No phonon lineshapes and crystal strain fields in diamonds

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Abstract
Many no phonon lines in diamond are found to have the spectral intensity distribution i(v)=a(b+(v-v0)2)-2 in the limit of low temperature. This distribution lies midway between the lorentzian and gaussian shapes and is close to a voigt function with lorentzian and gaussian components l/g=0.5. Detailed measurements on the width, energy and shape of the 503 nm line produced by the electron irradiation and annealing of a series of type i diamonds have shown that the width and exact energy are partly dependent on the concentration of impurity nitrogen. This, and other evidence, suggests the nitrogen is predominantly in the form of small aggregates, rather than platelets. With this assumption, the width, exact energy and lineshape may be closely related to the strain field produced by the nitrogen.

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