Abstract
The g-tensor of excess electron centres (H +)(e −) generated at the surface of polycrystalline MgO has been determined by multi-frequency, high-field electron-paramagnetic resonance (EPR) performed at 9.5, 34, 190 and 285 GHz. The A tensor for the interacting 1H was also determined by complementary Q-band electron-nuclear double resonance (ENDOR). Due to the high spectral resolution the anisotropy of the g-tensor could be fully resolved in the powder continuous-wave EPR spectrum. Computer simulation of the experimental data revealed small g-tensor anisotropies: Δ g x = −0.00294, Δ g y = −0.00286, Δ g z = −0.00101, with Δ g i = g i − 2.0023.
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