Abstract
The contribution of lattice vibrations to the infra-red spectrum of diamond in the 2 to 6 μ region has been calculated from the vibrational frequency distribution where second nearest neighbour central forces are taken into account. It is assumed that this absorption is associated with two-phonon processes arising from second-order terms in the electric moment. Certain general selection rules are determined. Most of the details of the observed spectrum are reproduced in the calculated spectrum.

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