Complete collision data set for electrons scattering on molecular hydrogen and its isotopologues: II. Fully vibrationally-resolved electronic excitation of the isotopologues of H2
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Scarlett, Liam H.; Fursa, Dmitry; Zammit, Mark C.; Bray, Igor; Ralchenko, Yuri

doi:10.1016/j.adt.2020.101403

Cited by 13 publications

(2 citation statements)

References 32 publications

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“…The modelling necessarily includes electron impact ionization (EII), excitation (EIE), dissociation (EID), dissociative attachment of electrons to vibrational states H 2 (v), excitation and de-excitation of rovibrational states of H 2 and their vibrational-translational (V-T) and rotational-translational (R-T) relaxations, associative ionization and detachment, ion conversion and electronion recombination reactions, and a few important reactions involving electronically excited species [52,53]. The used electron scattering cross-sections on the H 2 ground state in this paper are close to the recently improved H 2 cross-sections in the Scarlett et al series of papers [54][55][56][57]. For the processes of electron state excitation, dissociation and ionization from the vibrationally excited states, the cross-sections of the corresponding processes from the ground state with threshold shift are used in our model.…”

Section: Model Descriptionsupporting

confidence: 76%

“…For the processes of electron state excitation, dissociation and ionization from the vibrationally excited states, the cross-sections of the corresponding processes from the ground state with threshold shift are used in our model. We have evaluated the effect of this cross-section threshold shift without the cross-section absolute value increase shown in [54][55][56][57]. The whole effect of crosssection threshold shift and amplitude increase gives about 2% increase in dissociation rate, about 2.5% increase in the rate of the lowest bound electron state B 1 Σ u + excitation and 1.4% increase in the ionization rate.…”

Section: Model Descriptionmentioning

confidence: 99%

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H⁻ production in hydrogen DC glow discharge

Lopaev,

Mankelevich,

Kropotkin

et al. 2024

Plasma Sources Sci. Technol.

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H- ion dynamics in the positive column of H2 dc glow discharge was studied by the laser photodetachment technique in a wide range of pressure, 0.1–3 Torr, and current, 1-30 mA which cover a range of E/N from ~ 40 Td up to ~ 170 Td. Using partial modulation of discharge current it is shown that the H– concentration follows H atom dynamics due to fast detachment reaction with the atoms: the higher H density, the lower H-/ne ratio. Dynamics of H atom density at discharge modulation was measured by the time-resolved actinometry on Ar atoms while H2vibrational temperature was estimated by comparing measured and simulated H2 VUV absorption spectra. The analysis of the experimental dependencies of H– and H/H2 on the discharge parameters allowed estimating the effective rate constant of H– production in the discharge as a function of the reduced electric field. For this the discharge model including self-consistently state-to-state vibrational kinetics as well as H2 highly excited electronic states was developed. The main processes, that contribute to H– production and loss, are discussed in detail. Dissociative attachment to vibrationally excited H2(v) molecules is the main channel of H- production but occurs via the excitation of the well-known low-energy (εth ≈ 3 eV) shape resonance of H2-(X2Σu+) only at low E/N. At high E/N, the H- production mostly occurs via the excitation of the high-energy H2- states, such as H2-(B2Σg+, A2Σg+, C2Πu) and Feshbach resonances similar to H2-(2Σg+) Rydberg state.

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Section: Model Descriptionsupporting

confidence: 76%

Section: Model Descriptionmentioning

confidence: 99%

H⁻ production in hydrogen DC glow discharge

Lopaev,

Mankelevich,

Kropotkin

et al. 2024

Plasma Sources Sci. Technol.

View full text Add to dashboard Cite

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Complete collision data set for electrons scattering on molecular hydrogen and its isotopologues: III. Vibrational excitation via electronic excitation and radiative decay

Scarlett

Boyle

Zammit

et al. 2022

Atomic Data and Nuclear Data Tables

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A direct Monte Carlo approach for the modeling of neutrals at the plasma edge and its self-consistent coupling with the 2D fluid plasma edge turbulence model HESEL

Kvist,

Thrysøe,

Haugbølle

et al. 2024

Physics of Plasmas

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This paper presents a novel coupling of a kinetic description of neutrals with a fluid description of a fusion plasma. The code, plasma interacting super-atoms and molecules (PISAM), employs a grid-free Cartesian geometry and a direct simulation Monte Carlo approach to solve the kinetic equations of deuterium atoms and molecules. The grid-free geometry and the parallel nature of the neutral dynamics, in the absence of neutral–neutral interactions, allow for an unlimited and work-efficient parallelization of PISAM that always ensures a balanced workload. The highly optimized Python implementation obtains good performance while securing easy accessibility to new users. The coupling of PISAM with the edge turbulence model HESEL is outlined with emphasis on the technical aspects of coupling Message Passing Interface-parallelized Python and C++ codes. Furthermore, the paper presents and analyzes simulation results from running the coupled HESEL-PISAM model. These results demonstrate the impact of radial neutral transport and plasma–neutral dynamics perpendicular to the magnetic field. Specifically, they illustrate how the inward flow of neutral kinetic energy and the inhibition of radial electric shear, resulting from poloidal momentum transfer between atoms and ions, can affect the energy containment time. By comparing the results of the HESEL-PISAM model with those obtained from coupling HESEL with a diffusive-fluid-neutral model, the capabilities of diffusion models in predicting neutral transport in the plasma edge and scrape-off layer are elucidated.

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Complete collision data set for electrons scattering on molecular hydrogen and its isotopologues: II. Fully vibrationally-resolved electronic excitation of the isotopologues of H2 (X1Σg

Cited by 13 publications

References 32 publications

H⁻ production in hydrogen DC glow discharge

H⁻ production in hydrogen DC glow discharge

Complete collision data set for electrons scattering on molecular hydrogen and its isotopologues: III. Vibrational excitation via electronic excitation and radiative decay

A direct Monte Carlo approach for the modeling of neutrals at the plasma edge and its self-consistent coupling with the 2D fluid plasma edge turbulence model HESEL

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Complete collision data set for electrons scattering on molecular hydrogen and its isotopologues: II. Fully vibrationally-resolved electronic excitation of the isotopologues of H2 (X1Σg

Cited by 13 publications

References 32 publications

H− production in hydrogen DC glow discharge

H− production in hydrogen DC glow discharge

Complete collision data set for electrons scattering on molecular hydrogen and its isotopologues: III. Vibrational excitation via electronic excitation and radiative decay

A direct Monte Carlo approach for the modeling of neutrals at the plasma edge and its self-consistent coupling with the 2D fluid plasma edge turbulence model HESEL

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Product

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H⁻ production in hydrogen DC glow discharge

H⁻ production in hydrogen DC glow discharge