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Pariser–Parr–Pople method
In molecular physics, the Pariser–Parr–Pople method applies semi-empirical quantum mechanical methods to the quantitative prediction of electronic structures and spectra, in molecules of interest in the field of organic chemistry. Previous methods existed, such as the Hückel method which lead to the Hückel's rule, but were limited in their scope, application and complexity, as is the Extended Huckel method.
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