Second under magic angle spinning condition

Theoretically, the expected NMR linewidth I/tiT 2, under CP-MAS or DD-MAS NMR conditions, depends strongly on either the coherent frequency of the proton decoupling or the magic angle spinning, when they interfere with the frequency of the corresponding incoherent random fluctuation motion, if any. In such cases, the overall relaxation rate 1/J2 can be dominantly determined by the following second or third terms instead of the first term of the static component by... 

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