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Temperature dependence of the cross section for the fragmentation of thymine via dissociative electron attachment

Abstract : Providing experimental values for absolute Dissociative Electron Attachment (DEA) cross sections for nucleobases at realistic biological conditions is a considerable challenge. In this work, we provide the temperature dependence of the cross section, σ, of the dehydrogenated thymine anion (T − H)− produced via DEA. Within the 393-443 K temperature range, it is observed that σ varies by one order of magnitude. By extrapolating to a temperature of 313 K, the relative DEA cross section for the production of the dehydrogenated thymine anion at an incident energy of 1 eV decreases by 2 orders of magnitude and the absolute value reaches approximately 6 × 10−19 cm2. These quantitative measurements provide a benchmark for theoretical prediction and also a contribution to a more accurate description of the effects of ionizing radiation on molecular medium.
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http://hal.in2p3.fr/in2p3-01155118
Contributor : Dominique Girod <>
Submitted on : Tuesday, May 26, 2015 - 10:59:36 AM
Last modification on : Thursday, June 17, 2021 - 3:19:04 PM

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J. Kopyra, H. Abdoul-Carime. Temperature dependence of the cross section for the fragmentation of thymine via dissociative electron attachment. Journal of Chemical Physics, American Institute of Physics, 2015, 142, pp.174303. ⟨10.1063/1.4919638⟩. ⟨in2p3-01155118⟩

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