2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/18585We present quantum Monte Carlo calculations of total energy derivatives, consistently performed in the fixed-node approximation. Contributions from nodal displacements, neglected or approximated in previous investigations, are properly taken into account. Their impact on the efficiency is discussed.4 pages, 3 figures, Proceedings of Quantum Monte Carlo meeting, Trento (Italy) from July 3rd to July 6th, 2001Condensed Mattertext