Abstract
Polycrystalline and homoepitaxial diamond films deposited from 12C- and 13C-containing gases have been characterized by Fourier transform IR spectroscopy. We present evidence that some spectral structures in the well-known C-H stretch band around 2850cm−1 omnipresent in polycrystalline films are related to the incorporation of nitrogen. In homoepitaxial diamond films, the isotopic replacement of carbon, hydrogen and nitrogen by 13C, 2H and 15N reveals that a CH centre without nitrogen participation is responsible for a new vibrational absorption band observed at 3123cm−1 in the spectral vicinity of the previously observed 3107cm−1 absorption band in natural diamond. The bond centred position can be excluded for this vibrational transition. In addition, new hydrogen-related electronic transitions have been observed in the near-IR around 7300cm−1.
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