Time-of-flight electron scattering from molecular hydrogen: Benchmark cross sections for excitation of the X1Σg+→b3Σu+ transition

Zawadzki, Mateusz; Wright, R.; Dolmat, G.; Martin, M. F.; Hargreaves, Leigh; Fursa, Dmitry V.; Zammit, Mark Christian; Scarlett, Liam H.; Tapley, Jonathan K.; Savage, Jeremy S.; Bray, Igor; Khakoo, Murtadha A.

doi:10.1103/PhysRevA.97.050702

Title: Time-of-flight electron scattering from molecular hydrogen: Benchmark cross sections for excitation of the $X^{1} Σ_{g}^{+} \to b^{3} Σ_{u}^{+}$ transition

Journal Article · Thu May 24 00:00:00 EDT 2018 · Physical Review A

DOI:https://doi.org/10.1103/PhysRevA.97.050702· OSTI ID:1524401

Zawadzki, Mateusz ^[1]; Wright, R. ^[2]; Dolmat, G. ^[2]; Martin, M. F. ^[2]; Hargreaves, Leigh ^[2]; Fursa, Dmitry V. ^[3];

^[4]; Scarlett, Liam H. ^[3]; Tapley, Jonathan K. ^[3]; Savage, Jeremy S. ^[3]; Bray, Igor ^[3]; Khakoo, Murtadha A. ^[2]

Gdańsk Univ. of Technology, Gdańsk (Poland)
California State Univ., Fullerton, CA (United States)
Curtin Univ., Perth, WA (Australia)
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

The electron impact $X^{1} Σ_{g}^{+} \to b^{3} Σ_{u}^{+}$ transition in molecular hydrogen is one of the most important dissociation pathways to forming atomic hydrogen atoms, and is of great importance in modeling astrophysical and industrial plasmas where molecular hydrogen is a substantial constituent. Recently, it has been found that the convergent close-coupling (CCC) cross sections of Zammit et al. [Phys. Rev. A 95, 022708 (2017)] are up to a factor of 2 smaller than the currently recommended data. Here, we have determined normalized differential cross sections for excitation of this transition from our experimental ratios of the inelastic to elastic scattering of electrons by molecular hydrogen using a transmission-free time-of-flight electron spectrometer, and find excellent agreement with the CCC calculations. Since there is already excellent agreement for the absolute elastic differential cross sections, we establish benchmark differential and integrated cross sections for the $X^{1} Σ_{g}^{+} \to b^{3} Σ_{u}^{+}$ transition, with theory and experiment being essentially in complete agreement.

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

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

Grant/Contract Number:: 89233218CNA000001; AC52-06NA25396

OSTI ID:: 1524401

Alternate ID(s):: OSTI ID: 1438951

Report Number(s):: LA-UR-18-21161; PLRAAN

Journal Information:: Physical Review A, Vol. 97, Issue 5; ISSN 2469-9926

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 14 works

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