Isotopic and vibrational-level dependence of H2 dissociation by electron impact

Scarlett, Liam H.; Fursa, Dmitry V.; Knol, Jack; Zammit, Mark Christian; Bray, Igor

doi:10.1103/physreva.103.l020801

Title: Isotopic and vibrational-level dependence of H 2 dissociation by electron impact

Journal Article · 19 February 2021 · Physical Review A

DOI: https://doi.org/10.1103/physreva.103.l020801 · OSTI ID:1856154

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Curtin Univ., Perth, WA (Australia)
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

The low-energy electron-impact dissociation of molecular hydrogen has been a source of disagreement between various calculations and measurements for decades. Excitation of the ground state of H₂ into the dissociative b³$$Σ$$$$$^{+}_{u}$$ state is now well understood, with the most recent measurements being in excellent agreement with the molecular convergent close-coupling (MCCC) calculations of both integral and differential cross sections [Zawadzki et al., Phys. Rev. A 98, 062704 (2018)]. However, in the absence of similar measurements for vibrationally excited or isotopically substituted H₂, cross sections for dissociation of these species must be determined by theory alone. We have identified large discrepancies between MCCC calculations and the recommended R-matrix cross sections for dissociation of vibrationally excited H₂, D₂, T₂, HD, HT, and DT [Trevisan et al., Plasma Phys. Contr. Fusion 44 1263 (2002); Plasma Phys. Contr. Fusion 44, 2217 (2002)], with disagreement in both the isotope effect and dependence on initial vibrational level. Furthermore, we investigate the source of the discrepancies, and discuss the consequences for plasma models, which have incorporated the previously recommended data.

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Research Organization:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: 89233218CNA000001

OSTI ID:: 1856154

Report Number(s):: LA-UR-20-29938; TRN: US2305079

Journal Information:: Physical Review A, Vol. 103, Issue 2; ISSN 2469-9926

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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