Laboratory Studies of the Fe K Shell Emission
- Lawrence Livermore National Laboratory
- 7000 East Ave, L-260
- Livermore, CA 94550
The importance of the Fe K shell emission for astrophysics
has been evident for many years. Data have typically been obtained
with rather low-resolution solid-state detectors such as those
used on ASCA or presently on Chandra. Next year's
launch of ASTRO-E2 is expected to provide Fe K shell spectra
with high-resolution (E/DE 1000).
This will enable real spectroscopy of the Fe K lines and their
use as diagnostics of such source parameters as temperature,
ionization equilibrium, and electron density. In order to analyze
Fe K shell data spectral models must be both complete and accurate.
The Fe K shell spectrum has been studied in much detail on tokamaks
and the Livermore electron beam ion traps. Laboratory data now
include accurate line lists and identifications, even of several
forbidden lines, electron-ion collision cross sections, innershell
ionization phenomena and cross sections, dielectronic recombination
resonance strengths, spectra produced by charge exchange recombination,
electron beam polarization effects, resonance excitation, and
radiative cascade contributions. These measurements have provided
an assessment of the completeness and accuracy of the atomic
data, and we will present results of such measurements.
This work was performed under the auspices
of the U.S. DOE by UC-LLNL under contract W-7405-Eng-48 and support
by NASA's Astronomy and Physics Research and Analysis Program
under contract S-06553-G.