Abstract
LiCl and LiNO3 water solutions in the presence of small amounts of 3-helium have been investigated by means of multinuclear resonance spectroscopy. The resulting concentration dependences of the 3He, 6,7Li+, 14NO3− and 35Cl− resonance radiofrequencies are reported in the infinite limit. This data along with new theoretical corrections of shielding lithium ions was analyzed by a known NMR relationship method. Consequently, the nuclear magnetic moments of 6Li and 7Li were established against that of the helium-3 dipole moment: μ(6Li) = +0.8220457(50)μN and μ(7Li) = +3.256418(20)μN. The new results were shown to be very close to the previously obtained values of the (ABMR) atomic beam magnetic resonance method. This experiment proves that our helium method is well suited for establishing dipole moments from NMR measurements performed in water solutions. This technique is especially valuable when gaseous substances of the needed element are not available. All shielding constants of species present in water solutions are consistent with new nuclear magnetic moments and these taken as a reference. Both techniques—NMR and ABMR—give practically the same results provided that all shielding corrections are properly made.
Highlights
The electromagnetic moments of nuclei, dipole and quadrupole, have great significance for theory of nuclear structure
Lithium has NMR spectroscopy based on two different nuclei
Water solutions of lithium salts seem to be ideal for precise measurements
Summary
The electromagnetic moments of nuclei, dipole and quadrupole, have great significance for theory of nuclear structure. The method relies on the accurate measurements of two frequencies for different nuclei placed in one sample at the same magnetic field One of these frequencies should belong to the nucleus with a well-known magnetic moment and can be taken as a reference. The spectacular growth of quantum theoretical methods in this field provided new impetus for improving existing data Several such works were performed in the Laboratory of NMR Spectroscopy at the University of Warsaw. Water solutions of common salts of lithium were applied—LiCl and LiNO3 in the presence of dissolved 3He atoms This procedure has several advantages: very narrow NMR signals, good sensitivity and well-known shielding parameters of different ions in liquid samples
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