Year: 2026
Type: article
Abstract: Recent discoveries of electron-induced coherence in both resonant and non-resonant interactions have introduced new perspectives in the field. In non-resonant processes, coherence has been observed in dipolar dissociation, where electron-induced excitation forms a coherent superposition of states of opposite parities, resulting in asymmetry in the angle-differential cross-section of the process relative to the incident electron beam. Notably, an isotope effect has been observed in D 2 at 50 eV, where heavier isotopes exhibit diminished asymmetry due to their longer dissociation times. Here, we report the isotope effect on quantum coherence in D 2 across different electron energies. Additionally, we investigate the role of coherence in the isotopologue. Our findings reveal that the asymmetric masses in HD do not influence electron-impact excitation, leading to similar asymmetry in the angular distributions of H − and D − ions. This observation is explained by the homonuclear-like behavior of HD within the Franck-Condon region.
Authors: Akshay Kumar, Vaibhav S Prabhudesai
Institution: Tata Institute of Fundamental Research
Topic: Atomic and Molecular Physics
Subfield: Atomic and Molecular Physics, and Optics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: hybrid
Estimated APC paid: $3,325
Award: G3752552830
OpenAlex ID: W7167049338
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