Abstract
The effect of gold on keV x-ray emission from gold-copper (Au–Cu) mix-Z plasma has been experimentally studied. The intensity of the copper L-shell line radiation (λ∼7.8–10.9Å) as well as the integrated keV x-ray yield were observed to decrease sharply with increasing atomic fraction of gold in the mix-Z target. The decrease was observed to be by a factor of ∼2.1 for 0.12 atomic fraction of gold in the Au–Cu mix-Z target with respect to the pure copper target. The results can be explained from physical consideration of the high value of free-bound opacity of gold in the spectral region of the L-shell emission of copper ions and downconversion of the absorbed keV line radiation.
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