We have measured and calculated fully differential cross sections (FDCS) for ionization of helium by 75-keV proton impact. Ejected electrons with a speed close to and above the projectile speed were investigated. This range of kinematics represents a largely unexplored regime. A high sensitivity of the FDCS to the details of the description of the few-body dynamics, reported earlier for ionization of H2, was confirmed. A peak structure was found in an electron angular range between the regions where the so-called binary and recoil peaks are usually observed. The need for nonperturbative calculations using a two-center basis set is demonstrated.
M. Dhital and S. Bastola and A. Silvus and B. R. Lamichhane and E. Ali and M. F. Ciappina and R. A. Lomsadze and A. Hasan and D. H. Madison and M. Schulz, "Target Dependence of Postcollision Interaction Effects on Fully Differential Ionization Cross Sections," Physical Review A, vol. 100, no. 3, American Physical Society, Sep 2019.
The definitive version is available at https://doi.org/10.1103/PhysRevA.100.032707
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16 Sep 2019