A gyromagnetic resonance spectrometer employing a spinning sample in a magnetic field, the spinning sample being affixed to a gas driven turbine which is supported by a gas bearing. Means are provided for firmly holding and centering the sample at more than one axial position thereby aligning the sample tube with the turbine axis irrespective of variations in sample tube diameter and straightness.
An air bearing sample spinner for use in an NMR probe has a first air bearing established between frusto-conical mating surfaces of rotor and stator to provide levitation and rotation. A cylindrical portion projects from the rotor into a similar coaxial cylindrical portion of the stator where a journal bearing is provided for centering of the rotor in the stator housing.
The invention concerns an NMR sample holder for NMR samples with a short sample tube of constant diameter which is clamped in a largely gas-tight fashion and with a movable plunger and a rotor. The inventive device increases flexibility compared to conventional sample holders, reduces the vapor volume over the sample liquid in the sample tube and prevents deviations from precise orientation. The invention also concerns a method for simple and safe exchange of the sample tube thereby drastically minimizing loss through breakage.
Apparatus for rotating a test tube in an NMR device which allows sufficient frictional force to be applied to the test tube to rotate it at a desired speed and which allows the test tube to be inserted in and removed from the NMR device while the motor is rotating.
A nuclear magnetic resonance line broadened by an inhomogeneous magnetic field can be narrowed by rotating the sample. This, however, produces rotational side bands having a frequency equal to the frequency of a main signal plus/minus integer multiples of the speed of rotation. The generation of such spurious rotational side bands is avoided by varying the speed of rotation of the sample within a predetermined range of speeds. The lower limit of said range should be high enough to provide for narrowing the nuclear magnetic resonance lines by rotating the sample.
A method for spin imaging in solids using nuclear magnetic resonance (NMR) spectroscopy. The invention includes the steps of rotating the sample about an axis which makes a particular angle with the NMR static external magnetic field, rotating a magnetic field gradient with a spatial distribution which is related to the sample spinning axis synchronously with the sample, collecting the data while performing a solid state NMR line narrowing step, and changing the phase relation between the sample rotation and the field gradient rotation on a step-by-step basis to map out an image of the object.
