Short-time fixed-node pure diffusion quantum Monte Carlo (PDMC) calculations with pseudopotentials for the group III elements B, Al, Ga and In have been carried out in order to study the capability of multireference trial wavefunctions to reduce the fixed-node and localization error. For this purpose PDMC energies for the2P and4P states of the neutral atoms and for the1S state of the positive ions have been compared with the results of MRCI calculations. For these simple systems, we demonstrate the possibility of a systematic reduction of these errors by adding supplementary configurations to the trial wavefunction. © 1994.
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