Electronic structure study of the bases in DNA duplexes by in situ photon-in/photon-out soft X-ray spectroscopy
2010 (English)In: Journal of Electron Spectroscopy and Related Phenomena, ISSN 0368-2048, Vol. 181, no 2-3, 197-201 p.Article in journal (Refereed) Published
Understanding protein functionality is of fundamental importance in biochemistry. Soft X-ray transitions, where the core-level vacancies are filled by the valence-orbital electrons, give direct information about the chemical bonding. Soft X-ray absorption and emission study of poly(dG) -poly(dC) in aqueous solutions can elucidate the relation between the structure and functionality of proteins. We report the N K-edge soft X-ray absorption (XAS) and resonant soft X-ray emission spectroscopy (XES) to characterize the electronic structure near the Fermi level of DNA duplexes to specify the charge migration mechanism. Since N atoms are included in only bases in DNA duplexes, the XES spectra excited from N Is to unoccupied states purely extract the electronic orbital features of the bases in DNA. The fact that N atoms in different bonding environments form well-defined structure has been determined. The experimental findings provide the evidence for the charge-hopping and/or charge-transfer effects in understanding of electric conduction in DNA duplexes when electrons pass through the pi* states of DNA bases.
Place, publisher, year, edition, pages
2010. Vol. 181, no 2-3, 197-201 p.
Soft X-ray absorption and emission spectroscopy, RIXS, Electronic structure, DNA, G-C pair, A-T pair
IdentifiersURN: urn:nbn:se:kth:diva-29215DOI: 10.1016/j.elspec.2010.05.014ISI: 000281932100022ScopusID: 2-s2.0-77955850851OAI: oai:DiVA.org:kth-29215DiVA: diva2:393434
QC 201101312011-01-312011-01-272011-01-31Bibliographically approved