Cross Section Data for Electron-Impact Inelastic Processes of Vibrationally Excited Molecules of Hydrogen and Its Isotopes

Celiberto, R.; Janev, R.K.; Laricchiuta, Annarita; Capitelli, M.; Wadehra, J. M.; Atems, D. E.

doi:10.1006/adnd.2000.0850

Cited by 217 publications

(200 citation statements)

References 29 publications

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“…, (13) where α e,H 2 , α H + ,H -and α e,H -are the rate coeffi cients for dissociative attachment (DA), mutual neutralization (MN) and electron impact detachment (EDet), respectively [64][65][66]. We assumed in the equation that the vibrational distribution of H 2 in the ground electronic state is Boltzmann, namely that it can be characterized by T vib , and that the MN rates for H 2 + and He + are equal to that of H + .…”

Section: Study Of Hydrogen-mar Processesmentioning

confidence: 99%

Diagnostics of Recombining Plasmas in Divertor Simulator MAP-II

Kado

Iida

Kajita

et al. 2005

J. Plasma Fusion Res.

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Atomic and molecular processes in volumetric recombination phenomena relevant to divertor detachment are investigated in a divertor simulator MAP (Material and Plasma) -II. In the recombining plasmas, quantitative measurements of parameters, especially using a Langmuir probe, are diffi cult, so that the development of alternative diagnostics is important. Recombination can be induced in He plasma by puffi ng of He or H 2 . In the He puffi ng case, the Rydberg spectra show an electron temperature of lower than 0.1 eV, while in the H 2 puffi ng case, the Rydberg spectra disappear even though the reduction of the ion fl ux is apparent, showing that another type of recombination occurs. Negative hydrogen ions are observed in the peripheral region of the plasma column.

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Section: Study Of Hydrogen-mar Processesmentioning

confidence: 99%

Diagnostics of Recombining Plasmas in Divertor Simulator MAP-II

Kado

Iida

Kajita

et al. 2005

J. Plasma Fusion Res.

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“…It has been argued that the main dissociation channel of the molecules in hydrogen discharges is electronic excitation to triplet states eventually decaying to repulsive b 3 Σ + u -state. 15 The cross section for the triplet excitation peaks below 20 eV electron energy 14 and exceeds the molecular ionization cross section at energies <25 eV. Typical electron temperature in the 2.45 GHz microwave discharge has been measured to be 5-18 eV, 16 i.e., it can be argued that most electron impact processes lead to dissociation of the hydrogen molecule and further ionization to H + , which would explain the significant fraction of atomic ions in e + H → H + + 2e.…”

Section: Discussionmentioning

confidence: 99%

The relationship between visible light emission and species fraction of the hydrogen ion beams extracted from 2.45 GHz microwave discharge

Cortázar

Megía-Macías

Tarvainen

et al. 2015

Review of Scientific Instruments

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The relationship between Balmer-α and Fulcher-band emissions with extracted H+, H2+, and H3+ ions is demonstrated for a 2.45 GHz microwave discharge. Ion mass spectra and optical measurements of Balmer-α and Fulcher-band emissions have been obtained with a Wien Filter having an optical view-port on the plasma chamber axis. The beam of approximately 1 mA is analyzed for different plasma conditions simultaneously with the measurement of light emissions both with temporal resolution. The use of visible light emissions as a valuable diagnostic tool for monitoring the species fraction of the extracted beams is proposed.

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“…For the sake of comparison, however, we also look at the DEA cross sections and rates, for all isotopes of H 2 , involving the X 2 + u shape resonance which are available in previous papers [18,19]. The isotope effect is much more pronounced for the case involving the X 2 + u shape resonance than the case involving the Rydberg 2 + g resonance.…”

Section: Rate Coefficientsmentioning

confidence: 99%

Cross sections for 14-eVe-H2resonant collisions: Isotope effect in dissociative electron attachment

et al. 2011

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Celiberto R, Janev RK, Wadehra JM, Laricchiuta A. Cross sections for 14-eV e-H2 resonant collisions: Isotope effect in dissociative electron attachment. Phys. Rev. A. 2011;84(1) The process of dissociative attachment of electrons to molecular hydrogen and its isotopes in the energy range at approximately 14 eV is investigated. The dissociative electron attachment cross sections for all six hydrogen isotopes are calculated over an extended range of electron energies using the local complex potential model with the excited Rydberg 2 + g electronic state of H 2 − acting as the intermediate resonant state. A significant isotope effect in theoretical electron attachment cross sections is observed, in agreement with previous predictions and experimental observations. A two-parameter analytic expression for the cross section is derived from the theory that fits accurately the numerically calculated cross sections for all isotopes. Similarly, an analytic mass-scaling relation is derived from the theory that accurately reproduces the numerically calculated rate coefficients for all isotopes in the 0.1-1000 eV temperature range by using the rate coefficient for the H 2 isotope only. The latter is represented by an analytic fit expression with two parameters only.

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Cross Section Data for Electron-Impact Inelastic Processes of Vibrationally Excited Molecules of Hydrogen and Its Isotopes

Cited by 217 publications

References 29 publications

Diagnostics of Recombining Plasmas in Divertor Simulator MAP-II

Diagnostics of Recombining Plasmas in Divertor Simulator MAP-II

The relationship between visible light emission and species fraction of the hydrogen ion beams extracted from 2.45 GHz microwave discharge

Cross sections for 14-eVe-H2resonant collisions: Isotope effect in dissociative electron attachment

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