I was wondering if anyone would know the scaling factors for the three basis sets below. HF/6-311+G(d) MP2/6-311+G(d) B3PW91/6-311+G(d) I have looked at the paper by Scott and Radom (J. Phys. Chem. 1996, 100, 16502), but was unable to find the factors for my above basis sets. If anyone knows where to obtain some papers (include references) for more scaling factors I'd appreciate it. Ben Moritz "Whom the Gods destroy, they first make mad."