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dc.contributor.authorNoah Nzeki William
dc.contributor.authorEric Ouma Jobunga
dc.contributor.authorChandra Shekhar Singh
dc.date.accessioned2022-03-28T07:50:26Z
dc.date.available2022-03-28T07:50:26Z
dc.date.issued2021-01-26
dc.identifier.citationNoah Nzeki William et al 2021 J. Phys. Commun. 5 025006en_US
dc.identifier.urihttps://ir.tum.ac.ke/handle/123456789/17447
dc.description.abstractDifferential and integral cross-sections, as well as the alignment and lambda parameters for positron impact excitation of the lowest autoionizing state of potassium atom, have been calculated using a non-relativistic distorted wave method in the energy range of 18.9–1500 eV. The distortion potential in the initial and final channel state comprises a linear combination of static potential plus polarizationand absorption potentials. The approximate Roothan-Hartree–Fock (RHF)wavefunctionsMulti zeta wavefunctions given by Clementi and Roetti have been used. The inclusion of polarization and absorption potentials has improved integral cross-section and alignment parameter results. The integral cross sections have shown the near threshold resonance structure revealed in electron impact excitation experimental results. Differential cross-section and lambda parameter results have been calculated and presented for future comparison since there are no other results available in the literature for positron impact excitation.en_US
dc.language.isoenen_US
dc.publisherJournal of Physics Communicationsen_US
dc.relation.ispartofseriesJ. Phys. Commun.;5 (2021) 025006
dc.subjectPositronen_US
dc.subjectPotassiumen_US
dc.subjectlowest autoionizing stateen_US
dc.subjectDistortion potentialen_US
dc.subjectDistorted waveen_US
dc.subjectCross-sectionen_US
dc.titlePositron impact excitation of lowest autoionizing state of potassium atom using distorted wave method with absorption and polarization potentialsen_US
dc.typeArticleen_US


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