Effect of Debye plasmas on the dispersion coefficients C6 for interactions among H and He atoms

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.…”

Excitons and the Positronium Negative Ion: Comparison of Spectroscopic Properties

“…The long-range part of the interaction potential between two spherically symmetric atoms a and b separated by a distance R can be written as a series with coefficients C n denoted as dispersion coefficients [93,[100][101][102]:…”

“…The numbers in square brackets indicate the power of 10. To investigate the effect on the dispersion coefficients C 6 in the screening environments, one can assume that the leading term in the Van der Waals interaction between two atoms a and b in their ground states still has a form of R À6 , as [101,102] V ab ¼À C 6 μ ÀÁ…”

“…Knowledge of the Van der Waals two-body dispersion coefficients in the multipole expansion of the second-order long-range interaction between a pair of atoms is of utmost importance for the quantitative interpretation of the equilibrium properties of gases and crystals, of transport phenomena in gases, and of phenomena occurring in slow atomic beams ( [93,[100][101][102], references therein). The long-range part of the interaction potential between two spherically symmetric atoms a and b separated by a distance R can be written as a series with coefficients C n denoted as dispersion coefficients [93,[100][101][102]:…”