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This section describes the work carried out by the author in the field
of optimising trial wavefunctions for use in Variational Quantum Monte
Carlo (VMC) and Diffusion Quantum Monte Carlo (DMC) calculations.
The motivation for optimising trial wavefunctions is introduced in the
light of recent results for the ground state energy of solid germanium
in the diamond structure using VMC and DMC. The techniques used to
perform the optimisation and the choice of functions to optimise are
described in a similar order to that in which the work was
originally performed. Results are given at the end of each stage of the
optimisation as they had a major influence on the future direction of
the project. Finally, some suggestions for the continuation and
application of the work are given.
Andrew Williamson
Mon May 22 14:48:37 BST 1995