Foam Z-pinch experiments have recently been performed on SATURN to stu
dy issues associated with the initiation, acceleration, and stagnation
phases of the pinch. Time-integrated x-ray crystal spectra have been
recorded from experiments with 5 mg/cc Si aerogel loads and 10 mg/cc a
gar loads. In this article, we describe results from collisional-radia
tive equilibrium calculations performed to analyze the Si, Na, and S K
-shell emission observed in the spectra. Particular attention is paid
to density and opacity effects on intensity ratios involving He-alpha,
He intercombination, and Li-like satellite lines. (C) 1997 American I
nstitute of Physics.