Resonances in electron scattering from H₂ around the H(2l) + H−(1s²) dissociation limit

Bingham, Peter and Gorfinkiel, Jimena (2024). Resonances in electron scattering from H₂ around the H(2l) + H−(1s²) dissociation limit. Journal of Physics B: Atomic, Molecular and Optical Physics, 57, article no. 105202.

DOI: https://doi.org/10.1088/1361-6455/ad38f3

Abstract

We have performed high-level R-matrix scattering calculations to identify and characterize the resonances potentially involved in dissociative electron attachment (DEA) of H₂ at around 14.5~eV. DEA experiments [Krishnakumar et al. Nat. Phys. 4 (2018) 149] indicate an asymmetric production of H^- around this scattering energy that can only be explained if more than one resonance is involved in the process. The theoretical description of the anion distribution requires accurate data (energy and lifetime) for the resonances involved, currently missing from the literature. We attempt to provide these data for all the resonances identified in the appropriate energy range for bond lengths 1.1~a₀ to 4.0~a₀ . Our resonance results are insufficient to confirm the validity of a simple model of anion yield asymmetry used to reproduce the experimental results.

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