Electric dipole polarization for Xe 6+ ions

CJB PAGAN; JG REYNA ALMANDOS; M. RAINERI; M. GALLARDO

Aguas de Lindóia

Congreso; XXXVI Encontro Nacional de Física da Matteria Condensada; 2013

Electric dipole polarization plays an important role in the study of electronic core polarization effects on atomic spectra. In the case of Xe VI, the active electron polarizes the [Kr]4d105s2 atomic core, modifying electric dipole transition rates, lifetimes and energy levels. In our previous work on Kr V spectra, we used an approximation to take into account core polarization. Core polarizability was calculated by a semi-empirical method which ? to the best of our knowledge ?  was used for the first time. Our method consists in recalculating the atomic structure using Slater parameters adjusted to fit the levels obtained experimentally. This allows us to reproduce the atomic structure obtained in experiment, and to predict unknown levels of the Rydberg series needed to calculate the polarizability by the usual oscillator strength formula. For Xe6+, the only known experimental value is from the work of Wang et al., published in JOSA B, 13(12), 2715. The authors found  a03 using the method proposed by Edlen, by fitting experimental levels belonging to 4d105snl Rydberg series. In our investigation, we found that this series are not enough to find the correct value, since it does not take into account levels with excited 4d electrons, such as [Kr]4d95s2np, and 4d9nf5s2, which have strong E1 transitions to ground state. Using a multiconfigurational approach with 8 even parity and 61 odd configurations including the [Kr] 4d105snp , 4d105pns, 4d95s2np, and 4d9nf5s2 Rydberg series, we obtained a polarizability of  a03 for [Kr]4d105s2 1S0 Xe6+. Using only {the} 4d105snp and 4d105pns series, we found  a03, which is within the experimental deviation from Wang et al., but we find our more complete prediction of  a03 a more reliable value