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Abstract
A new type of nitrogen-related center in natural diamond labeled NU1 is identified as a 〈100〉 split interstitial configuration by means of electron paramagnetic resonance (EPR) and photoluminescence (PL) techniques. In PL this center is seen as an electron-vibration system with a zero-phonon line at 485 nm in the crystals containing S1/OK1 and 440.3 nm/N3 centers. NU1 EPR spectra are described by a spin-Hamiltonian with parameters: S = ½, I = 1 and A xx (N) = 22.5 G, A yy (N) = 19.5 G, A zz (N) = 20.55 G, g xx = 2.0043, g yy = 2.0032, g zz = 2.0020. Directions of A zz and g zz coincide and correspond to [001]. The directions of A xx and A yy coincide with those of g xx and g yy and correspond to [110] and [−110], respectively. Analysis of the phonon structure of the NU1 center suggested that titanium can be the second atom together with nitrogen in the structure of a split interstitial.
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