Variational Monte Carlo calculation of dynamic multipole polarizabilities and van der Waals coefficients of the PsH system

Variational Monte Carlo (VMC) method and correlated wave functions were employed for the computation of dynamic multipole polarizabilities for the ground state of hydrogen, helium, hydride ion, and positronium hydride (PsH). The computations were made to understand the species' system behavior upon interaction with an external field. The static dipole polarizability results by Monte Carlo method and the finite field approach depicted the accuracy of the VMC results. The van der Waals dispersion coefficients for the interaction between different systems were computed from the dynamic polarizabilities.