On the Determination of the Signs of Nuclear Magnetic Moments by the Molecular Beam Method of Magnetic Resonance

1939 ◽  
Vol 55 (7) ◽  
pp. 628-630 ◽  
Author(s):  
S. Millman
Keyword(s):  
Magnetic Resonance ◽  
Molecular Beam ◽  
Magnetic Moments ◽  
Nuclear Magnetic Moments ◽  
Beam Method ◽  
Nuclear Magnetic

scholarly journals Multinuclear Magnetic Resonance Study of Sodium Salts in Water Solutions

2019 ◽  
Vol 5 (4) ◽  
pp. 68 ◽  
Author(s):  
Włodzimierz Makulski
Keyword(s):  
Experimental Data ◽  
Magnetic Resonance ◽  
Magnetic Moments ◽  
Resonance Method ◽  
15N Nmr ◽  
Water Solutions ◽  
Nuclear Magnetic Moments ◽  
Shielding Constants ◽  
15N Nmr Spectroscopy ◽  
Nuclear Magnetic

The small amounts of gaseous 3He dissolved in low concentrated water solutions of NaCl, NaNO3 and NaClO4 were prepared and examined by 3He-, 23Na-, 35Cl- and 15N-NMR spectroscopy. This experimental data, along with new theoretical shielding factors, was used to measure the 23Na nuclear magnetic moment against that of helium-3 μ(23Na) = +2.2174997(111) in nuclear magnetons. The standard relationship between NMR frequencies and nuclear magnetic moments of observed nuclei was used. The nuclear magnetic shielding factors of 23Na cation were verified against that of counter ions present in water solutions. Very good agreement between shielding constants σ(3He), σ(23Na+), σ(35Cl‒), σ(35ClO4‒), σ(15NO3‒) in water at infinite dilution and nuclear magnetic moments was observed for all magnetic nuclei. It can be used as a reference nucleus for calculating a few other magnetic moments of different nuclei by the NMR method. An analysis of new and former μ(23Na) experimental data obtained by the atomic beam magnetic resonance method (ABMR) and other NMR measurements shows good replicability of all specified results. The composition of sodium water complexes was discussed in terms of chemical equilibria and NMR shielding scale.

scholarly journals Explorations of Magnetic Properties of Noble Gases: The Past, Present, and Future

2020 ◽  
Vol 6 (4) ◽  
pp. 65
Author(s):  
Włodzimierz Makulski
Keyword(s):  
Magnetic Properties ◽  
Magnetic Resonance ◽  
Noble Gases ◽  
Theoretical Calculations ◽  
Noble Gas ◽  
Magnetic Moments ◽  
Nuclear Magnetic Moments ◽  
Muons And Neutrinos ◽  
History Of ◽  
Nuclear Magnetic

In recent years, we have seen spectacular growth in the experimental and theoretical investigations of magnetic properties of small subatomic particles: electrons, positrons, muons, and neutrinos. However, conventional methods for establishing these properties for atomic nuclei are also in progress, due to new, more sophisticated theoretical achievements and experimental results performed using modern spectroscopic devices. In this review, a brief outline of the history of experiments with nuclear magnetic moments in magnetic fields of noble gases is provided. In particular, nuclear magnetic resonance (NMR) and atomic beam magnetic resonance (ABMR) measurements are included in this text. Various aspects of NMR methodology performed in the gas phase are discussed in detail. The basic achievements of this research are reviewed, and the main features of the methods for the noble gas isotopes: 3He, 21Ne, 83Kr, 129Xe, and 131Xe are clarified. A comprehensive description of short lived isotopes of argon (Ar) and radon (Rn) measurements is included. Remarks on the theoretical calculations and future experimental intentions of nuclear magnetic moments of noble gases are also provided.

scholarly journals Ядерное магнитное экранирование в многозарядных ионах

2021 ◽  
Vol 129 (12) ◽  
pp. 1477
Author(s):  
А.М. Волчкова ◽  
Д.А. Глазов ◽  
В.М. Шабаев
Keyword(s):  
Magnetic Moments ◽  
Hyperfine Interactions ◽  
Accurate Determination ◽  
Field Method ◽  
Magnetic Shielding ◽  
Nuclear Magnetic Moments ◽  
Relativistic Approach ◽  
Finite Field Method ◽  
Nuclear Magnetic

The nuclear magnetic shielding is considered within the fully relativistic approach for the ground state of H-, Li-, and B-like ions in the range Z=32-92. The interelectronic interaction is evaluated to the first order of the perturbation theory in Li- and B-like ions. The calculations are based on the finite-field method. The numerical solution of the Dirac equation with the magnetic-field and hyperfine interactions included within the dual-kinetic-balance method is employed. The nuclear magnetic shielding constant is an important ingredient for accurate determination of the nuclear magnetic moments from the high-precision g-factor measurements.

Some recent applications of the use of paramagnetic centres to probe biological systems using nuclear magnetic resonance

1977 ◽  
Vol 10 (4) ◽  
pp. 421-484 ◽  
Author(s):  
Arabella T. Morris ◽  
Raymond A. Dwek
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Magnetic Moments ◽  
Biological Systems ◽  
Nuclear Magnetic Moments ◽  
Paramagnetic Probes ◽  
Unpaired Electrons ◽  
Paramagnetic Centres ◽  
Nuclear Magnetic

The explosion of the use of paramagnetic probes to study biological problems by nuclear magnetic resonance (n.m.r.) stems from the large and easily quantifiable perturbations they produce. The main reason for these perturbations is that the magnetic moments of unpaired electrons are about 103 times greater than nuclear magnetic moments and consequently they generate much greater local fields.Such fields can give rise to large shifts in nuclear resonances; but if these fields fluctuate at the appropriate frequencies they will also cause very efficient relaxation in the nuclear resonances. It is possible to select probes that result mainly in one of these parameters being perturbed so that the terms shift and relaxation probe are now well established in the literature.

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