Measurement of the O2O3O4 and O3O4O5 Super Coster-Kronig Rates in Tungsten via Asymmetric Diffraction Spectrometry

Published

March 7, 2014

Author(s)

Lawrence T. Hudson, John F. Seely, Jack L. Glover, Yuri Ralchenko, Nino R. Pereira, Uri Feldman

Abstract

The tungsten Lγ transitions between 11 keV and 12 keV and Kα transitions from 57 keV to 60 keV were produced by a laboratory electron-bombarded x-ray source and simultaneously recorded with high-resolution by using multiple diffraction planes of the same quartz crystal operating in Cauchois transmission geometry. The W Kα transitions were dispersed by the (502) planes, which were perpendicular to the crystal entrance surface, and by the (602), (702), and (804) planes which were rotated with respect to the (502) planes by angles up to 4.8 degrees. The W Lγ transitions were dispersed by the (201) planes rotated from the (502) planes by 4.01 degrees. The spectra from the five planes were simultaneously recorded on image plate detectors, and spectra were also recorded by scanning solid-state electronic detectors with narrow slits across the spectral lines. The metrology of the L and K shell spectra diffracted from multiple quartz planes enabled the detailed analysis of the detector spatial resolution and accurate measurement of the instrumental broadening produced by the various quartz diffraction planes. The W Lγ spectra had the highest instrumental resolving power, 1800, permitting for the first time the resolution of the blended Lγ4’ (L1O2) and Lγ4 (L1O3) transitions. After subtracting the instrumental and detector contributions to the line widths, the remainder was assigned to the natural line widths. The measured widths of the O2 and O3 levels were 2.9 eV and 1.9 eV, respectively, and based on atomic code calculations these widths are attributed to the O2O3O4 and O3O4O5 super Coster-Kronig processes. This work demonstrates the ability to simultaneously record high resolution (

Citation

Journal of Physics B-Atomic Molecular and Optical Physics

Pub Type

Journals

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Keywords

Super Coster-Kronig Rates, Tungsten, x-ray spectrometry

Citation

Hudson, L. , Seely, J. , Glover, J. , Ralchenko, Y. , Pereira, N. and Feldman, U. (2014), Measurement of the O2O3O4 and O3O4O5 Super Coster-Kronig Rates in Tungsten via Asymmetric Diffraction Spectrometry, Journal of Physics B-Atomic Molecular and Optical Physics, [online], https://doi.org/10.1088/0953-4075/47/11/115004 (Accessed April 19, 2024)