Abstract
The process of negative ion formation by electron impact on cytosine (a nitrous base of nucleic acids) has been studied in crossed molecular and electron beams for electron energies in the interval from 0.4 to 5.0 eV. Using a specially developed method, the molecular beam intensity was determined and the energy dependence of the absolute cross section Q for the formation of cytosine anions was studied. The maximum ionization cross section σ = 4.2 × 10−18 cm2 was observed for an electron energy of 1.5 eV.
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