Electronic structure study of the bases in DNA duplexes by in situ photon-in/photon-out soft X-ray spectroscopy

Guo, J. -H (author)

Söderström, Johan, 1978- (author): Uppsala universitet,Molekyl- och kondenserade materiens fysik,Yt- och gränsskiktsvetenskap

Glans, P. -A (author)

West, M. (author)

Learmonth, T. (author)

Chiou, J. -W (author)

Smith, K. (author)

Pong, W. -F (author)

Cheng, H. (author)

Griffiss, J. M. (author)

(creator_code:org_t)

Elsevier BV, 2010
2010
English.
In: Journal of Electron Spectroscopy and Related Phenomena. - : Elsevier BV. - 0368-2048 .- 1873-2526. ; 181:2-3, s. 197-201

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Abstract Subject headings

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.

NATURVETENSKAP -- Kemi -- Analytisk kemi (hsv//swe)
NATURAL SCIENCES -- Chemical Sciences -- Analytical Chemistry (hsv//eng)
NATURVETENSKAP -- Fysik -- Atom- och molekylfysik och optik (hsv//swe)
NATURAL SCIENCES -- Physical Sciences -- Atom and Molecular Physics and Optics (hsv//eng)
NATURVETENSKAP -- Fysik (hsv//swe)
NATURAL SCIENCES -- Physical Sciences (hsv//eng)

By the author/editor: Guo, J. -H; Kashtanov, Stepa ...; Söderström, Joha ...; Glans, P. -A; West, M.; Learmonth, T.; show more...; Chiou, J. -W; Luo, Yi; Nordgren, J.; Smith, K.; Pong, W. -F; Cheng, H.; Griffiss, J. M.; show less...

About the subject

NATURAL SCIENCES: NATURAL SCIENCES; and Chemical Science ...; and Analytical Chemi ...

NATURAL SCIENCES: NATURAL SCIENCES; and Physical Science ...; and Atom and Molecul ...

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