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Issue 22, 2014
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Absolute electron total ionization cross-sections: molecular analogues of DNA and RNA nucleobase and sugar constituents

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Abstract

Accurate ionization cross-sections for DNA and RNA constituents in the condensed or aqueous phase are important parameters for models simulating radiation damage to genetic material in living cells. In this work, absolute gas-phase electron total ionization cross-sections (TICSs) have been measured for a series of six aromatic and eight non-aromatic cyclic species that can be considered as prototype functional group analogues for the nucleobases and sugar backbone constituents of DNA and RNA. TICSs for water, hexane, and ethylacetamide (a peptide bond analogue) are also reported. The experimental apparatus utilizes a cylindrical ion collector that surrounds the ionization region, providing essentially unit detection efficiency. Two theoretical models, the polarizability–correlation method and binary-encounter Bethe theory, are able to reproduce the measured maximum TICS well for all species studied. An empirical energy-dependent correction is found to yield improvement in the agreement between experimental energy-dependent cross sections and the predictions of the BEB model. Having characterised and optimised the performance of both models, they are then used to predict TICSs for gas-phase DNA and RNA nucleobases and sugars. Direct experimental determinations of TICSs for these species are difficult because of their low volatility, which makes it difficult to prepare suitable gas-phase samples for measurement.

Graphical abstract: Absolute electron total ionization cross-sections: molecular analogues of DNA and RNA nucleobase and sugar constituents

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Supplementary files

Article information


Submitted
01 Feb 2014
Accepted
29 Mar 2014
First published
03 Apr 2014

Phys. Chem. Chem. Phys., 2014,16, 10743-10752
Article type
Paper
Author version available

Absolute electron total ionization cross-sections: molecular analogues of DNA and RNA nucleobase and sugar constituents

J. N. Bull, J. W. L. Lee and C. Vallance, Phys. Chem. Chem. Phys., 2014, 16, 10743
DOI: 10.1039/C4CP00490F

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