Energy transfer aspects in a capacitor-transfer-type discharge excimer laser with automatic preionization (API) have been studied to improve the laser efficiency. Detailed measurements on the discharge and output characteristics of the XeCllaser show that efficient energy transfer from the storage capacitor to the discharge capacitor is essential for improvement in the overall efficiency. The circuit analysis based on the measurements suggests that the API discharge excimer laser could be operated with an electrical efficiency of about 4%. The overall efficiencies of2.9, 2.8, and 1.3% have been obtained with the XeCl, KrF, and ArF lasers, respectively.
TiO2 (Vis-TiO2) thin films absorbing UV and visible light in regions of 250-600nm have
been successfully developed by applying a radio-frequency (RF) magnetron sputtering deposition
method. SIMS depth profiles of Vis-TiO2 revealed that the O/Ti ratio gradually decreases from the
top surface (O/Ti ratio : 2.00 ± 0.01) to the inside (1.93 ± 0.01). This unique declined O/Ti
composition (anisotropic structure) may be the origin of the significant perturbation in the electronic
structure of Vis-TiO2, enabling the absorption of visible light and their high photocatalytic
performance under visible light irradiation. In fact, it was found that the separate evolution of H2 and
O2 from water could be successfully achieved under visible light or solar light irradiation by applying
these thin film photocatalysts in an H-type glass container separating the two aqueous solutions by a
TiO2 thin film and proton-exchange membrane, having H2 evolution from Pt side and O2 evolution
from TiO2 thin film side, respectively.
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