Abstract
A review is given of what has been learnt about defects in hydrogenated and non-hydrogenated amorphous carbon using the technique of electron paramagnetic resonance (EPR). Firstly, there is a brief description of how the population of defects can be obtained and of the uncertainties and possible errors which may arise. A summary is then presented of the main results obtained so far by EPR—in particular the variation of the spin density and EPR linewidth with changes in structure and composition of a-C and a-C:H. An interpretation of the data is given and suggestions are made about the nature of the defects.
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