Interference effects due to nuclear motion of the hydrogen molecule

Abstract

We show that two-particle interferences can be used to probe the nuclear motion in a doubly-excited hydrogen molecule. The dissociation of molecular hydrogen by electron impact involves several decay channels, associated to different molecular rotational states, which produce quantum interferences in the detection of the atomic fragments. Thanks to the correlations between the angular momentum and vibrational states of the molecule, the fragments arising from each dissociation channel carry out a phase-shift which is a signature of the molecule rotation. These phase-shifts, which cannot be observed in a single-atom detection scheme, may be witnessed in realistic experimental conditions in a time-of-flight coincidence measurement. We analyse the interferences arising from the two lowest-energy rotational states of a para-hydrogen molecule. Our result shows the relevance of two-fragments correlations to track the molecular rotation.

5 pages, 3 Figures. Submitted

References in corpus (4)

• An atomic Hong-Ou-Mandel experiment
• Experimental evidence of twin fast metastable H(2S) atoms from dissociation of cold H_2 induced by electrons
• Potential Energy Curves and Generalized Oscillator Strength for Doubly Excited States of Hydrogen Molecule
• Toward a test of angular momentum coherence in a twin-atom interferometer