SAMPLE ROTATION MECHANISM AND METHOD FOR NMR PROBE

摘要

An NMR spectrometer has an air bearing supported turbine comprising a rotor (30) having a frusto-conical shaped member (34) and a cylindrical portion (33). A stator (35) houses said rotor and has a tapered portion (36) for receiving said frusto-conical rotor portion and a cylindrical portion for receiving the cylindrical portion, together with a first set of jets (39) in the tapered portion for levitating the rotor and a second set of jets (41) in the cylindrical portion for maintaining alignment of the rotor axis with the axis of the cylindrical portion. The rotor has means (34 min ) for deriving rotational motion from at least one of said set of jets and means (46, 46 min ) are provided for maintaining different gas pressures at the respective set of jets.