Integers sample applications

Figure 14 shows representative 3QMAS spectra obtained with the application of FAM-II schemes on a variety of samples having half-integer quadrupolar spins-1, 2,5, and. ... 

Fig. 2. Pulse sequence of the rotary resonance recoupling experiment (R ) where the amplitude of u>2 matches an integer multiple of Wr. Here we have assumed a spin system with additional presence of H spins in the sample, hence the pulse sequence includes (ramped) cross polarization H— S and H decoupling during acquisition. This assumption will be made throughout as this represents the most typical circumstance. However, replacing CP by direct single-pulse Si excitation and omitting the H decoupling, the R pulse sequence and all sequences discussed in the following are also applicable to (Si, S2) spin systems in the absence of H spins.

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