Total suppression of spinning sidebands

The CP step is an essential building block for pulse sequences in solid-state NMR. The easiest ID experiments that are routinely used for characterization of organic, organometallic and hybrid solids are total suppression of spinning sidebands (TOSS), nonquatemary suppression, and so on. 

The pulse sequence used most often for this purpose is the TOSS sequence (total suppression of spinning sidebands. Fig. 3.3.9) [Dixl, Gril]. Before the start of data acquisition at r = ts the spin system is prepared by four 180° pulses at well-defined times... 

Fig. 8 Schematic diagrams for the following pulse sequences (A) single pulse excitation/magic-angle spinning, (B) total suppression of sidebands, and (C) delayed decoupling, or dipolar dephasing.

Abbreviations BCC. body centered cubic DOS. density of states ESR. electron spin resonance HX.AI S, extended X-ray absorption fine structure F CC. face centered cubic (a crystal structure). FID, free induction decay FT, Fourier transform FWHM, full width at half maximum HCP, hexagonal close packed HOMO, highest occupied molecular orbital IR, Infrared or infrared spectroscopy LDOS, local density of states LUMO, lowest unoccupied molecular orbital MAS. magic angle spinning NMR. nuclear magnetic resonance PVP. poly(vinyl pyrrolidone) RF. Radiofrequency RT, room temperature SEDOR, spin echo double resonance Sf, sedor fraction SMSI, strong metal-support interaction TEM. transmission electron microscopy TOSS, total suppression of sidebands. 

A number of ingenious pulse techniques have been devised to eliminate sidebands from high-field spectra so that normal CP/MAS spectra are generated. These are referred to as PASS (Phase Alternated Sideband Suppression) and TOSS (TOtal Sideband Suppression) techniques. An example of the use of TOSS to suppress sidebands from the aromatic carbons in Illinois No. 6 coal is shown in Fig. 3. Two different spinning rates were... 

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