Quantum effects on the transition bremsstrahlung process in dense semiclassical plasmas

The quantum effects on the transition bremsstrahlung spectrum due to the polarization interaction between the electron and Debye shielding cloud are investigated in dense semiclassical plasmas. The impact parameter analysis with the screened effective pseudopotential taking into account the quantum and plasma screening effects is employed to obtain the bremsstrahlung radiation cross-section as a function of the de Broglie wavelength, Debye radius, photon energy, and projectile energy. The result shows that the quantum effect strongly suppresses the transition bremsstrahlung radiation spectrum in semiclassical plasmas. It is also found that the domain of the bremsstrahlung spectrum in the soft-photon radiation case is greater than the Debye radius. However, the bremsstrahlung domain in the hard-photon radiation case is found to be localized within the Debye sphere. In addition, it is also found that the quantum effects are more important in the maximum region of the bremsstrahlung radiation cross-section. Copyright (C) EPLA, 2010One of the authors (YDJ) gratefully acknowledges Dr M. ROSENBERG for warm hospitality and useful discussions while visiting the University of California, San Diego. This research was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science and Technology (Grant No. 2010-0015910)