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We show that two-particle interferences can be used to probe the nuclearmotion in a doubly-excited hydrogen molecule. The dissociation of molecularhydrogen by electron impact involves several decay channels, associated todifferent molecular rotational states, which produce quantum interferences inthe detection of the atomic fragments. Thanks to the correlations between theangular momentum and vibrational states of the molecule, the fragments arisingfrom each dissociation channel carry out a phase-shift which is a signature ofthe molecule rotation. These phase-shifts, which cannot be observed in asingle-atom detection scheme, may be witnessed in realistic experimentalconditions in a time-of-flight coincidence measurement. We analyse theinterferences arising from the two lowest-energy rotational states of apara-hydrogen molecule. Our result shows the relevance of two-fragmentscorrelations to track the molecular rotation.

Interference effects due to nuclear motion of the hydrogen molecule