Dispersion coefficients for interactions between hydrogen and helium atoms with Coulomb and screened Coulomb potentials

Abstract

We have carried out calculations to investigate Van der Waals two-body dispersion coefficients C 8 , C 10 and C 12 for the H(1s 2 S)-He(1s 2 1 S) system with screened Coulomb interactions in the framework of a powerful computational technique. The dispersion coefficients for different screening parameters ranging from 0 to 1a −1 0 are reported. In the unscreened case, the C 12 coefficient is reported for the first time in the literature.

Dispersion coefficients for Li+–H and Li+–He systems with coulomb and screened coulomb potentials

“…In plasma physics, the screening parameter λ D is known as the Debye length. The significance of statically screened Coulomb potentials for many areas of physics and chemistry has been highlighted in various earlier publications 3–5, 22–24. Recently, we have reported dipole, quadrupole, octupole, and hexadecapole polarizabilities of He and H − 4, 12, 22.…”

“…In our earlier papers, we have reported the C 6 , C 8 , C 10 , and C 12 coefficients for the interaction among H and He in the screening environments 3–5. The purpose of this article is to present new results of dispersion coefficients C 6 , C 8 , C 10 , and C 12 for Li + –H and Li + –He systems as functions of the screening parameters ranging from 0 to 1.0 a using the Slater type wave functions for H and the highly correlated wave functions for He in the framework of pseudostate summation technique 5–12. Li + –He system is of great experimental and theoretical interests for long time 13.…”

Dynamic multipole polarizabilities of Li and Na atoms interacting with Debye potentials

“…Recently we have investigated the plasma screening effects on the static multipole polarizabilities [1] and dynamic dipole polarizabilities [2] of Li and Na atoms within the framework of Debye shielding approach of plasma modeling using the symplectic algorithm. Plasma screening effects on the atomic processes based on the Debye model have gained tremendous attention in the recent years [3][4][5][6][7][8][9][10][11][12]. In this work, we investigate the dynamic quadrupole and octupole polarizabilities of Li and * E-mail: skar@hit.edu.cn Na atoms embedded in Debye plasma environments.…”

Ground-state stability and criticality of two-electron atoms with screened Coulomb potentials using the B-splines basis set

“…The Yukawa potential has been used in many branches of physics, for example, to describe interactions in dusty plasmas where charged dust particles are surrounded by plasma [3], liquid metals [4] and charged colloidal particles [5]. Two-electron systems interacting via Yukawa potentials were the subject of recent research, studying the bound states using the Hylleraas basis set [6][7][8][9][10] and B-spline expansions [11]. Also, scattering processes were recently presented [12] using Yukawa potentials.…”