Penning ionization is a fundamental collision process between two neutral species. One of the atoms or molecules is electronically excited so that the whole system is above the ionization threshold, resulting in an auto-ionization process. The ionization width of the process is calculated using a combination of algebraic diagrammatic construction, Stieltjes imaging, Davidson and Lanczos diagonalization algorithms. This project is motivated by an observation of Penning ionization at sub-kelvin temperatures (see the link below).
http://www.sciencemag.org/content/338/6104/234.full.pdf
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