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A caveat concerning ‘ultra‐high‐resolution nmr.’ effects of magnetic field induced alignment
Author(s) -
Bastiaan E. W.,
Bulthuis J.,
MacLean C.
Publication year - 1986
Publication title -
magnetic resonance in chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.483
H-Index - 72
eISSN - 1097-458X
pISSN - 0749-1581
DOI - 10.1002/mrc.1260240819
Subject(s) - chemistry , anisotropy , resolution (logic) , nmr spectra database , nuclear magnetic resonance , dipole , spectrometer , magnetic field , field (mathematics) , orientation (vector space) , nuclear magnetic resonance spectroscopy , molecule , spectral line , optics , stereochemistry , physics , organic chemistry , geometry , mathematics , quantum mechanics , artificial intelligence , computer science , pure mathematics , astronomy
Line positions in high‐resolution NMR spectra may be affected by dipolar couplings and anisotropic shift contributions, which arise from the partial orientation of the molecules by the magnetic field of the spectrometer. It is shown that, depending on the system studied, these effects can be larger than 0.01 Hz at moderate fields ( ca 7 × 10 4 G), and should therefore be considered when claiming accuracies of 10mHz or better.