arXiv subjects
Publications and source records attributed to M. C. Martins.
Theoretical transition energies and probabilities for He-, Li- and Be-like Praseodymium ions are calculated in the framework of the multi-configuration Dirac-Fock method (MCDF), including QED corrections. These calculated values are compared to recent experimental data obtained in the Livermore SuperEBIT electron beam ion trap facility.
The most important processes for the creation of S12+ to S14+ ions excited states from the ground configurations of S9+ to S14+ ions in an electron cyclotron resonance ion source, leading to the emission of K X-ray lines, are studied. Theoretical values for inner-shell excitation and ionization cross sections, including double KL and triple KLL ionization, transition probabilities and energies for the deexcitation processes, are calculated in the framework of the multi-configuration Dirac-Fock method. With reasonable assumptions about the electron energy distribution, a theoretical K$α$ X-ray spectrum is obtained, which is compared to recent experimental data.
Energies and transition probabilities of K$β$ hypersatellite lines are computed using the Dirac-Fock model for several values of $Z$ throughout the periodic table. The influence of the Breit interaction on the energy shifts from the corresponding diagram lines and on the K$β\_{1}^{\rm h}$/K$β\_{3}^{\rm h}$ intensity ratio is evaluated. The widths of the double-K hole levels are calculated for Al and Sc. The results are compared to experiment and to other theoretical calculations.
L$β\_2$ X-ray satellite spectra of tungsten and gold are calculated using the Multi-Configuration Dirac-Fock energies and compared with recent experimental data. New calculations of L$\_1$-L$\_3$M$\_5$ Coster-Kronig transition energies for tungsten are presented, confirming the origin of the L$β\_2$ visible satellites reported by two experimental groups. We found the value 5.09 eV for the average energy of the L$\_1$-L$\_3$M$\_5$ Coster-Kronig transition in tungsten. A detailed calculation of the L$β\_2$ and L$β\_{15}$ satellite spectra was performed for gold.
Energies of two-electron one-photon transitions from initial double K-hole states were computed using the Dirac-Fock model. The transition energies of competing processes, the K$α$ hypersatellites, were also computed. The results are compared to experiment and to other theoretical calculations.