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11 Apr 2005

Volume 86, Issue 15, Articles (15xxxx)

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Appl. Phys. Lett. 86, 152101 (2005); http://dx.doi.org/10.1063/1.1897831 (3 pages)

Walid Hafez and Milton Feng
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Production of atmospheric-pressure glow discharge in nitrogen using needle-array electrode

K. Takaki, M. Hosokawa, T. Sasaki, S. Mukaigawa, and T. Fujiwara

Appl. Phys. Lett. 86, 151501 (2005); http://dx.doi.org/10.1063/1.1905801 (3 pages) | Cited 20 times

Online Publication Date: 6 April 2005

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An atmospheric pressure glow discharge was generated using a needle-array electrode in nitrogen, and the voltage–current characteristics of the glow discharge were obtained in a range from 1 mA to 60 A. A pulsed high voltage with short rise time under 10 ns was employed to generate streamer discharges simultaneously at all needle tips. The large number of streamer discharges prevented the glow-to-arc transition caused by inhomogeneous thermalization. Semiconductor opening switch diodes were employed as an opening switch to shorten the rise time. The glow voltage was almost constant until the discharge current became 0.3 A, whereas the voltage increased with the current higher than 0.3 A. Electron density and temperature in a positive column of the glow discharge at 60 A were obtained to 1.4×1012 cm−3 and 1.3 eV from calculation based on nitrogen swarm data.
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52.80.Hc Glow; corona
52.50.-b Plasma production and heating
52.25.Fi Transport properties

Plasma-photocatalyst interaction: Production of oxygen atoms in a low pressure discharge

O. Guaitella, L. Gatilova, and A. Rousseau

Appl. Phys. Lett. 86, 151502 (2005); http://dx.doi.org/10.1063/1.1900314 (3 pages) | Cited 8 times

Online Publication Date: 6 April 2005

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A pulsed dc low pressure discharge in air (210 Pa) is used to study the mechanisms of activation of a photocatalytic material (TiO2) under plasma exposure. It is first shown that the presence of TiO2 inside the plasma region leads to a strong increase of the reduced electric field. Time resolved measurement of the atomic oxygen density is performed by actinometry during a 10 ms pulse at a low repetition rate (1 Hz) with and without TiO2 pellets inside the plasma region. The presence of TiO2 pellets strongly increases the O atom density during the first millisecond, but this effect saturates for longer exposure times.
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52.40.Hf Plasma-material interactions; boundary layer effects
82.50.Hp Processes caused by visible and UV light
82.33.Xj Plasma reactions (including flowing afterglow and electric discharges)
82.65.+r Surface and interface chemistry; heterogeneous catalysis at surfaces
78.47.-p Spectroscopy of solid state dynamics
52.80.-s Electric discharges

Peculiarities of electron emission from the cathode in an abnormal glow discharge

A. P. Bokhan, P. A. Bokhan, and D. E. Zakrevsky

Appl. Phys. Lett. 86, 151503 (2005); http://dx.doi.org/10.1063/1.1901819 (3 pages) | Cited 9 times

Online Publication Date: 6 April 2005

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Emissive properties of cold cathodes under the conditions of abnormal glow discharges are considered. Unlike the earlier made investigations, account is taken of alloying the surface layer by fast atoms generated in the cathode fall region. Atom implantation into the cathode to a depth of 10 nm changes the electron emission in a gas discharge radically as compared with vacuum conditions. Potential emission is reduced because of an increase in the surface work function. Kinetic emission is enhanced owing to an increase of the inelastic energy losses by fast atoms in the cathode material. Also greatly amplified is photoemission; moreover, its mechanism is changed.
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52.25.Tx Emission, absorption, and scattering of particles
52.80.Hc Glow; corona
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