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Abstract:
The dependence of triply differential cross sections on the internuclear distance R is explored
for ionization of molecular hydrogen by 200 eV electrons for two distinct values R = 1.1 and
1.4 au in comparison with helium as an isoelectronic system with a single nucleus (R = 0).
A clear and systematic trend is observed with an increasing recoil-peak contribution with
decreasing R. BBK-type model calculations indicate that the inclusion of the passive electron
in the target wavefunction is the key ingredient for explaining the data rather than the
two-centre character of the system.
