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An introduction to NMR
Author(s) -
Proctor W. G.
Publication year - 1971
Publication title -
journal of the american oil chemists' society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.512
H-Index - 117
eISSN - 1558-9331
pISSN - 0003-021X
DOI - 10.1007/bf02673230
Subject(s) - magnetic field , compass , spin (aerodynamics) , physics , atomic physics , magnetic moment , field (mathematics) , angular momentum , energy (signal processing) , resonance (particle physics) , nuclear magnetic resonance , line (geometry) , condensed matter physics , quantum mechanics , geometry , thermodynamics , mathematics , pure mathematics
Nuclear magentic resonance (NMR) is a physical method for exploring the magnetic environment of the atomic nuclei of the atoms in a molecule. The substance is placed in a strong magnetic field and the nuclei take on an orientation with respect to this field. The reason for this is that the nuclei have angular momentum (spin) and, being charged, have magnetic moments like small compass needles. By subtle radio‐frequency (r‐f) techniques the nuclei are simply made to reorient (resonate) in this field. The reorientation involves a change of energy, which is supplied by the r‐f quantum, hv. The frequency of resonance is therefore proportional to the reorienta tion energy and hence to the magnetic field in which the nucleus is found. As in other forms of spectro‐scopy, the width of the absorption line depends on a