Effects of electron correlation and the Breit interaction on one- and two-electron one-photon transitions in double K hole states of He-like ions (10 ≤ Z ≤ 47)*

Abstract

The x-ray energies and transition rates associated with single and double electron radiative transitions from the double K hole state 2s2p to the 1s2s and 1s 2 configurations of 11 He-like ions (10 ≤ Z ≤ 47) are evaluated using the fully relativistic multi-configuration Dirac-Fock method. An appropriate electron correlation model is constructed with the aid of the active space method, which allows the electron correlation effects to be studied efficiently. The contributions of electron correlation and the Breit interaction to the transition properties are analyzed in detail. It is found that the two-electron one-photon (TEOP) transition is correlation sensitive. The Breit interaction and electron correlation both contribute significantly to the radiative transition properties of the double K hole state of He-like ions. Good agreement between the present calculation and previous work is achieved. The calculated data will be helpful to future investigations on double K hole decay processes of He-like ions.

Isotope shift of the 2s 2S1/2 → 2p 2P1/2,3/2 transitions of Li-like Ca ions*

“…The relativistic MCDHF method is one of the most widely used methods for study on the complex atomic structure and properties research. [32][33][34][35][36][37][38] The GRASP family codes are based on the MCDHF method which developed in the past 40 years. [39][40][41][42][43][44] The present work is performed by newly developed GRASP2K [43] and RIS4 package.…”

Theoretical study of the enhancement of saturable absorption of Kr under x-ray free-electron laser

“…[27] When compared with the experimental values, there were some differences between the Kr 1+ , Kr 2+ , and Kr 4+ . The differences are possibly due to the relatively few physical processes considered, such as single photon multi-ionization, double Auger decay, and resonant excitation to the parameter fitting, [20,28,29] which can provide better agreement to the experimental results. [26] and another theoretical result.…”

X-ray emission for Ar11+ ions impacting on various targets in the collisions near the Bohr velocity*

“…The inner-shell process of projectile and target atoms can be observed simultaneously. Due to the limitation of experimental conditions, although a few works have been carried out to study separately the x-ray emission from projectile or target atoms, [31][32][33][34][35][36][37][38] the research investigating simultaneously the two phenomena is rare. It is also unclear for the correlation between the x-ray emission from projectile and target atoms, which respect to the distribution of energy loss between the projectile and target atoms.…”