Few-Body Atomic Collisions

Atomic collisions provide key insights into one of the most fundamental forces of nature – the Coulomb force. The study of atomic collisions is primarily used to understand the dynamics of charged particle interactions, but is vital to other areas of physics, such as plasma physics, astrophysics, and biophysics.

Experimental advancements now allow for highly detailed measurements, and these new results are proving quite challenging for theory. Dr. Harris’s research uses state-of-the-art high performance computing techniques to model various collision processes.

few body graph

Double differential cross section measurements and predictions for proton-impact single ionization of methane using an artificial neural network.
Eur. Phys. J. D. 67, 130 (2013)

Recent Publications

A. L. Harris and T. P. Esposito, "Correlation Effects in Out-of-Plane Excitation-Ionization Collisions", submitted to Phy. Rev. Lett., 6-23-14.

A. L. Harris and D. H. Madison, "Effect of Reference Frame on the Scaling of Electron Capture Fully Differential Cross Sections", submitted to Phys. Rev. A, 6-5-14.

E. Ali, A. L. Harris, J. Lower, E. Weigold, C. G. Ning, and D. H. Madison, "Fully differential cross sections for electron impact excitation-ionization of aligned D2", accepted to Phys. Rev. A. 5-30-14.

J. C. A. Lower, E. Ali, S. Bellm, E. Weigold, A. L. Harris, C. G. Ning, D. H. Madison, "Experimental and Theoretical Cross Sections for Molecular-Frame Electron-Impact Excitation-Ionization of D2", Phys. Rev. A 88, 062705 (2013).

A. L. Harris and K. Morrison, "Comprehensive study of 3-body and 4-body models of single ionization of helium", J. Phys. B: At. Mol. Opt. Phys. 46, 145202 (2013).

A. L. Harris and J. A. Darsey, "Applications of Artificial Neural Networks to Proton-Impact Double Differential Cross Sections", Eur. Phys. J. D. 67, 130 (2013).

U. Chowdhury, A. L. Harris, J. L. Peacher, and D. H. Madison, "Post Collision Interactions in Fully Differential Cross Sections for Four-Body Charge Transfer Processes." J. Phys. B: At. Mol. Opt. Phys. 45, 175204 (2012).

U. Chowdhury, A. L. Harris, J. L. Peacher, and D. H. Madison, "Four body Charge Transfer Processes in Proton Helium Collisions." J. Phys. B: At. Mol. Opt. Phys. 45, 035203 (2012).

A. L. Harris, B. Milum, and D.H. Madison, "Indistinguishability in electron impact excitation-ionization of helium." Phys. Rev. A 84, 052718 (2011).