Dispersion coefficients for interactions between helium atoms in Debye plasmas

Abstract

Effect of Debye plasmas on the dispersion coefficients ${C}_{8}$, ${C}_{10}$, and ${C}_{12}$ for interactions between atoms has been investigated using highly accurate correlated exponential basis functions. In the free-atom case, the dispersion ${C}_{12}$ coefficient and the hexadecapole polarizability for helium are reported. The dispersion coefficients, hexadecapole polarizability, and $1s5g$ ${}^{1}{G}^{e}$ state energy of helium for different screening parameters are also reported.