Kinetic studies of ionic excimers

Schumann, M.; Langhoff, H.

doi:10.1063/1.467399

Cited by 15 publications

(4 citation statements)

References 29 publications

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“…For argon/hydrogen and argon/nitrogen mixtures (figures 2(b) and (c), respectively), the argon dimer second continuum emission (125 nm region) [29,30] and argon dimer third continuum emission (190 nm region) [31,32] are present (see table 1). Three-body collisions involving Ar atomic metastables favour the formation of excimers Ar * 2 at our relatively high gas densities [25].…”

Section: Optical Emission Spectra In the 110-200 Nm Regionmentioning

confidence: 98%

Absolute UV and VUV emission in the 110–400 nm region from 13.56 MHz driven hollow slot microplasmas operating in open air

Rahman

Yalin

Surla

et al. 2004

Plasma Sources Sci. Technol.

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We present absolute optical emission spectra in the 110-400 nm regions from radio-frequency-driven (13.56 MHz) hollow slot microplasmas operating in open air at atmospheric pressure. The term microplasma in our research refers to inter-electrode separation (100-600 µm) only, as electrode lengths are scalable from 1 to 30 cm. This creates an extended slot plasma and an associated afterglow plume as described herein. Spectra are presented for gas flows through the microelectrodes of argon and helium with small admixtures of hydrogen and nitrogen into open air. The spectra are discussed in terms of species origin and magnitude of the dominant emission lines. Atomic O and N lines dominate the 110-200 nm region, whereas, in the 200-400 nm region, NO, N 2 , N + 2 and NH molecular lines are strongest. The role of the N 2 (A 3 + u ) state in the open air microplasmas is discussed and the second positive system of molecular nitrogen (N 2 (C 3 g -B 3 g )), is used to measure the rotational (gas) temperature. Finally, we compare the efficiency and magnitude of light emission from the open air microplasmas with values attainable from commercial sealed mercury lamps in the UVB and UVC regions.

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Section: Optical Emission Spectra In the 110-200 Nm Regionmentioning

confidence: 98%

Absolute UV and VUV emission in the 110–400 nm region from 13.56 MHz driven hollow slot microplasmas operating in open air

Rahman

Yalin

Surla

et al. 2004

Plasma Sources Sci. Technol.

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“…Xe+Cs+M-÷XeCs+M (4) We previously determined the rate constant values for XeCs to 2 .3 10.31 cm6s1 (MXe) and 2. 8* 1031 cm6s' (MAr).…”

Section: Discussionmentioning

confidence: 99%

Kinetics and spectroscopy of alkali rare-gas ionic excimers

Delaporte

Fontaine

Sentís

et al. 2000

International Conference on Atomic and Molecular Pulsed Lasers III

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Many kinetic and spectroscopic studies were performed on alkali rare gas ionic excimer. The main results obtained during these investigations are presented. We observed fluorescence spectra from diatomic and triatomic molecules. Vacuum ultraviolet fluorescence emissions from alkali rare gas ionic excimer molecules were studied in detail by lowenergy electron beam excitation. Measurements were performed as a function of gas composition, gas pressure and deposited energy in order to investigate the kinetic mechanisms of these molecules. The rate constants of the formation and competitive reactions were determined from the observed fluorescence signal decay. Emissions of Ne-Xe-Cs mixtures excited by a pulsed electrical discharge were investigated experimentally as a function of gas pressure and gas composition. No fluorescence correlated to alkali rare gas molecules were observed. Triatomic ionic excimers have also been observed. These molecules have been produced by electron beam excitation. Emission spectra centered at -159nm due to Kr2Cs radiative decay were recorded. Binding energy of the lowest excited state is determined. Two formation channels for these triatomic ions are proposed and their rate coefficients estimated.Keywords: VUV, spectroscopy, kinetic, alkali, rare gas, electron beam, discharge ultraviolet fluorescence emissions from RgA molecules were studied in detail by lowenergy electron beam excitation. Emissions of Ne-Xe-Cs mixtures excited by a pulsed electrical discharge were also investigated experimentally and theoretically. Triatomic ionic excimers (Rg2A) have also been observed and studied. EXPERIMENTAL SETUPA detailed description of the experimental apparatus is given elsewhere'°. In this work only the main features of the set-up necessary for the interpretation of the experimental results are mentioned. The whole device consists of three main parts: The heated cell, the apparatus for the excitation of the gas mixtures in the cell and the optical detection system for spectral and time-resolved investigations on the emitted fluorescence spectra in the VIJV.'

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“…En particulier, l'excitation de mélanges alcalin (A) -gaz rare (Rg) a permis de mettre en évidence les émissions de fluorescence VUV liées aux excimères ioniques Rg + A de 66,5nm (He + Li) à 189,9nm (Xe + Li). Des études cinétiques ont permis d'expliquer les principaux mécanismes intervenant lors de la production et la destruction de la molécule Rg + A [6]- [8].…”

Section: Les Excimeres Ioniquesunclassified

Excimères ioniques triatomiques d'alcalin gaz rare

et al. 1997

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Résumé : Les excimères ioniques triatomiques ont été proposés et observés pour la première fois. L'excitation par faisceau d'électrons de mélanges alcalin (A) gaz rare (Rg) a permis d'observer les émissions de fluorescence dans l'ultraviolet du vide de ces excimères Rg2 + A. Une première approche cinétique a permis de déterminer deux voies de production de ces molécules. LES EXCIMERES IONIQUES

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Kinetic studies of ionic excimers

Cited by 15 publications

References 29 publications

Absolute UV and VUV emission in the 110–400 nm region from 13.56 MHz driven hollow slot microplasmas operating in open air

Absolute UV and VUV emission in the 110–400 nm region from 13.56 MHz driven hollow slot microplasmas operating in open air

Kinetics and spectroscopy of alkali rare-gas ionic excimers

Excimères ioniques triatomiques d'alcalin gaz rare

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