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Hard x-ray emission in the energy range of 30--300 keV from copper plasmas produced by 100-fs, 806-nm laser pulses at intensities in the range of 10¹⁵-10¹⁶ Wcm^-2 is investigated. We demonstrate that surface roughness of the targets overrides the role of polarization state in the coupling of light to the plasma. We further show that surface roughness has a significant role in enhancing the x-ray emission in the above mentioned energy range.
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Rajeev et al. (2002) studied this question.
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