Spectroscopic study of high energy excited deuterium atoms in a hollow cathode glow discharge

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

doi:10.1063/1.2721077

Cited by 9 publications

(12 citation statements)

References 53 publications

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“…Several experiments including the recent ones showed that the profiles observed perpendicular to the discharge axis ͑side-on͒ as symmetric [1][2][3][8][9][10][11][12][13][14] where as the profiles obtained at the end of the discharge axis ͑end-on͒ as asymmetric with enhanced blue wings. [1][2][3][4][5][6][7] Whether, end-on or side-on, in both the cases, the EB was detected.…”

Section: Introductionmentioning

confidence: 95%

“…[1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18] Study of these discharges has many important applications in the field of plasma surface interactions, low temperature electrical discharges used for plasma processing, and fusion plasmas. Despite of many detailed studies reported on these discharges, complete understanding on various fundamental processes governing in plasma-wall transition ͑sheath͒ region is still lacking.…”

Section: Introductionmentioning

confidence: 99%

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Signature of fast H atoms from cathode glow region of a dc discharge

et al. 2009

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Asymmetric broadening of H ␣ line from cathode glow region has been studied. In the cathode glow, mean energy and fractional population of very fast hydrogen atoms were found to be ϳ130 eV and ϳ55%, respectively. These values reduced to ϳ90 eV and ϳ20% when measured at negative glow region. The observed asymmetry was attributed to the presence of the fast hydrogen atoms near the cathode surface. The mean energy and number density of excited fast hydrogen atoms were estimated from the velocity distribution of H + , H 2 + , and H 3 + considering collisions inside the cathode sheath. The reduction in the mean energy and number density of the excited fast hydrogen atoms, at the other locations of the discharge, was explained by energy relaxation and thermalization of the neutrals with the background gas.

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Section: Introductionmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

Signature of fast H atoms from cathode glow region of a dc discharge

et al. 2009

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“…[33] and references therein. The same types of reactions ( 1)-( 3) are expected in deuterium and, consequently, similar interactions with cathode surface occur [1].…”

Section: Introductionmentioning

confidence: 55%

“…There is considerable interest in the shape of Balmer lines emitted from a low-pressure discharge operating with hydrogen isotopes and with hydrogen-inert gas mixtures, see e.g. [1]. The interest is triggered primarily by large excessive Doppler broadening (EDB) of hydrogen Balmer lines detected first time from hydrogen and hydrogen-inert gas mixtures in a hollow cathode (HC) glow discharge (GD) [2].…”

Section: Introductionmentioning

confidence: 99%

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Doppler spectroscopy of hydrogen Balmer lines in a hollow cathode water vapour and argon–water vapour glow discharge

Jovović¹,

Šišović²,

Konjević³

2008

J. Phys. D: Appl. Phys.

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The results of Doppler spectroscopy of hydrogen Balmer lines in a stainless steel (SS) and copper (Cu) hollow cathode (HC) water vapour and argon–water vapour glow discharge are reported. The experimental profiles in water vapour discharge are fitted well by superposing three Gaussian profiles. The half widths of narrow and medium Gaussian are, in energy units, 0.2–0.5 and 3–4 eV for SS HC and 0.14–0.38 and 2.7–3.7 eV for Cu HC which is expected on the basis of earlier electron beam → H2O vapour experiments. The half width of the largest Gaussian in water vapour is 22 eV and 13 eV for SS and Cu HC, respectively. In argon–water vapour discharge three Gaussians are also required to fit experimental profiles. While half widths of narrow and medium Gaussians are similar to those in water vapour, the half width of the largest Gaussian is 37 eV and 28 eV for SS and Cu HC, respectively. The half widths of the largest Gaussian in water vapour and in argon–water vapour mixture indicate the presence of excessive Doppler broadening. The differences in width of the excessively broadened part of the line profiles with SS and Cu HC in water vapour and in argon–water vapour mixture are explained as a consequence of oxide formation at the cathode surface. This study is an attempt to extend and compare our earlier investigations of anomalous Doppler broadening in HC discharge operated with hydrogen isotopes or hydrogen mixtures with inert gases to hydrogen containing inorganic molecules.

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Predicted Properties of Cylindrical Microhollow Cathode Discharges in Helium Using a Two‐Dimensional, Self‐Consistent Fluid Model

Meng

Yan

et al. 2009

Contrib. Plasma Phys.

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In this paper, a numerical simulation model was developed to simulate the helium plasma in a cylindrical Microhollow cathode based on a two-dimensional, time-dependent and self-consistent fluid model. The aim of our work is to provide estimates of the main discharge and plasma parameters and to help understand the basic mechanisms governing the MHCD devices. Accurate solutions of the continuity equations, electron energy balance equation and possion's equation with realistic boundary conditions are obtained. Realistic discharge characteristics are simulated, which are very important to understand the phenomena of microhollow cathode discharge (MHCD). The results show that there exists a hollow cathode effect in the discharge process. He electric field is mainly a radial field close to the cathode in the discharge area. The influences of gas pressure and cathode dimension on discharge characteristics were also investigated.

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Spectroscopic study of high energy excited deuterium atoms in a hollow cathode glow discharge

Cited by 9 publications

References 53 publications

Signature of fast H atoms from cathode glow region of a dc discharge

Signature of fast H atoms from cathode glow region of a dc discharge

Doppler spectroscopy of hydrogen Balmer lines in a hollow cathode water vapour and argon–water vapour glow discharge

Predicted Properties of Cylindrical Microhollow Cathode Discharges in Helium Using a Two‐Dimensional, Self‐Consistent Fluid Model

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