Dynamic Multipole Polarizabilities of Helium and Screened-Helium Atoms

• Main Authors: Yu-Shu Wang, Sabyasachi Kar, Yew Kam Ho
• Format: Article
• Language: English
• Published: MDPI AG 2020-12-01
• Series: Atoms
• Subjects: dynamic multipole polarizability; helium atom; screened-helium atom; Debye–Hückel potential; correlated exponential wavefunctions; pseudo-state summation method
• Online Access: https://www.mdpi.com/2218-2004/8/4/90

The precise estimation of atomic polarizabilities impinges upon a number of areas and processes in physical science. We calculate precisely the dynamic multipole polarizabilities of the helium and screened-helium atoms using highly correlated exponential wavefunctions based on the pseudo-state summation method. For screened environments, we consider the Debye–Hückel potential (DHP) as the interaction potentials between the charged particles. The dynamic multipole (quadrupole, octupole, and hexadecapole) polarizabilities for the ground state of the helium atom and the multipole (quadrupole and octupole) polarizabilities of the screened-helium atom for different screening parameters are reported along with magic-zero wavelengths. The reported results for hexadecapole polarizability of the helium atom and dynamic multipole polarizability of the screened-helium atom are new and would be useful for future investigation on this topic.