Title/Qualifications: Dr. /Ph. D.
Department/Unit/Section: Physics
Contact Address: Dept. of Physics, Kenyatta University, Nairobi, Kenya
Position: Associate Professor
Area of Specialization: Atomic Collision Physics
Research Interests: Atomic Collisions

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Google Scholar: https://scholar.google.com/citations?user=F13ilOQAAAAJ&hl=en&oi=ao

ORCID: https://orcid.org/0000-0002-7698-5817

Publications

• Positron impact excitation of lowest autoionizing state of potassium atom using distorted wave method with absorption and polarization potentials N. N. William, E. O. Jobunga and C. S. Singh Journal of Physics Communication 5, 025006 (2021)
• Excitation of cesium atom to the lowest autoionizing level by positron impact A. W. Munywoki, J. Okumu and C. S. Singh African Journal of Pure and Applied Sciences 2, 77 (2021)
• Effect of exchange and absorption potential in the distorted wave calculation of electron impact excitation of autoionizing state of caesium A. A. Ochieng, J. Okumu and C. S. Singh 11 African Journal of Pure and Applied Sciences 1, 39 (2020)
• (Elastic scattering of electron by barium atom using distorted wave method J. N. Kago, J. Okumu and C. S. Singh African Journal of Pure and Applied Sciences 1, 33 (2020)
• Distorted wave Born and optical potential calculations for electron-sodium elastic scattering cross-section at intermediate energies P. K. Kariuki, J. Okumu and C. S. Singh African Review of Physics 10, 131 (2015)

• Calculation of cross section for elastic scattering of electrons at intermediate energies by magnesium atom P. K. Kariuki, J. Okumu and C. S. Singh African Review of Physics 9, 39 (2014)

• E. Jobunga, J. Okumu and C. S. Singh, 2012, Excitation cross section evaluation for the lowest autoionizing state of potassium    African Review of Physics 7, 0001 (2012)
• J. M. Linturi, J. Okumu and C. S. Singh, 2011, A distorted wave method applied to study the 2 3P excitation of helium atom by electron impact, Indonesian Journal of Physics 22, 35 (2011)
• E. Jobunga, J. Okumu and C. S. Singh, 2010, Electron impact excitation of the lowest autoionizing states of sodium using distorted wave method, African Journal of Science and Technology 11, 24 (2010)

• Distorted wave Born and Optical potential calculations for electron – sodium elastic scattering at intermediate energies
  P. K. Kariuki, J. Okumu and C. S. Singh
  African Review of Physics 10, 131 (2015)

Conference Presentations

• Electron impact excitation of the lowest autoionizing state of potassium using distorted wave method Belfast, U. K.    July27 - August 2, 2011
• Electron impact excitation of 2 1S state of helium atom.Freiburg, Germany, July 25-31, 2007