| 摘要 |
An NMR system for obtaining high resolution spectroscopic measurements at a selected temperature includes gradient correcting means disposed in proximity to an NMR probe, for imposing desired gradients on the volume occupied by the sample within the probe. A heat exchange gas is impelled through a heat exchanger and then surrounds the sample to bring the sample to the desired temperature. A thermal barrier, inocuous to RF excitation and of relatively low magnetic susceptibility protects the gradient correcting means from drift due to heat exchange with the heat exchanging gas. |
