| Popis: |
Three different ways of creating a broad energy band X-ray beam have been tested for studying electric field induced changes in Bragg intensities. The basic idea behind all three techniques (graded multi-layer, bent Laue crystal and filtered white beam) is to try to separate the change in integrated intensity on one side from changes in peak shape and peak position on the other side. All three techniques give a significant increase in data collection speed, as compared to the more standard highly monochromatic method. However, only in the case of bent Laue crystal monochromators could the energy spectrum be made sufficiently flat to give a complete separation of the effects related to structural changes from the effects related to peak shifts and peak deformations. |
