The Role of Multiple Ionization of H₂O in Heavy Ion Collisions
Collisional ionization processes involving H2O molecules and C6+, O8+, Si13+ ions are studied by means of the classical trajectory Monte Carlo method using molecular orbital calculations to define the ionization stages of the water molecule. Net total and single-differential cross sections in energy and angle are obtained by using a newly developed model that goes beyond the commonly applied one-active electron approximation. This model allows us to access the fraction of electron emission arising from single and multiple electron ionization. Calculated cross sections are contrasted and benchmarked against available experimental data at impact energies in the MeV/u range. The present results highlight the important role of multiple ionization in the emission of electrons where we find the majority of electrons emitted with energies greater than ∼50 eV arise from multiple ionization collisions.
N. Bachi et al., "The Role of Multiple Ionization of H₂O in Heavy Ion Collisions," Physics in Medicine and Biology, vol. 64, no. 20, Institute of Physics - IOP Publishing, Oct 2019.
The definitive version is available at https://doi.org/10.1088/1361-6560/ab41db
Keywords and Phrases
Cross Sections; Heavy Ion Collisions; Radiotherapy; Single And Multiple Ionization; Water
International Standard Serial Number (ISSN)
Article - Journal
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01 Oct 2019