Unpaired electron species in thin films of calf-thymus DNA molecules induced by nitrogen and oxygen K-shell photoabsorption

T. Oka, A. Yokoya, K. Fujii, Y. Fukuda, M. Ukai

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)

Abstract

The mechanism of DNA modification induced by K-shell photoabsorption of nitrogen and oxygen atoms was investigated by electron paramagnetic resonance and x-ray absorption near edge structure measurements of calf thymus DNA. A g factor of 2.000 for the unpaired electron species, which only arises during irradiation, was measured. The EPR intensities for DNA zwere twofold times larger than those estimated based on the photoabsorption cross section. This suggests that the DNA film itself forms unpaired electron species through the excitation of enhanced electron recapturing, known as the postcollision interaction process.

Original languageEnglish
Article number213001
JournalPhysical review letters
Volume109
Issue number21
DOIs
Publication statusPublished - 2012 Nov 20
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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