title: A study of the excited states in cytosine and guanine stacks in the Hartree-Fock and exciton approximations.
abstract: We report calculated exciton energies for the cytosine and guanine stacks obtained in the ab initio Hartree-Fock crystal orbital and exciton approximation, which includes the excited electron-hole interaction. This interaction plays an important role in the description of excited electron spectra in the low-energy region. The stacks were chosen as examples of polymers with helical symmetry.
authors.affiliation: Center for Radiological Research, College of Physicians and Surgeons, Columbia University, New York 10032.
authors.forename: M
authors.initials: M
authors.lastname: Grobelsek-Vracko
authors.forename: M
authors.initials: M
authors.lastname: Zaider
mesh_terms: D004247:DNA / Q000737:chemistry; D004583:Electrons; D008433:Mathematics; D008962:Models, Theoretical; D009690:Nucleic Acid Conformation; D017785:Photons; D011066:Poly C / Q000737:chemistry*; D011068:Poly G / Q000737:chemistry*
chemical_list: D011068:Poly G; D011066:Poly C; D004247:DNA