Excitation of Some Nitrogen-Like Ions: Calculations and Comparison with Measurements

Electronic energies of one-electron excited states 1s22s22p2ns 4P, 1s22s22p2ns 2P, 1s22s22p2np 4S, 1s22s22p2np 2S, 1s22s22p2np 4P, 1s22s22p2np 2P, 1s22s22p2np 4D, 1s22s22p2np 2D, 1s22s22p2nd 4P, 1s22s22p2nd 2P, 1s22s22p2nd 4D, 1s22s22p2nd 2D, 1s22s22p2nd 4F, 1s22s22p2nd 2F of nitrogen-like ions with n=3-12 and Z=7-50 have been calculated. For all the aforementioned electronic configurations, fine-structure levels have been determined for states with different total momentum J. The comparison of theoretical results with the available experimental data shows that theory and measurements agree well. In particular, relative accuracy of 10-4 has been achieved in the electronic energy of N-like at Z > 10, while the typical deviation in the calculated fine-structure levels from experimental data is in the order of 10-2

Долговечность полимеров в переменном электрическом поле

An explanation of the difference in the electrical properties of polymers in the DC and AC electric fields is proposed. Energy release during recombination of electrons and holes injected into a polymer dielectric is considered as a factor accelerating the processes of electric aging of these dielectrics in an AC field. It is shown that nonradiative relaxation of electron excited states causes breaks of bonds in macromolecules and formation of free radicals. Due to the lower ionization energy of free radicals (compared to the original molecules), the rate of charge accumulation in the polymer dielectric increases, which leads to a decrease in its durability in an AC field compared to the durability of polymers in a DC field.

X-ray laser lines in nickel-like erbium

Energy levels of 249 excited levels in nickel-like erbium are calculated using the 3s23p63d10 as a ground state and the single electron excited states from n = 3 to n = 4, 5 orbitals, calculations have been performed using FAC code (Gu. Astrophys. J. 582, 1241 (2003). doi:10.1086/344745 ). The populations are calculated over electron densities from 1020 to 1023 cm−3 and electron temperatures 1/2, 3/4 of the ionization potential of Ni-like Er. The gain coefficients of the transitions are calculated.