SCAM-STMAS

Table 5e. The phase table for STMAS and SCAM-STMAS experiments...

Several modifications have been proposed for STMAS. Some were aimed at achieving pure absorption lineshapes such as z-filter ° and phase-modulated shifted-echo schemes.Another modification proposed was to create CT coherences first and detecting the satellite transitions (iSTMAS). ° Perhaps, the most interesting modification involves pure absorption lineshapes with a compensation to the magic-angle misset, the SCAM-STMAS experiment. ... 

Fig. 24. Shifted-echo split- i pulse sequences for (a) STMAS and for (b) SCAM-STMAS which compensates for a mis-set in the magic angle. Also shown are the coherence level diagrams along with an indication of which transition, satellite transition (ST) or central transition (CT), is being tracked by the pulses. The phase-cycle list, (/>i,2,3,(/>4, and (/>rec is given in Table 5e.

Fig. 25. Rb spectra of RbNOa acquired with (a) regular STMAS scheme with very accurate magic-angle setting, (b) regular STMAS scheme with a magic-angle mis-set of 0.07°, (c) SCAM-STMAS scheme with very accurate magic-angle setting, and (d) SCAM-STMAS scheme with a...

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