Dynamic Polarizability for Metastable Helium in Debye Plasmas

The dynamic dipole polarizability (DDP) for metastable helium in plasma environments has been studied recently (Kar et al. in Phys Plasmas 23:082119, 2016) by incorporating plasma screening effect on electron–nucleus interactions. In this work, we investigate the DDP for metastable helium immersed in Debye plasmas using screening effects on both electron–nucleus and electron–electron interactions. The dynamic dipole polarizabilities for the \(n\,{}^{1}\hbox {S}\,(n=2,3)\) and \(n\,{}^{3}\hbox {S}\,(n=2,3)\) states are reported as functions of Debye screening parameter. First tune-out wavelengths for the \(n\,{}^{1}\hbox {S}\,(n=1,2,3)\) and \(n\,{}^{3}\hbox {S}\,(n=2,3)\) states and magic wavelengths for the \(2\,{}^{3}\hbox {S} \rightarrow 3\,{}^{3}\hbox {S}\) transition are also reported in terms of Debye screening parameter. Magic wavelengths in screening environments are presented for the first time in the literature.