On alternant molecules with identical energy spectra: Isospectral molecules

Abstract

It is shown that if a pair of alternant molecules are isospectral (they have identical energy spectra) in the topological—Hückel—approximation they are also isospectral, taking into account the electron correlation. The proof is given in the AMO approximation using a Hubbard Hamiltonian. © 1997 John Wiley & Sons, Inc.