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American Chemical Society, Journal of the American Chemical Society, 15(129), p. 4706-4713, 2007

DOI: 10.1021/ja068440z

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Base-dependent electron photodetachment from negatively charged DNA strands upon 260-nm laser irradiation

Journal article published in 2007 by Valérie Gabelica ORCID, Frédéric Rosu, Thibault Tabarin, Catherine Kinet, Rodolphe Antoine ORCID, Michel Broyer, Edwin De Pauw ORCID, Philippe Dugourd
This paper is available in a repository.
This paper is available in a repository.

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Abstract

DNA multiply charged anions stored in a quadrupole ion trap undergo one-photon electron ejection (oxidation) when subjected to laser irradiation at 260 nm (4.77 eV). Electron photodetachment is likely a fast process, given that photodetachment is able to compete with internal conversion or radiative relaxation to the ground state. The DNA [6-mer](3-) ions studied here show a marked sequence dependence of electron photodetachment yield. Remarkably, the photodetachment yield (dG(6) > dA(6) > dC(6) > dT(6)) is inversely correlated with the base ionization potentials (G