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Transient negative ion spectrum of the cytosine-guanine pair

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Abstract

We employed elastic scattering calculations, performed in the static exchange approximation, to investigate the π ∗ transient anion states of cytosine, guanine and the cytosine-guanine pair. Our results for the isolated monomers, also obtained in the static-exchange plus polarization approximation, are in good agreement with the available calculations and electron transmission data. Virtual orbital analysis for the lower-lying π ∗ anion states, with pure shape resonance character, indicates that electron attachment to the cytosine-guanine pair gives rise to resonances located on either monomer (the orbitals do not delocalize over the pair). The π ∗ shape resonances of the pair localized on the cytosine unit have lower energies in comparison with those of the isolated base, with the opposite trend for the guanine unit. The underlying mechanism would be the net positive charge transfer to the cytosine unit, as the guanine monomer acts as a proton donor in two out of the three hydrogen bonds formed in the pair. Even though the calculations were performed in the static-exchange approximation (due to the size of the system), the conclusions drawn were also corroborated by empirical estimates of the vertical attachment energies. The results for the cytosine-guanine pair are compared to those previously obtained for the formic acid-formamide complex, having two hydrogen bonds with opposite donor/acceptor characters and negligible charge transfer.

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Authors and Affiliations

  1. Departamento de Física, Universidade Federal do Paraná, Caixa Postal 19044, 81531-990, Curitiba, Paraná, Brazil

    Fernanda Brandalise Nunes, Diego Farago Pastega, Márcio Henrique Franco Bettega & Sergio d’Almeida Sanchez

  2. Instituto de Física, Universidade de São Paulo, Rua do Matão 1731, 05508-090, São Paulo, São Paulo, Brazil

    Márcio Teixeira do Nascimento Varella

  3. Tecnologia em Luteria, Universidade Federal do Paraná, 81520-260, Curitiba, Paraná, Brazil

    Thiago Correa Freitas

  4. Instituto de Física Gleb Wataghin, UNICAMP, 13083-970, Campinas, São Paulo, Brazil

    Marco Aurélio Pinheiro Lima

Authors
  1. Fernanda Brandalise Nunes
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  2. Márcio Teixeira do Nascimento Varella
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  3. Diego Farago Pastega
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  4. Thiago Correa Freitas
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  5. Marco Aurélio Pinheiro Lima
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  6. Márcio Henrique Franco Bettega
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  7. Sergio d’Almeida Sanchez
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Correspondence to Sergio d’Almeida Sanchez.

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Nunes, F.B., do Nascimento Varella, M.T., Pastega, D.F. et al. Transient negative ion spectrum of the cytosine-guanine pair. Eur. Phys. J. D 71, 92 (2017). https://doi.org/10.1140/epjd/e2017-70786-5

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