The high energy vibrations of hexagonal sheets of BC, BC₃, and BC₇ are calculated and compared with graphene. A high energy ``G'' vibration (at 1559 cm^-1 in graphene) is similar in the B-C structures. Another high energy ``D'' vibration (around 1350 cm^-1) is a mode not found in graphene and is attributed to a vibration that is especially sensitive to B concentration.
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Lowther et al. (2009) studied this question.
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