RESONANT CONTRIBUTIONS TO THE $3\rightarrow 2$ LINE EMISSION OF=20
LITHIUM-LIKE IRON
M. F. Gu*, S. M. Kahn*, D. W. Savin*,
P. Beiersdorfer**, G. V. Brown**, D. A. Liedahl**,=20
K. J. Reed**,C. P. Bhalla*** and S. R. Grabbe***
*Columbia Astrophysics Laboratory, Columbia University, New York, NY, U.S.=
A.=20
**Lawrence Livermore National Laboratory, Livermore, CA, U.S.A.
***Department of Physics, Kansas State University, Manhattan, KS, U.S.A.
We measured the dielectronic recombination satellites and resonant=
excitation contributions to the $3\rightarrow 2$ line emission of=
Lithium-like iron. At electron energies just above the excitation=
thresholds, distorted wave approximation underestimates the excitation=
cross sections due to the lack of resonant effects. Recent R-matrix=
calculations are in good agreement with our measurements.