Fitting First Order Quadrupolar MAS spinning sideband patterns...

 Example :  2D MAS spectrum of Methiodine fitted to 1st order  
 Example :  23Na MAS spectrum of Sodium Nitrate NaNO3  

Quadrupolar tensor definition :
  • principal values are sorted |Vyy|<=|Vxx|<=|Vzz| note that Vxx and Vyy have signs opposite to that of Vzz - usually NMR is not sign sensitive for EFG
  • Vzz+Vxx+Vyy=0
  • etaQ is the anisotropy of the Quadrupolar tensor etaQ=Vyy-Vxx/Vzz  with 0<=EtaQ<=1
  • and thus Vxx=1/2 (-EtaQ-1)Vzz  and Vyy=1/2 (EtaQ-1)Vzz

Under construction - Construction en cours....
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