2000 Feb 16 Subject: the Pariser-Parr-Pople method Could someone with some familiarity with the PPP method please tell me: 1) is it still used at all? 2) was it used for calculation of UV spectra *at a given geometry* only, or could it perform realistic geometry optimizations on pi-systems? 2) what has it evolved into: what currently popular method or program for calculating electronic spectra is an offspring of the PPP method? Thank you. E. Lewars =====