Theoretical investigation of orbital alignment of x-ray-ionized atoms in exotic electronic configurations

We theoretically study orbital alignment in x-ray-ionized atoms and ions, based on improved electronic-structure calculations starting from the Hartree-Fock-Slater model. employ first-order many-body perturbation theory to improve show that use of first-order-corrected energies yields significantly better transition than originally obtained. The enable us also compute individual state-to-state cross sections rates and, thus, investigate induced by linearly polarized x rays. To explore transiently formed ions after photoionization, we discuss parameters ratios state-resolved photoionization for initially neutral argon two exotic electronic configurations may be during x-ray multiphoton ionization dynamics free-electron lasers. present how is affected Auger-Meitner decay demonstrate it evolves a sequence one decay. Our work establishes step toward investigation atomic driven high-intensity