Abstract
A ΔE–E telescope was used in coincidence to analyse diamond samples by recoil of hydrogen (ERDA) using 4.1 MeV He+. Comparison of the results from silicates with known H-abundances suggested sensitivities of <50 atomic ppm. A slice of type Ib diamond was prepared and implanted with known amounts of hydrogen (1000, 150, 40 and 10 atomic ppm). The analysis of this manufactured standard by ERDA showed that the 1000 and 150 ppm implants were resolvable. The presence of intrinsic hydrogen in the diamond prevented resolution of the lower H implants. A number of diamonds from southern Africa were analysed for their H-content using ERDA and Fourier transform infrared (FTIR) techniques. There was no correlation between the results of both techniques. It was concluded that much of the hydrogen in diamond (typically 100–4000 atomic ppm in the specimens analysed) was not infrared active (i.e. not bonded to C or N in the diamond lattice).
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