Electronic Structure of Bases in DNA Duplexes Characterized byResonant Photoemission Spectroscopy Near the Fermi Level

H. S. Kato, M. Furukawa, M. Kawai, M. Taniguchi, T. Kawai, T. Hatsui, and N. Kosugi

Phys. Rev. Lett. 93, 086403 – Published 19 August 2004

Abstract

The electronic structure of bases in DNA duplexes was investigated by resonant photoemission spectroscopy near the Fermi level, in order to specify charge migration mechanisms. We observed a kinetic energy shift of N-KLL Auger electrons and an intensity enhancement of valence electrons on the resonant photoemission spectra for both poly(dG)·poly(dC) and poly(dA)·poly(dT) DNAs. These directly show the localized unoccupied states of the bases. We conclude that the charge hopping model is pertinent for electric conduction in a DNA duplex, when electrons pass through the unoccupied states.

Received 26 March 2004

DOI:https://doi.org/10.1103/PhysRevLett.93.086403

Authors & Affiliations

H. S. Kato¹, M. Furukawa¹, M. Kawai^1,*, M. Taniguchi², T. Kawai², T. Hatsui³, and N. Kosugi³

¹RIKEN (The Institute of Physical and ChemicalResearch), Wako, Saitama 351-0198, Japan
²The Institute of Scientific and Industrial Research, OsakaUniversity, Ibaraki, Osaka 567-0047, Japan
³UVSOR Facility, Institute for Molecular Science(IMS), Okazaki, Aichi 444-8585, Japan

^*Corresponding author. E-mail address: maki@riken.jp

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Issue

Vol. 93, Iss. 8 — 20 August 2004

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