Electronic structure and charge carriers in metallic DNA investigated by soft x-ray spectroscopy

J. B. MacNaughton, E. Z. Kurmaev, L. D. Finkelstein, J. S. Lee, S. D. Wettig, and A. Moewes
Phys. Rev. B 73, 205114 – Published 22 May 2006

Abstract

Resonant inelastic x-ray scattering (RIXS) measurements of dried metallic DNA with metal ions incorporated inside the helix [(X)∙M-DNA, X=Co,Ni], dried DNA with metal ions attached to the outside of the helix [(X)∙B-DNA, X=Co,Ni], and dried double-strand DNA (B-DNA) are presented. The metal L edge RIXS spectra show that the I(L2)I(L3) intensity ratio can be used as a probe of metallicity in 3d metal-containing systems because of the influence of nonradiative Coster-Kronig transitions. Using this technique it is found that (X)∙B-DNA has fewer mobile charge carriers than (X)∙M-DNA. X-ray absorption measurements at the L edge of the 3d metals are compared to density functional calculations to confirm that spectral features are not simply results of residual metal impurities. Nitrogen RIXS measurements reveal that the occupied electronic states are more localized in B-DNA than in (X)∙M-DNA systems.

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  • Received 6 February 2006

DOI:https://doi.org/10.1103/PhysRevB.73.205114

©2006 American Physical Society

Authors & Affiliations

J. B. MacNaughton1, E. Z. Kurmaev2, L. D. Finkelstein2, J. S. Lee3, S. D. Wettig4, and A. Moewes1

  • 1Department of Physics and Engineering Physics, University of Saskatchewan, 116 Science Place, Saskatoon, Saskatchewan S7N 5E2, Canada
  • 2Institute of Metal Physics, Russian Academy of Sciences Ural Division, 620219 Yekaterinburg GSP-170, Russia
  • 3Department of Biochemistry, University of Saskatchewan, 107 Wiggins Road, Saskatoon, Saskatchewan S7N 5E5, Canada
  • 4College of Pharmacy and Nutrition, University of Saskatchewan, 110 Science Place, Saskatoon, Saskatchewan S7N 5C9, Canada

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Vol. 73, Iss. 20 — 15 May 2006

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