| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 5396329 | Journal of Electron Spectroscopy and Related Phenomena | 2010 | 5 Pages |
Abstract
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 1s 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 Ï* states of DNA bases.
Keywords
Related Topics
Physical Sciences and Engineering
Chemistry
Physical and Theoretical Chemistry
Authors
J.-H. Guo, S. Kastanov, J. Soderstrom, P.-A. Glans, M. West, T. Learmonth, J.-W. Chiou, Y. Luo, J. Nordgren, K. Smith, W.-F. Pong, H. Cheng, J.M. Griffiss,