Excessive Doppler broadening of the Hα line in a hollow cathode glow discharge

Šišović, N. M.; Majstorović, G. Lj.; Konjević, N.

doi:10.1140/epjd/e2006-00187-x

Cited by 28 publications

(51 citation statements)

References 26 publications

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“…The reason for the red-shifted component, as discussed in Refs. [3,4] is a result of photon reflection at the wall. In general the emission of photons can be assumed to be isotropic and the photons emitted by neutral atoms could be reflected by the target surface and reach the front optics as well [cf.…”

Section: Resultsmentioning

confidence: 99%

“…The significantly broadened Balmer or Lyman series emitted by hydrogen or deuterium atoms is a highly debated phenomenon observed in the atmosphere of stellar and planetary plasmas [1,2], low temperature plasmas of hollow cathodes [3], radio frequency induction plasmas [4] or microplasma jets at atmospheric pressures [5]. In many cases the presence of noble gases stimulates the emission of hydrogen lines, i.e., either the intensity is increased or the lines become extensively broadened.…”

Section: Introductionmentioning

confidence: 99%

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Emission of fast non-Maxwellian hydrogen atoms in low-density laboratory plasma

Brandt

Marchuk

Pospieszczyk

et al. 2017

AIP Conference Proceedings

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Abstract. The source of strong and broad emission of the Balmer-α line in mixed plasmas of hydrogen (or deuterium) and noble gases in front of metallic surfaces is a subject of controversial discussion of many plasma types. In this work the excitation source of the Balmer lines is investigated by means of optical emission spectroscopy in the plasma device PSI-2. Neutral fast non-Maxwellian hydrogen atoms are produced by acceleration of hydrogen ions towards an electrode immersed into the plasma. By variation of the electrode potential the energy of ions and in turn of reflected fast atoms can be varied in the range of 40 − 300 eV. The fast atoms in front of the electrode are observed simultaneously by an Echelle spectrometer (0.001 nm/channel) and by an imaging spectrometer (0.01 nm/channel) up to few cm in the plasma. Intense excitation channels of the Balmer lines are observed when hydrogen is mixed with argon or with krypton. Especially in Ar-H and Ar-D mixed plasmas the emission of fast hydrogen atoms is very strong. Intermixing hydrogen with other noble gases (He, Ne or Xe) one observes the same effect however the emission is one order of magnitude less compared to Kr-H or Kr-D plasmas. It is shown, that the key process, impacting this emission, is the binary collision between the fast neutral hydrogen atom and the noble gas atom. Two possible sources of excitation are discussed in details: one is the excitation of hydrogen atoms by argon atoms in the ground state and the second one is the process of the so-called excitation transfer between the metastable states of noble gases and hydrogen. In the latter case the atomic data for excitation of Balmer lines are still not available in literature. Further experimental investigations are required to conclude on the source process of fast atom emission.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Emission of fast non-Maxwellian hydrogen atoms in low-density laboratory plasma

Brandt

Marchuk

Pospieszczyk

et al. 2017

AIP Conference Proceedings

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“…The HC tube was 50 mm (Cu) or 100 mm (Ti) long with 6 mm internal diameter and 1 mm wall thickness. The construction details of HC discharge source are described elsewhere [21].…”

Section: Methodsmentioning

confidence: 99%

Spectroscopic study of hydrogen rotational, vibrational and translational temperatures in a hollow cathode glow discharge

Majstorović

2008

J. Phys.: Conf. Ser.

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“…The active species ( fields of gaseous pollution control, organic compounds removal from water, bacterial decontamination, and destruction of other toxic compounds etc. [2][3][4][5][6][7][8][9][10][11][12]. Especially, OH radical plays the crucial role due to its strong oxidation capability [13][14][15], and N þ 2 ðB 2 R þ u Þ ion is important in understanding the mechanism of plasma processing and developing the kinetic model.…”

Section: Introductionmentioning

confidence: 99%

Experimental Research of OH and N 2 + Spatially Resolved Spectra in a Needle-Plate Pulsed Streamer Discharge

Gao

Wang

Liu

et al. 2008

Plasma Chem Plasma Process

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In this study, the spatial distributions of the emission intensity of OH (A 2 R!X 2 P; 0-0) and N þ 2 ðB 2 R þ u ! X 2 R þ g ; 0-0, 391.4 nm) are investigated in the atmospheric pressure pulsed streamer discharge of H 2 O and N 2 mixture in a needle-plate reactor configuration. The effects of pulsed peak voltage, pulsed repetition rate, input power, and O 2 flow rate on the spatial distributions of the emission intensity of OH (, and the vibrational temperature of N 2 (C) in the lengthwise direction from needle to plate are attained. It is found that the emission intensities of OH (A 2 R!X 2 P; 0-0) and N þ 2 ðB 2 R þ u ! X 2 R þ g ; 0-0, 391.4 nm) rise with increasing the pulsed peak voltage, the pulsed repetition rate and the input power, and decrease with increasing O 2 flow rate. In the direction from needle to plate, the emission intensity of OH (A 2 R!X 2 P; 0-0) decreases firstly, and rises near the plate electrode, while the emission intensity of N þ 2 ðB 2 R þ u ! X 2 R þ g ; 0-0, 391.4 nm) is nearly constant along the needle to plate direction firstly, and rises sharply near the plate electrode. The vibrational temperature of N 2 (C) is almost independent of the pulsed peak voltage and the pulsed repetition rate, but rises with increasing the O 2 flow rate and keeps nearly constant in the lengthwise direction. The main physicochemical processes involved are discussed.

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Excessive Doppler broadening of the Hα line in a hollow cathode glow discharge

Cited by 28 publications

References 26 publications

Emission of fast non-Maxwellian hydrogen atoms in low-density laboratory plasma

Emission of fast non-Maxwellian hydrogen atoms in low-density laboratory plasma

Spectroscopic study of hydrogen rotational, vibrational and translational temperatures in a hollow cathode glow discharge

Experimental Research of OH and N 2 + Spatially Resolved Spectra in a Needle-Plate Pulsed Streamer Discharge

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