Abstract
It is demonstrated that the use of fast amplitude-modulated RF pulse trains with constant (FAM-I) and incremented pulse durations (SW–FAM) leads to considerable sensitivity enhancement for the central-transition signal (via spin population transfer from the satellite transitions) for solid-state NMR spectra of titanium, 47 Ti (I= 5 2 ) and 49 Ti (I= 7 2 ) . For the magic-angle spinning spectra of TiO 2 and BaTiO 3, the intensity of the 49 Ti central-transition line was more than doubled compared to simple Hahn-echo acquisition, while for the static case, enhancement factors of 1.6 (TiO 2) and 1.8 (BaTiO 3) were obtained. No lineshape distortions are observed in either MAS or static spectra of both compounds. Employment of the FAM and SW–FAM sequences should be useful in the routine acquisition of 47,49 Ti spectra, as the NMR signal can be detected much faster.
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