K-alpha Emission Spectra from Non-Equilibrium
Verne L. Jacobs, V. Decaux, P. Beiersdorfer
Naval Research Laboratory, Code 6390
4555 Overlook Avenue, S. W.
Washington, D. C. 20375
K-alpha X-ray emission spectra from highly charged Fe ions
have been theoretically predicted using a detailed and systematic
spectral model. Account has been taken of the fundamental atomic
radiative-emission processes associated with inner-shell electron
collisional excitation and ionization, as well as dielectronic
recombination. Particular emphasis has been directed at extreme
non-equilibrium or transient-ionization conditions, which can
occur in astrophysical and tokamak plasmas. Good agreement has
been found in comparisons with spectral observations on the EBIT-II
electron beam ion trap at the Lawrence Livermore National Laboratory.
We have identified spectral features that can serve as diagnostics
of the electron density, the line-formation mechanism, and the
This work has been supported by NASA, ONR, and DOE.