Triple differential cross-sections for near threshold (e, 2e) process for hydrogen

摘要

The triple differential cross-sections for ionization of hydrogen at incident energies in the range 17.6 eV to 13.7 eV are calculated in the distorted-wave Born approximation in the equal energy sharing and V_(ab) = 180° kinematics. It is found that a maximum in the cross-section, as was observed in the case of helium under similar conditions is also found here at excess energy E_(ex) ≤ 1.0 eV. This 'maximum' becomes more pronounced as E_(ex) decreases indicating dominance of short range e-e correlations at these low energies. The angular distribution of the singlet and triplet partial waves and the asymmetry parameter have been analysed.