The characteristic transition of the NV- centre at 637 nmis between 3A2 and 3E triplet states. There are also intermediate 1A1 and 1E singlet states, and the infrared transition at 1042 nmbetween these singlets is studied here using uniaxial stress. The stress shift and splitting parameters are determined, and the physical interaction giving rise to the parameters is considered within the accepted electronic model of the centre. It is established that this interaction for the infrared transition is due to a modification of electronelectron Coulomb repulsion interaction. This is in contrast to the visible 637 nm transition where shifts and splittings arise from modification to the one-electron Coulomb interaction. It is also established that a dynamic JahnTeller interaction is associated with the singlet 1E state, which gives rise to a vibronic level 115 cm-1 above the 1E electronic state. Arguments associated with this level are used to provide experimental confirmation that the 1A1 is the upper singlet level and 1E is the lower singlet level.
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- colour centre
- infrared emission
- spin polarization
- uniaxial stress