ИСТИНА

The formation and decay of double-core-hole (DCH) states of the neon ion irradiated by an intense electromagnetic x-ray field are studied theoretically. Detailed calculations of the partial decays and probabilities of shake-ups at the atomic and ionic ionization stages are presented. The angular distribution of photoelectrons corresponding to various residual ionic states are calculated. Dynamical competition between single-core-hole (SCH) state decay and excitation is analyzed and pulse parameters corresponding to various dynamical regimes are found.