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Relativistic calculation of the unpolarized triple-differential cross section and the polarization correlation of the electron bremsstrahlung from atoms

A formulation for calculating the polarization correlations of the triple-differential cross section for incident electrons and emitted photons in the electron bremsstrahlung from atoms using the relativistic partial-wave method is given. With the partial-wave method we calculate the unpolarized triple-differential cross section and the polarization correlation C200 of the bremsstrahlung from atoms with atomic number Z = 1, 47, and 79 for incident electrons of kinetic energies T1 = 180 and 300 keV. Our partial-wave results are compared with the partial-wave results of Shaffer et al (Shaffer C D, Tong X-M and Pratt R H 1996 Phys. Rev. A 53 4158) the partial-wave results of Keller and Dreizler (Keller S and Dreizler R M 1997 J. Phys. B: At. Mol. Opt. Phys. 30 3257), and other approximate and experimental results.