum magnetometer is challenged by control errors and, especially in the solid state, by their short coherence times. Refocusing techniques can overcome these limitations and improve the sensitivity to periodic fields, but they come at the cost of reduced bandwidth and cannot ..."

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-noise-limited magnetic field resolution per unit measurement time where g e (E2.8 MHzG À 1 for NV) is the sensor

*gyromagnetic*ratio and DB is the minimum detectable field. We broke down the total measurement time T into interrogation time t and the dead-time t d required for initialization and readout. In the absence**1 - 7**of

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