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≃10 eV ionization shift in Ir Kα2 from a near-coincident Lu K-edge
N R Pereira1, B V Weber, D Phipps
1Ecopulse, Inc, P.O. Box 528, Springfield, Virginia 22150, USA. ninorpereira@gmail.com
Abstract:
Close to an x-ray filter's K-edge the transmission depends strongly on the photon energy. For a few atom pairs, the K-edge of one is only a few tens of eV higher than a K-line energy of another, so that a small change in the line's energy becomes a measurable change in intensity behind such a matching filter. Lutetium's K-edge is ≃27 eV above iridium's Kα(2) line, ≃63.287 keV for cold Ir. A Lu filter reduces this line's intensity by ≃10 % when it is emitted by a plasma, indicating an ionization shift Δε≃10±1 eV.
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