Mas probehead with a thermally insulated sample chamber

Abstract

An MAS probehead () positioned in a magnet bore () includes a sample chamber () with a stator () for receiving a rotor and an RF coil that radiates RF pulses into and/or receives RF signals from an NMR sample (). A temperature-control apparatus guides gas at a first variable temperature Tinto the sample chamber and through the stator during an NMR measurement, and guides a pressurized gas stream at a second variable temperature Taround the sample chamber. The sample chamber is surrounded by an encapsulation device (), at least in the azimuthal direction around the axis of the magnet bore and counter to the flow direction of the pressurized gas, and is oriented to provide an air gap (') between the sample chamber and the magnet bore. This prevents dissipation of the gas temperature to outer parts of the probehead, and yields larger NMR measurement temperature ranges.