Abstract
We report on time-resolved absorption line shape measurements of lithiumlike fluorine produced from x-ray heated Teflon foil targets. X-ray emission created by a separate gold target was used as a backlighter. The width of the F VII 2{ital p}-3{ital d} line, which is Stark broadened, is observed to vary in time. This linewidth is used to infer the time-dependent electron density of the plasma when the density falls below 10{sup 21} cm{sup {minus}3}. These measurements agree well with hydrodynamic code calculations of the plasma density.
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