X-Ray Crystal Spectroscopy of a Theta-Pinch Plasma in the Region 15-25Å
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Abstract
A new synthetic crystal, potassium acid phthalate (KAP), has a spacing between crystal planes, $2d=26.6$ \AA{}. The use of this crystal in a Bragg crystal spectrometer has permitted measurement of the Scylla I x-ray spectrum from 15 to 25 \AA{}, a region inaccessible with the beryl crystal previously used. The principal features of the observed spectrum in this region are the lines of O vii and O viii arising from oxygen contamination of the discharge by material from the ceramic discharge tube. Six lines of the resonance series of O vii are observed, including both $1{s}^{2}^{1}S_{0}\ensuremath{-}1s2p^{1}P_{1}$ and $1{s}^{2}^{1}S_{0}\ensuremath{-}1s2p^{3}P_{1}$. The first members of the Lyman series of O viii are also observed. Measurements of Doppler widths of the lines of O vii and O viii yield an oxygen-ion Doppler temperature of 9.3\ifmmode\pm\else\textpm\fi{}2.8 keV. These measurements, when combined with those previously made on other ion species, show that the ions of the plasma are not in collisional equilibrium.
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