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X-Ray Spectroscopy to Determine Line Coincidences Between K- and L-Shell Transitions

Published online by Cambridge University Press:  12 April 2016

P.G. Burkhalter ,
D. Newman ,
J.V. Gilfrich ,
D.B. Brown ,
P.D. Rockett ,
G. Charatis ,
C. Hailey ,
D.L. Matthews  and
B. MacGowan
P.G. Burkhalter
Affiliation:
Naval Research Laboratory Washington, DC 20375
D. Newman
Affiliation:
Naval Research Laboratory Washington, DC 20375
J.V. Gilfrich
Affiliation:
Naval Research Laboratory Washington, DC 20375
D.B. Brown
Affiliation:
Naval Research Laboratory Washington, DC 20375
P.D. Rockett
Affiliation:
KMS Fusion, Inc. Ann Arbor, MI 48106
G. Charatis
Affiliation:
KMS Fusion, Inc. Ann Arbor, MI 48106
C. Hailey
Affiliation:
Lawrence Livermore National Laboratory Livermore, CA 94550
D.L. Matthews
Affiliation:
Lawrence Livermore National Laboratory Livermore, CA 94550
B. MacGowan
Affiliation:
Imperial College London, England

Extract

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Accurate wavelengths for highly-ionized L-shell spectra were measured in the 10–16Å region. The purpose being to determine lines in coincidence with L-shell transitions from the elements oxygen, fluorine, and neon. L-shell transitions have been proposed for resonant photopumping of K-shell electrons in these elements to, generate lasing between upper levels in the 40–150 eV region. The current effort improves on and expands the earlier spectroscopic work performed at KMS Fusion, Inc., where possible line coincidences were identified for photoionizing in the 1–3 and 1–4 levels in fluorine. New experimental techniques have led to a wavelength accuracy now believed to be ± 2 mÅ for cases in which adequate calibration lines are available. Exact spectral line matches were found for Mn with the F H,-line at 12.643Å and for both Mn and Cr with the F He line at 14.458Å. The Mn line at 12.643Å has been identified, using ab initio atomic structure calculations, as the 1D2 − 1F3 transition in Be-like Mn XXII. The Mn line emissivity was determined to be 30 MW into 2 steradians for a conversion efficiency of 0.04%. Photopumping with Mn coated gasfilled targets is presently being tried in gain measurement experiments at LLNL.

Type
Session 7. High Density Laboratory Plasmas
Information
International Astronomical Union Colloquium , Volume 86: Eighth International Colloquium on Ultraviolet and X-ray Spectroscopy of Astrophysical and Laboratory Plasmas , 1984 , pp. 255 - 257
Copyright
Copyright © Naval Research Laboratory 1984. Publication courtesy of the Naval Research Laboratory, Washington, DC.

References

1. Hagelstein, P.L., Plasma Physics. 25, 1345 (1983), and “Physics of Short Wavelength Laser Design,” UCRL-53100 (1981).CrossRefGoogle Scholar
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3. Matthews, D.L., et al. (current experiments on Novette).Google Scholar
4. Rockett, P.D., et al. (to be published).Google Scholar
5. Hailey, C., et al. Second Topical Meeting on Laser Techniques in the Extreme Ultraviolet, Mar. 5-7, 1984, Boulder, CO.Google Scholar