AI Article Synopsis
- The study presents the first experimental results on the refractive index of yttrium in the extreme-ultraviolet and soft x-ray ranges, indicating both dispersive (delta) and absorptive (beta) components.
- Transmittance measurements were carried out on pure yttrium films at the Advanced Light Source to determine the absorptive part, while the dispersive part was calculated using the Kramers-Kronig transformation.
- The new data on yttrium's refractive index shows improved consistency with theoretical sum rules and reveals previously hidden fine structure near critical absorption edges, which is relevant for yttrium-based multilayer mirrors.
Article Abstract
The first experimental results to our knowledge on the refractive index n = 1 - delta + ibeta of yttrium in the extreme-ultraviolet and soft x-ray energy ranges are discussed. To determine the absorptive part beta, transmittance measurements were performed on pure yttrium films in the 50-1300-eV energy region at beamline 6.3.2 of the Advanced Light Source. The dispersive part delta was then calculated from the absorption results by means of the Kramers-Kronig transformation. Compared with prior tabulated values, the new wet of data for the refractive index of yttrium is in better agreement with the sum rules and contains previously unresolved fine structure information in the regions of the M2,3 and M4,5 absorption edges, where yttrium-based multilayer mirrors operate.
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| http://dx.doi.org/10.1364/ao.41.007309 | DOI Listing |
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