Electron-ion Coulomb bremsstrahlung in strongly coupled plasmas

Bremsstrahlung in electron-ion Coulomb scattering in strongly coupled plasmas is investigated using the classical curved-trajectory method. In strongly coupled plasmas, the electron-ion interaction potential is obtained by using the ion-sphere model potential. The modified hyperbolic-orbit trajectory method is applied to describe the motion of the projectile electron in order to investigate the variation of the differential bremsstrahlung radiation cross section as a function of the impact parameter and ion-sphere radius. The results show that the scaled doubly differential bremsstrahlung radiation cross sections have minima in the small impact-parameter region for soft photon radiation. For hard photon radiation, the minima disappear. The impact parameter corresponding to the minimum position of the bremsstrahlung radiation cross section recedes from the center of the ion core as the ion-sphere radius increases. The radiation cross section is substantially reduced as the radiation energy increases, especially for a large ion-sphere radius.