Pseudospectral Mo/ller–Plesset perturbation theory through third order

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Abstract
We present a formulation and implementation of Mo/ller–Plesset perturbation theory in a pseudospectral framework. At the second‐order level, the pseudospectral formulation is a formally a factor of N/n faster than conventional approaches, while the third order is formally faster by a factor of n, where N is the number of atomic orbitals and n is the number of occupied orbitals. The accuracy of the resulting energies is probed for a number of test cases. Practical timings are presented and show conclusively that the pseudospectral formulation is faster than conventional ones.