Dispersion coefficients for interactions between helium atoms in Debye plasmas

Effect of Debye plasmas on the dispersion coefficients C₈, C₁₀, and C₁₂ for interactions between atoms has been investigated using highly accurate correlated exponential basis functions. In the free-atom case, the dispersion C₁₂ coefficient and the hexadecapole polarizability for helium are reported. The dispersion coefficients, hexadecapole polarizability, and $1s5g$ ¹Gᵉ state energy of helium for different screening parameters are also reported.