Angular distribution of the dielectronic satellite lines from relativistic high-Z ions: Multipole-mixing effects

摘要

The dielectronic recombination of high-Z hydrogenlike ions is studied within the framework of the density matrix theory. Emphasis is placed on the alignment of the doubly excited ions and the non-electric-dipole (E1) contributions to the subsequent characteristic x-ray emission. Multiconfiguration Dirac-Fock calculations have been carried out in order to investigate the multipole mixing effects on the radiative decay of the doubly excited resonances of heliumlike uranium, following the K-LL dielectronic recombination of hydrogenlike U(91+) ions. In particular, the angular distribution of the K alpha(1) hypersatellites is notably modified by the interference between the leading E1 and the magnetic-quadrupole (M2) transitions. The results are compared with measurements and previous computations available.