Observation of dissociative recombination of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msubsup><mml:mrow><mml:mi mathvariant="normal">Ne</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow><mml:mrow><mml:mo>+</mml:mo></mml:mrow></mml:msubsup></mml:mrow></mml:math>and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msubsup><mml:mrow><mml:mi mathvariant="normal">Ar</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:

Ramos, G.; Schlamkowitz, M; Sheldon, J. W.; Hardy, K.A.; Peterson, J. R.

doi:10.1103/physreva.51.2945

Cited by 34 publications

(32 citation statements)

References 15 publications

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“…The high temperature of the 5 mm-long T-line mode discharge is partially due to slow heat conduction through the relatively long distance from the plasma's core to the ground electrode. There is also believed to be considerable heat generation from sources other than ion Joule heating such as e-Ar momentum transfer or e-Ar + 2 dissociative recombination which couple kinetic energy to Ar atoms in atmospheric discharges [39].…”

Section: Resultsmentioning

confidence: 99%

Instability control in microwave-frequency microplasma

Miura

Hopwood

2012

Eur. Phys. J. D

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Abstract. Atmospheric argon microplasmas driven by 1.0 GHz power were studied by microwave circuit analyses and spatially-resolved optical diagnostics. These studies illuminate the mechanisms responsible for microplasma stability. A split-ring resonator (SRR) microplasma source is demonstrated to reflect excess microwave power, preventing the ionization overheating instability while limiting electron density to approximately 1 × 10 14 cm −3 and OH rotational temperature to 760 K at 0.76 W. Providing the SRR microplasma with an electrical path to ground, however, allows the microplasma to transition from the SRR mode to the so-called transmission line mode (T-line). This transition is due to matching of the microplasma and transmission line impedances. The higher power T-line mode supports a more intense microplasma with electron density of 1 × 10 15 cm −3 and OH rotational temperature of 1480 K with 15 W absorbed power. While the SRR mode is optimized for ignition and sustaining a stable nonequilibrium plasma, and T-line mode is better suited for driving a hot, high density microplasma. The estimated microwave discharge voltages were 15 V and 35 V in SRR mode and T-line mode, respectively, and the voltages are rather independent of input power. Microplasma stability is due to a combination of impedance mismatching and direct control of power, both inherent to microwave circuitry.

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Section: Resultsmentioning

confidence: 99%

Instability control in microwave-frequency microplasma

Miura

Hopwood

2012

Eur. Phys. J. D

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“…Barrios et al [4] have found that a significant number of excited argon atoms in the 4s state are also produced. Also, an undetermined non-negligible fraction (Ramos et al [5,6]) of the dissociative recombination events would yield two argon gas atoms in the ground state. These new results were obtained using a time of flight technique, which makes possible the direct measurement of the kinetic energy of the dissociation products.…”

Section: Introductionmentioning

confidence: 97%

Electron Temperature Dependence of the Dissociative Recombination Coefficient of Molecular Argon Ions Ar⁺₂ with Electrons

Mikuš

Morva

Zábudlá

et al. 2010

Contrib. Plasma Phys.

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Key words Stationary afterglow plasma, microwave diagnostics of plasma, electron heating with microwaves, dissociative recombination, electron temperature dependence of recombination, molecular argon ions.A dual mode (T M 010 cylindrical cavity/cylindrical waveguide) microwave apparatus is used to study the ion mobility and dissociative recombination of molecular argon ions with electrons in the afterglow period of a d.c. glow discharge as a function of electron temperature when electrons were heated by microwaves up to Te ≤ 10300 K, with T+ = Tgas = 300 K. The electron temperature dependence of the total rate coefficient of dissociative recombination may be represented by α(Arwhich is in very good agreement with most previous experimental results but not with the recent theoretical calculations.

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“…We have previously reported on our observations of the ground-state products of DR of Nq+ [14]. This report will deal with final-state products other than the ground state.…”

Section: Discussion Of Observed Product Statesmentioning

confidence: 99%

“…9, a We have observed 19 final product states of the DR reaction of Nqf. We have previously [14] reported the unexpected observation of ground-state products. Our results do not disagree with the earlier investigations [4-91 that used optical methods and were not able to detect the 3s.…”

Section: Discussion Of Observed Product Statesmentioning

confidence: 99%

“…VDR is measured directly by the TOF method. We have shown previously [14] that the DR atom flux dj is given in time space by In this expression c is a constant related to the flux of atoms from a particular trartsition, L is the flight path length, t is the time of flight, VD, is the velocity of the product atom, and V, is the most probable velocity of the velocity distribution of the parent Nea+ ions, which is assumed to be a Maxwellian velocity distribution.…”

Section: Time-of-flight Methodsmentioning

confidence: 99%

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Dissociative-recombination product states and the dissociation energy D0 of Ne2+

Ramos¹,

Sheldon²,

Hardy³

et al. 1998

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Final product states of NQ+ dissociative recombination were studied using time-of-flight spectroscopy to determine the kinetic energies released. The dissociative recombination occurred in a sustained discharge in the presence of a variable magnetic field and discharge voltage, at pressures of 5-15 mTorr. Under different conditions various excited states were observed ranging from the lowest 3s metastable states to higher Rydbcrgstates within 0.000 54 eV of the dissociation limit. From their narrow widths, it is deduced that these higher states arose from Nqf ions with subthermal energies. From two of these narrow distributions, we obtain an improved value for the dissociation limit D,(Ne,+)=1.26%0.02 eV. [S1050-2947(97)01109-S] PACS number(s): 34.50.-s

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Observation of dissociative recombination ofNe2+andAr2

Cited by 34 publications

References 15 publications

Instability control in microwave-frequency microplasma

Instability control in microwave-frequency microplasma

Electron Temperature Dependence of the Dissociative Recombination Coefficient of Molecular Argon Ions Ar⁺₂ with Electrons

Dissociative-recombination product states and the dissociation energy D<sub>0</sub> of Ne<sub>2</sub><sup>+</sup>

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Observation of dissociative recombination ofNe2+andAr2

Cited by 34 publications

References 15 publications

Instability control in microwave-frequency microplasma

Instability control in microwave-frequency microplasma

Electron Temperature Dependence of the Dissociative Recombination Coefficient of Molecular Argon Ions Ar+2 with Electrons

Dissociative-recombination product states and the dissociation energy D<sub>0</sub> of Ne<sub>2</sub><sup>+</sup>

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Electron Temperature Dependence of the Dissociative Recombination Coefficient of Molecular Argon Ions Ar⁺₂ with Electrons