ABSTRACT
This chapter gives a brief discussion of wideline Nuclear magnetic resonance (NMR) of coals and humic materials. It discusses the various factors which contribute to linewidths, the information that can be deduced from the shape and width of an NMR line, and ways to obtain undistorted NMR lines when they are “wide”. Unlike lines from most other forms of spectroscopy, widths of NMR lines are caused by several different mechanisms which are dependent on the particular experimental conditions under which the measurements are being made. In pulse NMR moderately high power radio-frequency pulses are used to excite the nuclei, which then emit a time varying signal. The deadtime depends on the frequency of the NMR spectrometer; everything else being equal, it is longer for lower frequencies.
