Comment on 'Optimization of Ground- and Excited-State Wave Functions and van der Waals Clusters'

摘要

In a recent Letter Nightingale and Melik-Alaverdian [1] used the correlation function quantum Monte Carlo method (CFMC) [2,3] to compute vibrational energy levels of Ar_n with n up to 7. In this Comment we point out that the trial functions used in Ref. [1] prevent the authors from obtaining odd-parity states and thus that they miss some of the levels.