Abstract
Uniaxial stress measurements were carried out in absorption on the 1.563 eV zero phonon line observed in nickel-grown high pressure and high temperature synthetic diamonds after annealing to 1900 °C. Analysis of the data shows that the line is a transition between an A and a B state at a centre of monoclinic II (C 2) symmetry, with the electric dipole of the transition aligned at approximately 11.5° to the [1 1 0] direction in the (0 0 1) plane. A structure consistent with the data is an interstitial nickel atom with three next-nearest-neighbour nitrogen atoms in a (0 1 0) plane.
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