Abstract
In CVD deposited diamond films a Raman mode at approximately 1150 cm −1 is often used as a simple criterion for a nano-crystalline diamond phase in the sample. Since this line shows a dispersion of approximately 25 cm −1/eV it was suggested to originate from trans-polyacetylene segments in the grain boundaries. We calculated the position of the ν ̄ 1 mode of trans-polyacetylene using a vibronic model for resonance Raman scattering and compared the results with the measured positions of the 1150 cm −1 mode for diamond samples on different substrates and found a very good agreement. Within the calculations we were able to estimate the mean number of uninterrupted conjugated bonds in the chains. Additionally, the response for the 1150 and 1480 cm −1 lines turned out to be unstable vs. exposure to elevated temperatures which is further evidence for its origin from conjugated segments.
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