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An introduction to Solid State NMR and its Interactions

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The secular approximation<br />

High Field <strong>NMR</strong>:<br />

B 0<br />

≫ B loc<br />

Perturbation Expansion of the <strong>NMR</strong> interactions<br />

H Z<br />

≫ H inter.<br />

H inter.<br />

≈ H 1 CS<br />

H 1 Q<br />

H 2 Q<br />

H 1 D<br />

H 1 J<br />

...<br />

Keeping terms invariant under rotation around B 0<br />

B 0<br />

A XX<br />

A zz<br />

<br />

A YY<br />

A ZZ

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