Localization of electrons in the sugar/phosphate backbone in DNA investigated via resonant Auger decay spectra

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Yuji Baba,¹ Tetsuhiro Sekiguchi,¹ Iwao Shimoyama,¹ Norie Hirao,¹ and Krishna G. Nath²
¹Japan Atomic Energy Agency, Tokai-mura, Naka-gun, Ibaraki-ken, 319-1195, Japan
²INRS-EMT, University of Quebec, 1650 Boul. Lionel Boulet, Varennes, QC, Canada J3X 1S2

Received 11 July 2006; published 28 November 2006

Inorder to elucidate the localized nature of electrons in sugar/phosphatebackbone in DNA molecules, resonant Auger decay spectra excited bysoft x-rays around the inner-shell ionization thresholds have been measuredfor single-strand DNA. The systems investigated are thin films ofDNA as well as related phosphorus compounds such as nucleotide(adenosine triphosphate, ATP), sodium phosphate, and indium phosphide. For ATPand DNA, it was observed that the resonant excitations fromP 1s to valence unoccupied ^* orbitals are followed byspectator-type Auger decays where the excited electrons remain in valenceorbitals during the core-hole decays. It was also found thatthe energy of the P KL_2,3L_2,3 (2p⁻¹·^*) spectator Auger peakshifts linearly with the photon energy due to the resonantAuger Raman scattering. Most of the decay channel at thecore-to-valence resonant excitation is spectator-type Auger decay in DNA, whichis quite different from the Auger decay processes in metallicand semiconducting materials. We conclude that the excited electrons invalence unoccupied states around the phosphates in DNA molecules arestrongly localized, resulting in the insulating properties in a one-dimensionaldirection along sugar/phosphate backbone.

URL:	http://link.aps.org/doi/10.1103/PhysRevB.74.205433
DOI:	10.1103/PhysRevB.74.205433
PACS:	82.80.Pv; 87.14.Gg; 87.64.Lg 82.80.Pv Electron spectroscopy (chemical analysis) including X-ray photoelectron (XPS), Auger electron spectroscopy (AES), etc 87.14.Gg DNA, RNA 87.64.Lg Electron and photoelectron spectroscopy in biophysics and medical physics YEAR: 2006
KEYWORDS:	DNA, core levels, Auger electron spectra, thin films, valence bands, Raman spectra, molecular biophysics

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