Time-Dependent Studies of Vacuum-Ultraviolet Emissions from Helium

Bartell, D. M.; Hurst, G. S.; Wagner, E.B.

doi:10.1103/physreva.7.1068

Cited by 47 publications

(8 citation statements)

References 34 publications

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“…For rare gases most of the oscillator strength lies in the continuum; note in Fig. 1 [12] under the direct proton effect the dominant role of ionization compared with excitation.…”

Section: Generalmentioning

confidence: 99%

Light Production and Gaseous Detectors

Policarpo

1981

Phys. Scr.

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Gaseous media may efficiently convert into photons the energy losses of particles and the energy supplied by electric fields to drifting electrons. Some mechanisms associated with the process of light production, in particular the two continua and a few energy transfer phenomena, are considered. The relevance of these processes to control the spectral distribution of the photons, and consequently to its detection, and their interest for the time characteristics and the energy resolution capabilities of detecting devices are also referred to. A few examples are presented of instrumental results that either reflect important characteristics of gas scintillation counters, or point to further possible developments, as regards energy, time and position resolutions.

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“…For rare gases most of the oscillator strength lies in the continuum; note in Fig. 1 [12] under the direct proton effect the dominant role of ionization compared with excitation.…”

Section: Generalmentioning

confidence: 99%

Light Production and Gaseous Detectors

Policarpo

1981

Phys. Scr.

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“…These excimers can be created with the help of various excitation sources (charged particle beams, synchrotron radiation, etc. ), and their decay produces photons in the VUV region, forming two intense continua observed long ago for all RGs (except Rn) [4,5,6,7,8] (see also [9,10] for the recent Ne and He data).…”

Section: Introductionmentioning

confidence: 87%

Potential energy curves and transition moments for the excimer states 0u+ (3P1) and 1u (3P2) of Ar2

Selg

2007

Preprint

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“…( 1)-( 4) and a surface reaction for He * ) is enough to have a good comparison with measurements. However, a more detailed reaction set would probably provide an even better comparison, especially close to transition from α-γ to γ mode; He excimer species, may be important in Penning ionization [117,118] in pure He discharges. Additionally, nitrogen impurities may also be present in the experiment, inducing a shift of the measured PV characteristic to the right [20].…”

Section: Power-voltage Characteristicsmentioning

confidence: 99%

Predicting power–voltage characteristics and mode transitions in the COST reference microplasma jet

Mouchtouris

Kokkoris²,

Boudouvis³

2022

J. Phys. D: Appl. Phys.

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A 2D cross-field plasma fluid model (CFPM) is applied to He and He/O2 discharges in the COST reference microplasma jet to investigate the operating modes, namely α-, α-γ, and γ-mode. The model not only captures the measured spatiotemporal behavior of He excitation to He metastable but also quantitatively predicts measured power – voltage (PV) characteristics for He/O2 discharges; although not addressed by previous studies, this is a prerequisite for the reliability of the model predictions for the critical-for-applications densities of reactive species. Through a comparison to time-averaged emission profiles and allowed by the dimensionality of the CFPM, the localized, close to the outlet of the discharge channel, onset of γ-mode for He discharges is predicted and justified. Τhe sheath boundary is defined by the maximum of the electron density derivative and the model results compare well to measurements of time-averaged sheath width. Criteria for the transition between the operating modes are formulated. It is considered that when the production rate of He metastable in the sheaths reaches 10% of its total production rate, transition from α- to α-γ mode takes place. When this percentage reaches ~50%, i.e. α- and γ- modes have an almost equal contribution to the discharge, the electron temperature becomes maximum. Finally, the sensitivity of PV characteristics on the secondary electron emission coefficients, condition of the electrode surface, and fabrication or assembly mishits of the COST jet, is investigated.

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Time-Dependent Studies of Vacuum-Ultraviolet Emissions from Helium

Cited by 47 publications

References 34 publications

Light Production and Gaseous Detectors

Light Production and Gaseous Detectors

Potential energy curves and transition moments for the excimer states 0u+ (3P1) and 1u (3P2) of Ar2

Predicting power–voltage characteristics and mode transitions in the COST reference microplasma jet

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