Homonuclear dipolar decoupling schemes for fast MAS

We present two one-dimensional methods that allow direct observation of highly resolved 1H spectra in solid-state NMR. The methods, which work mainly at 30-35 kHz MAS speeds, are very robust and efficient. In addition, they present very few false resonances. The windowed smooth amplitude-modulated (wSAM) version has a potential to work at ultra-fast MAS provided the electronics is capable to define the pulse-shape in a smooth way, without any pulse transients.