diffusion-ordered spectroscopy high-resolution diffusion-ordered spectroscopy high-resolution DOSY HR-DOSY A type of NMR spectroscopy using pulsed-field gradients where the rate of decay of NMR signals in each component of a sample mixture is measured across a series of experiments. The rate of signal decay is proportional to the diffusion coefficient for each component. The diffusion coefficient for each peak is measured and this information is used to construct a 2D spectrum. high resolution DOSY CHMO:0000790 high resolution diffusion-ordered spectroscopy