Near-coincident K-line and K-edge energies as ionization diagnostics for some high atomic number plasmas

For some high atomic number atoms, the energy of the K-edge is tens of eVs higher than the K-line energy of another atom, so that a few eV increase in the line's energy results in a decreasing transmission of the x-ray through a filter of the matching material. The transmission of cold iridium&...

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Bibliographic Details
Published in:Physics of plasmas 2012-10, Vol.19 (10)
Main Authors: Pereira, N. R., Weber, B. V., Phipps, D. G., Schumer, J. W., Seely, J. F., Carroll, J. J., Vanhoy, J. R., Słabkowska, K., Polasik, M.
Format: Article
Language:English
Subjects:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
ATOMIC AND MOLECULAR PHYSICS
ATOMIC NUMBER
Atomic properties
ENERGY DENSITY
Energy transmission
Exploration
FILTERS
IONIZATION
IRIDIUM
K SHELL
KEV RANGE
LUTETIUM
Nuclear power generation
PLASMA
Plasmas
SPECTRA
TRANSMISSION
X RADIATION
YTTERBIUM
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Summary:For some high atomic number atoms, the energy of the K-edge is tens of eVs higher than the K-line energy of another atom, so that a few eV increase in the line's energy results in a decreasing transmission of the x-ray through a filter of the matching material. The transmission of cold iridium's ≃63.287 keV Kα2 line through a lutetium filter is 7% lower when emitted by ionized iridium, consistent with an energy increase of Δε≃10±1 eV associated with the ionization. Likewise, the transmission of the Kβ1 line of ytterbium through a near-coincident K-edge filter changes depending on plasma parameters that should affect the ionization. Systematic exploration of filter-line pairs like these could become a unique tool for diagnostics of suitable high energy density plasmas.
ISSN:1070-664X
1089-7674
DOI:10.1063/1.4759497