NUCLEAR-MAGNETIC-RESONANCE PROBE FOR SUPERCRITICAL WATER AND AQUEOUS-SOLUTIONS

A nuclear magnetic resonance (NMR) probe for high pressure, high tempe rature studies is presented. While applicable to many physical systems , the device is optimized for the study of the physics and chemistry o f supercritical water and its solutions. The design is modular and is particularly simple, using readily available parts and materials. A ne w approach is presented for elimination of the magnetic field from the heater currents. The probe has been used to 600 degrees C and 400 bar . The rf performance is quite good; the NMR linewidth is about 0.1 ppm full width at half-height at any pressure and temperature. (C) 1997 A merican Institute of Physics.