Shielding Effects in Covalent Halogen Compounds

Conference paper
Part of the NMR Basic Principles and Progress Grundlagen und Fortschritte book series (NMR, volume 12)


Let us consider a molecule fixed in space and containing a magnetic nucleus. If the molecule is exposed to a uniform static magnetic field \( {\bar B_O} \) this will act on the electrons to induce a small additional field \( \mathop {\rm{B}}\limits^{\rm{\_}} \prime \). At the position of our magnetic nucleus the local field, \( {{\bar B}_{loc}} \), will be
$$ {{\bar B}_{loc}} = {\bar B_O}{\rm{ + }}\mathop {\rm{B}}\limits^{\rm{\_}} \prime $$
Experimental evidence as well as theoretical arguments indicate that for reasonably moderate magnetic fields (cf. discussion by Ramsay [143]) the induced field is proportional to \( {\bar B_O} \) but not necessarily aligned parallel to it and one may write
$$ \mathop {\rm{B}}\limits^{\rm{\_}} \prime {\rm{ = - \tilde \sigma }}{\bar B_O} $$
where \( {\rm{\tilde \sigma }} \) is a second rank tensor — the nuclear shielding tensor.


Atomic Orbital Valence Shell Quadrupole Coupling Constant Alkali Halide Crystal Paramagnetic Contribution 
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Copyright information

© Springer-Verlag Berlin Heidelberg 1976

Authors and Affiliations

  1. 1.Department of Physical Chemistry Chemical CentreUniversity of LundLundSweden

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