Abstract
Amorphous films of MgO prepared by laser evaporation of bulk crystals show anomalous absorption in the region between 5.2 and 9.2 eV. An additional broad absorption band attributable to absorption by O 2− ions in states of low coordination has been observed at 217.5nm (5.7 eV). Amorphous MgO films show no evidence of absorption due to the bulk O 2− exciton at 7.62 eV but do exhibit such a feature when annealed to 800C in air.
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