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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
The Review of Scientific Instruments
|November 7, 2012
Summary
Researchers used a lutetium filter to measure iridium K-line energy shifts in plasma. A small energy shift indicated a plasma ionization shift of approximately 10 eV.
Area of Science:
- Atomic Physics
- Plasma Physics
- X-ray Spectroscopy
Background:
- X-ray transmission through filters is highly sensitive to photon energy near the filter's K-edge.
- Specific atom pairs exhibit K-edges and K-line energies with small energy differences, enabling sensitive measurements.
- Lutetium's K-edge is approximately 27 eV above iridium's Kα(2) line energy (63.287 keV for cold Ir).
Purpose of the Study:
- To investigate the potential of using a lutetium filter to detect energy shifts in iridium K-lines emitted from plasma.
- To quantify the ionization shift of iridium in a plasma environment by measuring the change in X-ray intensity.
Main Methods:
- Utilized a lutetium (Lu) filter positioned to interact with X-rays emitted from an iridium (Ir) plasma.
- Measured the intensity reduction of the iridium Kα(2) line passing through the Lu filter.
- Calculated the energy shift (Δε) based on the observed intensity change and the known energy difference between the Ir Kα(2) line and the Lu K-edge.
Main Results:
- A lutetium filter reduced the intensity of the iridium Kα(2) line by approximately 10% when emitted from plasma.
- This intensity reduction corresponds to an ionization shift (Δε) of approximately 10 ± 1 eV for iridium in the plasma.
Conclusions:
- A lutetium filter is effective in detecting small energy shifts of iridium K-lines caused by plasma ionization.
- The method provides a sensitive diagnostic tool for measuring plasma ionization shifts in the order of 10 eV.
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