Photostimulated exoemission from the surface of magnesia

Photostimulated exoemission (PSE) from magnesia was studied along with the effect of the adsorption of active gases (H₂, O₂, CO₂, and water vapors) on the intensity and kinetics of the emission decay. Based on the literature data, it was shown that PSE was excited from the local surface centers including a pair of low-coordinated ions Mg_1c²⁺-O_1c²⁻ and V_s hole centers, which were also active centers of photosorption and photocatalytic oxidation of methane and some other hydrocarbons.