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8 Jun 2009

Volume 94, Issue 23, Articles (23xxxx)

Issue Cover Spotlight Figure

Appl. Phys. Lett. 94, 233101 (2009); http://dx.doi.org/10.1063/1.3148782 (3 pages)

E. Moyen, M. Macé, G. Agnus, A. Fleurence, T. Maroutian, F. Houzé, A. Stupakiewicz, L. Masson, B. Bartenlian, W. Wulfhekel, P. Beauvillain, and M. Hanbücken
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Laser triggered single streamer in a pin-to-pin coplanar dielectric barrier discharge

P. F. Ambrico, M. Ambrico, M. Šimek, A. Colaianni, G. Dilecce, and S. De Benedictis

Appl. Phys. Lett. 94, 231501 (2009); http://dx.doi.org/10.1063/1.3152284 (3 pages) | Cited 1 time

Online Publication Date: 9 June 2009

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The effect of laser light interaction with alumina surface of a single filament coplanar dielectric barrier discharge has been investigated. It has been found that for laser photon energy lower than the pure alumina photoelectron emission threshold, the laser beam was effective in triggering single streamer discharge below regular ignition voltage threshold. This work demonstrates that triggering of the filamentary discharge occurs due to the laser induced extraction of electrons originally trapped by the plasma radiation at the dielectric surface; the trap energy levels lower than the dielectric band gap explain the easier electron detrapping due to incident laser photons.
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52.50.Jm Plasma production and heating by laser beams (laser-foil, laser-cluster, etc.)
52.38.Dx Laser light absorption in plasmas (collisional, parametric, etc.)
52.80.-s Electric discharges

High-energy negative ion beam obtained from pulsed inductively coupled plasma for charge-free etching process

O. V. Vozniy and G. Y. Yeom

Appl. Phys. Lett. 94, 231502 (2009); http://dx.doi.org/10.1063/1.3152763 (3 pages) | Cited 5 times

Online Publication Date: 9 June 2009

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Negative ions in conventional inductively coupled plasma are often more chemically active than positive ions (for example, in CF4 or SF6 plasmas), but inconveniently they are trapped inside the sheath and cannot be used for high-energy surface etching in sources with a grid-type acceleration system. In this work we describe a method of positive and negative ion extraction that allows the energy and flux of oppositely charged particles to be varied independently. Then by scattering the ions off from a metal surface, it is possible to form a high-energy beam of neutrals from the negative ions by using the low-energy positive component of the beam current for better charge compensation.
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52.50.Gj Plasma heating by particle beams
52.77.Bn Etching and cleaning
52.40.Kh Plasma sheaths
41.75.Cn Negative-ion beams

N2(A3Σu+) time evolution in N2 atmospheric pressure surface dielectric barrier discharge driven by ac voltage under modulated regime

P. F. Ambrico, M. Šimek, G. Dilecce, and S. De Benedictis

Appl. Phys. Lett. 94, 231503 (2009); http://dx.doi.org/10.1063/1.3152770 (3 pages) | Cited 2 times

Online Publication Date: 9 June 2009

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The relaxation of N2(A3Σu+) metastable in N2 ac (5 KHz and 7 KVpp) surface dielectric barrier discharge driven under pulse modulated regime, TON = 5 ms and TOFF = 20 ms, at atmospheric pressure has been investigated. N2(A) has been detected by optical-optical double resonance laser induced fluorescence in a space layer (space afterglow) at 1 mm above the discharge electrode. The time evolution clearly shows that in the space afterglow layer N2(A) builds up and decay in millisecond time scale and does not vary in the voltage cycle.
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52.80.Hc Glow; corona
76.70.Hb Optically detected magnetic resonance (ODMR)
78.55.-m Photoluminescence, properties and materials

Temporal behavior of cold atmospheric plasma jet

A. Shashurin, M. N. Shneider, A. Dogariu, R. B. Miles, and M. Keidar

Appl. Phys. Lett. 94, 231504 (2009); http://dx.doi.org/10.1063/1.3153143 (3 pages) | Cited 29 times

Online Publication Date: 11 June 2009

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Temporally resolved evolution of parameters in atmospheric plasma jet is studied by means of microwave scattering, fast photographing, and measuring of jet currents. It is observed that streamer (“plasma bullet”) propagating along with gas flow is generated immediately after the breakdown. It is demonstrated that an afterglow plasma column remains on the way of streamer passing. Lifetime of the afterglow plasma column is 3–5 μs, which is longer than that of the streamer.
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52.75.-d Plasma devices
52.80.Hc Glow; corona
52.70.Gw Radio-frequency and microwave measurements
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