Abstract
This is a review of coal study by means of Electron Spin Resonance (ESR).
First of all, principle and apparatus of ESR are explained. Different kinds of coal and optical microstructure of coal (such as vitrinite, exinite and micrinite etc.) are measured by ESR.
Recently, samples under heating are measured by ESR. A maker of ESR is used and discussed the changes of spectrogram of the maker . The oxidation and liquefaction process of coal are discussed by the data of ESR.
ESR has to use the application of coal reaction process (for example, carboniza tion and liquefaction process).
Chemical structure of coal is also related to the ESR, so it is necessary to study chemical structure of coal by means of new chemical analyzers.
