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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Wagenaars, Erik
University of York
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (4/4 displayed)
- 2020Influence of surface materials on the volume production of negative ions in a radio-frequency driven hydrogen plasmacitations
- 2019Analysis of plasma enhanced pulsed laser deposition of transition metal oxide thin films using medium energy ion scatteringcitations
- 2016Mechanisms behind surface modification of polypropylene film using an atmospheric-pressure plasma jetcitations
- 2011Heating of high energy density plasmas using EUV and x-ray laserscitations
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article
Influence of surface materials on the volume production of negative ions in a radio-frequency driven hydrogen plasma
Abstract
Negative atomic hydrogen ion (H-) densities were measured in a pulsed low-pressure E-mode inductively-coupled radio-frequency (rf) driven plasma in hydrogen by means of laser photodetachment and a Langmuir probe. This investigation focuses on the influence of different metallic surface materials on the volume production of H- ions. The H- density was measured above a thin disc of either tungsten, stainless steel, copper, aluminium, or molybdenum placed onto the lower grounded electrode of the plasma device as a function of gas pressure and applied rf power. For copper, aluminium, and molybdenum the H- density was found to be quite insensitive to pressure and rf power, with values ranging between 3.6x10^14 to 5.8x10^14 m^-3. For stainless steel and tungsten, the H- dependency was found to be complex, apart from the case of a similar linear increase from 2.9x10^14 to 1.1x10^15 m^-3 with rf power at a pressure of 25 Pa. Two-photon absorption laser induced fluorescence was used to measure the atomic hydrogen densities and phase resolved optical emission spectroscopy was used to investigate whether the plasma dynamics were surface<br/>dependent. An explanation for the observed differences between the two sets of investigated materials is given in terms of surface reaction mechanisms for the creation of vibrationally excited hydrogen molecules.