Sideband suppression

Total reflection X-ray fluorescence spectrometry, 26 435-437 Total sideband suppression (TOSS) technique, 23 741 Total site pinch analysis, 20 751 Total solids flux, in thickener design and scale-up, 22 58... 

Z. Song, O. N. Antzutkin, X. Feng and M. H. Levitt, Sideband suppression in magic-angle spinning NMR by a sequence of 5 it pulses. Sol. Stat. Nucl. Magn. Reson., 1993, 2, 143-146. 

Fig. 14. Pulse sequence of the 5-ir-pulse experiment used in the pseudo-twodimensional spinning-sideband-suppression experiment. All pulses in the observe channel are ir pulses. The constant delay T must be a multiple of the rotor period T, but not 3t,. (Reproduced from Gan " with permission.)...

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... 

Cogwheel phase-cycling schemes were applied by Ivchenko et al. to sideband suppression and sideband separation experiments in solid state NMR. It has been shown that cogwheel phase cycles lead to the elimination of most pulse imperfection effects, while using far fewer experimental signal acquisitions than conventional phase-cycling methods. 

FIGURE 4.11 (A) Normalized fluorescence emission spectra of 1,4-diethynylbenzene (dotted line) and the PPB-containing composite materials of Cu-MAL and Cu-MSN catalysts (dashed and solid lines, respectively) after 56 h of polymerization, (B). C CPMAS spectra of (a) structurally aligned PPB polymer catalyzed by Cu-MSN, (b) PPB polymer synthesized with Cu-MAL, and (c) bulk PPB. The spectra were measured at room temperature, using 4680 scans, 10 s intervals, sample rotation rate of 5 kHz, contact time of 2 ms, CW H decoupling at 70 kHz, and sideband suppression (TOSS). (Figure modified from Reference 29.)... 

Double-Sideband Suppressed-Carrier (DSB-SC) Demodulation Errors... 

The receiver for the synchronous demodulation of double-sideband suppressed-carrier (DSB-SC) waves is shown in Fig. 20.49. In general, it is easy to correct the effect of attenuation or amplitude errors through amplification, filtering, or other processing in the receiver. It is more difficult to correct the effect of phase or frequency errors. 

The receiver for the demodulation of single-sideband suppressed-carrier (SSB-SC) signals is similar to the receiver for DSB-SC signals shown in Fig. 20.49. The local carrier is the same as for the DSB-SC signal, but the received signal is given by... 

Sideband suppression An amplitude modulation technique wherein one of the AM sidebands is deliberately suppressed, usually to conserve bandwidth. 

Figure 10.6 Top Palmitic acid nicotinamide heterodimer formed in the 1 1 co-crystal (Cambridge Structural Database (CSD) ref code JEMDIP), bottom CP-HETCOR spectrum of palmitic acid nicotinamide 1 1 co-crystal. ID H MAS (Vf = 35 kEQz) and CP-TOSS (Cross Polarization-TOtal Sideband Suppression) (Vr = 8 kBz) spectra are shown as projections (adapted from Vogt et ai, ref. 43 copyright 2008 American Chemical Society).

DSB-SC-AM Double Sideband Suppressed Carrier AM Includes digital schemes... 

Figure 8 VT C CP MAS NMR spectrum with spinning sideband suppression of PBLA in the solid state at various temperatures dashed line, ap helix form, light solid line, col helix form and bold solid line, p sheet form. Reproduced with permission of American Chemical Society from Akieda T, Mimura H, Kuroki S, Kurosu H and Ando I (1992) Macromolecules 25 5794.

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