Abstract
Bond oscillation, a phenomenon characteristic of the molecular electron-density distribution in momentum space, is demonstrated for the $1{\ensuremath{\sigma}}_{g}$ molecular orbital of ${\mathrm{H}}_{2}$ with an ($e$, $2e$) experiment at large momentum transfer. Analysis of the experimental data in terms of two-center interference effects has revealed that different oscillatory structures can be observed, depending on the model for describing ($e$, $2e$) ionization from the constituent H $1s$ atomic orbitals. It is shown that bond oscillation is highly sensitive to the spatial pattern and chemical bonding nature of the molecular orbital.
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