Doubly differential distribution of electron emission in ionization of uracil in collisions with 3.5-MeV/u bare C ions - IN2P3 - Institut national de physique nucléaire et de physique des particules Access content directly
Journal Articles Physical Review A : Atomic, molecular, and optical physics [1990-2015] Year : 2013

Doubly differential distribution of electron emission in ionization of uracil in collisions with 3.5-MeV/u bare C ions

Abstract

We report the energy and angular distribution of the electron emission from an RNA base molecule uracil in collisions with 3.5-MeV/u bare C ions. The absolute double differential cross sections (DDCS) are measured for emission energy between a few to 600 eV. The angular distributions are compared to those obtained for the O2 molecule in the same experiment. The single differential cross sections (SDCS) are also deduced. The energy and angular distributions of the DDCS and SDCS are compared with the state-of-the-art quantum-mechanical models based on continuum distorted wave-eikonal initial state (CDW-EIS) and correct boundary first Born (CB1) approximations which use a suitable molecular wave function for uracil. The models, however, give substantial deviations from the observed energy and angular distributions of the DDCS as well as SDCS. The CDW-EIS calculations are closer to the data compared to the CB1. In the case of uracil a large difference in the forward-backward emission of electrons was observed in comparison to that in collisions with an oxygen molecule.

Dates and versions

in2p3-00823550 , version 1 (17-05-2013)

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Cite

A.N. Agnihotri, S. Nandi, S. Kasthurirangan, A. Kumar, M.E. Galassi, et al.. Doubly differential distribution of electron emission in ionization of uracil in collisions with 3.5-MeV/u bare C ions. Physical Review A : Atomic, molecular, and optical physics [1990-2015], 2013, 87, pp.032716. ⟨10.1103/PhysRevA.87.032716⟩. ⟨in2p3-00823550⟩

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