Magnetic field gradient calibration

Selected Examples. - Pulsed magnetic field gradient (PFG) NMR is today a routine method for the determination of self-diffusion coefficients. However, a remaining goal is the improvement of the precision of the method. The best procedure for the determination of accurate diffusion coefficients by PFG NMR is a calibration with a sample of precisely known D value. Thus Holz et al presented temperature-dependent self-diffusion coefficients of water and six selected molecular liquids. The gained accurate self-diffusion data are suited for an elaborate check of theoretical approaches in the physics of molecular liquids. Price et al examined the translational diffusion... 

Since n = 0, 1, 2, 3,..., the left-hand side of this equation equals 0, 3, 8, 15,.... All that remains is to determine y this can be done from measurement of the applied magnetic field and the length of the sample experiencing the field gradient, but simplest is to calibrate the apparatus using a standard material. 

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