A Systematic Study On 2p -> 3d Radiative Opacity Of Lowly Charged Cu Plasmas

The L-shell radiative opacity of lowly charged Cu plasmas is investigated using a detailed level accounting method. The transmission spectra are compared with a recent experiment at similar to 16 eV and 0.005 g/cm(3), and good agreement is observed. For a systematic study, radiative opacities caused by 2p -> 3d transitions at temperatures of 10-35 eV and densities of 0.001-0.1 g/cm(3) are calculated. The dominant ionization stages are lowly charged ones with an open M-shell at such plasma conditions. The result shows that charge state distribution and radiative opacities are very sensitive to temperature. The two strongest absorption peaks of 2p(3/2) -> 3d(5/2) and 2p(1/2) -> 3d(3/2) caused by relativistic orbital splitting are well separated at temperatures lower than 25 eV, whereas they are mixed together to form a broadband structure at higher temperatures.