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

Details A variational Monte Carlo calculation of dynamic multipole polarizabilities and van der Waals coefficients of the PsH system A variational Monte Carlo calculation of dynamic multipole polarizabilities and van der Waals coefficients of the PsH system

2000-10-25

arxiv.org/abs/physics/0010061v1

Physics

Atomic Physics

10 pages, 1 figure, submitted to Phys. Rev. A

Scientific paper

10.1103/PhysRevA.63.024503

The first three dynamic multipole polarizabilities for the ground state of hydrogen, helium, hydride ion, and positronium hydride PsH have been computed using the variational Monte Carlo (VMC) method and explicitly correlated wave functions. Results for the static dipole polarizability by means of the diffusion Monte Carlo (DMC) method and the finite field approach show the VMC results to be quite accurate. From these dynamic polarizabilities van der Waals dispersion coefficients for the interaction of PsH with ordinary electronic systems can be computed, allowing one to predict the dispersion energy for the interaction between PsH and less exotic atoms and molecules.

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