Low-power STMAS – breaking through the limit of large quadrupolar interactions in high-resolution solid-state NMR spectroscopy

Abstract

An STMAS NMR experiment requiring significantly lower rf fields is presented, allowing acquisition of high-resolution spectra for half-integer spins regardless of the magnitude of their quadrupolar interaction. The experiment relies on frequency crossings induced by sample spinning during 'long' rf pulses to coherently cover the satellite-transitions efficiently.