We have carried out calculations of the polarizabilities of the two-electron positive ions Li + , Be 2+ , B 3+ , C 4+ , N 5+ , and O 6+ interacting with screened Coulomb potentials. Highly accurate correlated exponential wave functions are used to represent correlation effects on the charged particles. The dipole, quadrupole, and octupole polarizabilities for the screening parameters in the range 0-1a −1 0 are reported. Reported results for the unscreened case are comparable with the available results and for the screened case show some interesting behavior with increasing nuclear charge.
We have carried out non-relativistic calculations to investigate the effect of Debye plasmas screening on the doubly excited nonautoionizing 1,3 P e and 1,3 D o states of Li II, Be III, B IV, and C V using highly correlated exponential wave functions within the framework of Ritz variational principle. The 2p 2 3 P e , 2p3p 1 P e , and 2p3d 1,3 D o states energies, and wavelengths for the 2p3p 1 P e ! 2p3d 1 D o , 2p 2 3 P e ! 2p3d 3 D o , 2p3p 3 P e ! 2p3d 3 D o , and 2p3p 3 P e ! 2p3d 3 D o transitions for different Debye lengths are reported. Comparisons are made with the existing results. Results for B IV and C V for different screening parameters are reported for the first time in the literature. Transition wavelengths show interesting behavior with increasing screening parameters and nuclear charge. V C 2012 American Institute of Physics. [http://dx.
We investigate the effect of plasma screening on the tune-out wavelengths for helium atom using correlated exponential wave function within the framework of Debye shielding approach. The pseudostate summation technique has been used to calculate the dynamic dipole polarizability for the states (2 1S, 3 1S, 2 3S, 3 3S) of helium embedded in plasma environments. In a free-atomic system, our calculated results are in agreement with available theoretical and experimental predictions. The tune-out wavelengths show interesting behavior as functions of screening parameter.
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