Quantitative correlation of infrared absorption with nuclear magnetic resonance measurements of hydrogen content in diamond films

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Abstract
Hydrogen concentrations in polycrystalline diamond films were found to correlate well with the integrated intensity of the CH-stretch region in the infrared (IR) spectrum for films with a total hydrogen content <0.10 at. %. Comparison of IR to nuclear magnetic resonance (NMR) measurements yielded an effective absorption coefficient for the CH-stretch region of 4.3±0.8×103 ℓ mol−1 cm−2, similar to literature values for condensed-phase hydrocarbons. In several films, the dominant stretch modes occur at ∼2850 and 2920 cm−1, typical of CH2 groups. The presence of these modes is accompanied by an increase in the Gaussian linewidth in the NMR spectrum, indicating a decrease in the interproton spacings within the film. In films with higher total hydrogen contents, a simple linear relationship between hydrogen content and intensity in the CH-stretch region is no longer applicable.

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