Parametrization of Electron-Impact Ionization Cross Sections from Laser-Excited and Aligned Atoms

Nixon, Kate L. and Murray, Andrew James (2014). Parametrization of Electron-Impact Ionization Cross Sections from Laser-Excited and Aligned Atoms. Physical Review Letters, 112(2), article no. 023202.

DOI: https://doi.org/10.1103/PhysRevLett.112.023202

Abstract

A set of parameters describing electron-impact ionization from laser-aligned atoms are reported, which define the “length”, “width”, and “direction” of the quadruple differential cross section (QDCS) as a function of target alignment k_B for fixed ingoing electron momentum k₀ and outgoing momenta k₁, k₂. 24Mg was used, with k₀, k₁, k₂, and k_B in the same plane. The parameters are derived for a range of k₂ angles, with k₁ set at 30° to k₀. The QDCS is then determined for all k_B. The parameters are very angle sensitive, the QDCS direction varying more than 90° as the length to width ratio varied more than an order of magnitude.

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