Talk:Semi-empirical quantum chemistry method

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[Untitled]

This page is not quite correct...semiempirical methods, at least pi-electron methods, are not necessarily based on HF. They are primarily excited state methods, based on approximate CI, and are parameterized as such.

Consequently, it has been possible to provide an ab initio basis for semiempirical pi-electron methods using the Effective Hamiltonian theory (Freed, Brandow, etc.)

This is well established, and even Zerner himself acknowledged this before he died in his last review article. —Preceding unsigned comment added by Charlesmartin14 (talk • contribs) 15:30, 27 June 2008 (UTC)[reply]