Abstract
In order to extend the available photon energy range of the double-crystal monochromator (DXM) to lower energy than that obtainable with beryl crystal, β-alumina crystals (Na2O [Al2O3]11, 2d=22.53 Å) were tested as the monochromator crystal. The intensity and resolution of the monochromatized x ray from the DXM with the β-alumina crystals were compared to those with beryl crystals. The β-alumina crystals cover the energy region from 580 to 1740 eV (Bragg angle 71.5°–18.5°) with an intensity more than ten times higher than that obtained with the beryl crystals. The resolution of a pair of the β-alumina crystals used is estimated to be about 1 eV at 931 eV, which is almost two times wider than that of beryl crystals (0.46 eV).
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