RT Journal Article
T1 Cross sections for positron and electron collisions with an analog of the purine nucleobases: Indole
A1 Chiari, Luca
A1 Zecca, Antonio
A1 Blanco Ramos, Francisco
A1 García, Gustavo
A1 Brunger, M.J.
AB Quantitative information about positron and electron collisions with nucleobases is required in charged-particle track simulations to accurately model and assess any radiation damage at the subcellular level in biological systems. However, scattering experiments have so far been restricted to the pyrimidine nucleobases. In this paper we report on total-cross-section measurements for positron impact on indole, a parent molecule of the purine nucleobases, at impact energies between 1 and 25 eV. We also present theoretical cross sections for elastic and total scattering, positronium formation, electronic excitations, and direct ionization between 1 and 500 eV, as calculated with the independent-atom model with the screening-corrected additivity rule. Rotational excitation cross sections are additionally calculated within a Born framework over that same energy range. A significant discrepancy is found between the measured and computed total cross sections, which cannot be entirely accounted for by the lack of forward-angle-scattering discrimination in the experiment. The present results are also compared to the available theoretical cross sections for the purine nucleobases. In addition, total cross sections for electron-indole collisions computed within our theoretical formalism are provided.
PB Amer Physical Soc
SN 1050-2947
YR 2015
FD 2015-01-26
LK https://hdl.handle.net/20.500.14352/22993
UL https://hdl.handle.net/20.500.14352/22993
LA eng
NO ©2015 American Physical SocietyThe experimental work was undertaken under a Memorandum of Understanding between the University of Trento and the Flinders University node of the Australian Research Council Centre of Excellence for Antimatter-Matter Studies. G.G. and F.B. would like to acknowledge the Spanish Ministerio de Economía y Productividad (Project No. FIS2012-31230) and the European Science Foundation (COST Action Grants No. MP1002−Nano-IBCT and No. MC1301-CELINA) for financial support.
NO Spanish Ministerio de Economia y Productividad
NO European Science Foundation (COST Action)
DS Docta Complutense
RD 21 dic 2025