Angle-resolved linear polarization of characteristic lines following innershell 2p3/2 photoionization of atoms.

In this paper, we aim to investigate angle-resolved linear polarization of the L α 1 (3 d 5 / 2 → 2 p 3 / 2) , L α 2 (3 d 3 / 2 → 2 p 3 / 2) , and L ℓ (3 s 1 / 2 → 2 p 3 / 2) characteristic lines following innershell 2 p 3 / 2 photoionization of selected neutral atoms with closed subshells by unpolarized or linearly polarized ionizing light within the framework of the density-matrix theory. To this aim, a relativistic single-configuration Dirac–Hartree–Fock approximation and the electric dipole approximation of the radiation fields are used to calculate the 2 p 3 / 2 photoionization amplitudes of those atoms, the alignment parameter of the photoionized 2 p 3 / 2 - 1 hole state, and thus the angle-resolved linear polarization of the characteristic lines. It is found that the angle-resolved linear polarization of the L α 1 , 2 and L ℓ lines behaves very differently for different polarization cases of the ionizing light under consideration. In addition, at given ionizing photon energies the L α 1 line is found to be the least linearly polarized for all different ionizing polarization cases, whereas the linear polarization of both the L α 2 and L ℓ lines is much stronger and, actually, rather close to each other despite always having opposite polarization signs. As the nuclear charge and the ionizing photon energy increase, moreover, each of these lines becomes more and more linearly polarized, respectively. Linear polarization of the L α 1 (top panels), L α 2 (middle), and L ℓ (bottom) lines following innershell 2 p 3 / 2 photoionization of Ba (black solid lines), Yb (red dashed lines), Hg (blue dotted lines), and Rn (green dash–dotted lines) atoms by linearly polarized ionizing γ light with P γ = 1 , as functions of the emission angle θ 0 . Results are given for two different ionizing photon energies of 1.1 (left panels) and 4.0 (right) times their respective 2 p 3 / 2 ionization thresholds. [ABSTRACT FROM AUTHOR]