A HIGH-PRESSURE NMR PROBEHEAD FOR MEASUREMENTS AT 400 MHZ

A new high-pressure NMR probehead designed for a 400 MHz widebore NMR spectrometer is described. For the first time, the electrical leads of the rf circuit, the tubes for the thermostating liquid and the high-p ressure fluid, as well as the wires of the Pt-100 resistor for tempera ture control, are all fitted at the bottom of the high-pressure vessel . The sample can easily be removed through a top plug, which allows a relatively fast exchange of the sample. A rather simple design leads t o a low-cost construction. The high-pressure vessel and the rf circuit are placed inside a standard probehead jacket, such that the high-pre ssure probehead can be fitted into the superconducting magnet in the s ame way as a commercial probehead.