On the Debye Screening and Bremsstrahlung Radiation in Laser-Produced Plasmas with Relativistic and Non-relativistic Cases.

Hot, dense plasmas exhibit screened Coulomb interactions, resulting from the collective effects of correlated many-particle interactions. Many theoretical investigations have been carried out in the past few decades on the plasma screening effects on the electronic structure of atoms and their collision processes due to the importance of Coulomb interaction screening in dense plasmas. In laser-matter interactions energetic electrons undergo scattering, both from atoms and ions, they emit bremsstrahlung radiation. Here we investigate atomic screening effects on non-relativistic and relativistic electron-atom bremsstrahlung radiation using scattering theory and compare it with that of pure coulomb potential. A new scaling for the radiation cross-section and radiated power via bremsstrahlung are derived for a Debye shielding potential (Coulomb potential with screening factor which depends on the Debye length) and compared them to that of pure Coulomb potential. The radiation cross-section and radiation power via bremsstrahlung are found to increase rapidly with increases in Debye length up to certain limit and then becomes mostly saturated for larger lengths while remaining constant for the pure Coulomb potential. These results help to provide correct information about the amount of bremsstrahlung power reduction due to Debye screening effects for different targets.