Abstract
Five natural gem diamonds which included type IA, IB and IIA specimens, have been investigated by ion beam spectrochemical analysis (IBSCA) to determine the total hydrogen impurity concentration in the diamonds. These data were compared with that obtained from other “conventional” techniques such as infrared and ultraviolet absorption spectroscopy, electron spin resonance and transmission electron microscopy (TEM). IBSCA indicated that all the specimens appeared to contain ∼ 1 at. % of hydrogen contrary to the infrared evidence. The highest hydrogen concentration was recorded by a type IB specimen which contained small (∼ 3nm) bubbles. The hydrogen concentration did not correlate with any defect within the specimens, for example the {100} planar faults, and appeared to be a general impurity. No evidence was found to suggest that inclusions were responsible for the impurity.
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