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The emission intensity of diamond samples containing nitrogen-vacancy centresare measured as a function of magnetic field along a <111> direction forvarious temperatures. At low temperatures the responses are sample and stressdependent and can be modeled in terms of the previous understanding of the 3Eexcited state fine structure which is strain dependent. At room temperature theresponses are largely sample and stress independent, and modeling involvesinvoking a strain independent excited state with a single zero field splittingof 1.42 GHz. The change in behaviour is attributed to a temperature dependentaveraging process over the components of the excited state orbital doublet. Itdecouples orbit and spin and at high temperature the spin levels becomeindependent of any orbit splitting. Thus the models can be reconciled and theparameters for low and high temperatures are shown to be consistent.

Time-averaging within the excited state of the nitrogen-vacancy centre in diamond