Multi-frequency high-field EPR study of (H+)(e−) pairs localized at the surface of polycrystalline MgO

The g-tensor anisotropy of excess electron centres (H+)(e−) generated at the surface of polycrystalline MgO was determined by multi-frequency, high-field electron-paramagnetic resonance (EPR) performed at 9.5, 34, 190 and 285 GHz.