A. Luchow et Jb. Anderson, ACCURATE QUANTUM MONTE-CARLO CALCULATIONS FOR HYDROGEN-FLUORIDE AND THE FLUORINE ATOM, The Journal of chemical physics, 105(11), 1996, pp. 4636-4640
Quantum Monte Carlo calculations of the ground state energies of the f
luorine atom and the hydrogen fluoride molecule have been carried out
using both fixed-node and released-node methods. The fixed-node total
energies for both F and FH are among the most accurate available. The
fixed-node dissociation energy D-e = 141.3(4) kcal mol(-1) is in excel
lent agreement with experimental data. The cancellation of the nodal e
rror was achieved with trial wave functions having nodal surfaces dete
rmined by Slater determinants of the near Hartree-Fock limit quality.
With the released-node Green's function quantum Monte Carlo method the
lowest upper bounds to the ground state energies to date for both F [
E(0) = -99.731(4) Hartree] and FH [E(0) = -100.458(5) Hartree] have be
en obtained. (C) 1996 American Institute of Physics.