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In our previous publication we have mistakenly claimed that the applicabilityof the Hellmann-Feynman theorem in fixed-node quantum Monte Carlo calculationsis not subject to the manner how the nodal boundary depends on an externalparameter. This statement is not correct in general, except where theHellmann-Feynman force is calculated for a nodal boundary which coincides withthat of the unconstrained exact eigenfunction. We point out the error in ourarguments and present an explicit expression for the correction term whichsupplements the Hellmann-Feynman force. This term can be interpreted as thelinear response of the energy with respect to variations of the the nodalregion.Comment: 2 page

Response to “Comment on ‘Quantum Monte Carlo study of the dipole moment of CO’ ” [J. Chem. Phys. 112, 4419 (2000)]