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28 Jul 2008

Volume 93, Issue 4, Articles (04xxxx)

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Appl. Phys. Lett. 93, 043101 (2008); http://dx.doi.org/10.1063/1.2963352 (3 pages)

Xin Fu, Jun Jiang, Wenzheng Zhang, and Jun Yuan
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Electron temperature and density determination in a nonequilibrium laser induced plasma by means of self-reversed-line spectroscopy

D. Karabourniotis, M. Ribiere, and B. G. Cheron

Appl. Phys. Lett. 93, 041501 (2008); http://dx.doi.org/10.1063/1.2963472 (3 pages) | Cited 6 times

Online Publication Date: 31 July 2008

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A method is presented for determining excited-level temperature (Tp), electron temperature (Tel) and density (nel) by comparing a self-reversed line emitted from high electron-density plasma with the computed Stark-broadened line shape. These parameters are simultaneously determined from the analysis of a resonance line of aluminum emitted at delay times of 109 ns in the early plasma arising from the laser ablation of aluminum. Substantial deviation from excitation equilibrium is evident from the large difference in Tp ( ≈ 8900 K) and Tel ( ≥ 13500 K).
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52.25.-b Plasma properties
52.50.Jm Plasma production and heating by laser beams (laser-foil, laser-cluster, etc.)
52.38.Mf Laser ablation

Modes in a pulse-modulated radio-frequency dielectric-barrier glow discharge

J. J. Shi, J. Zhang, G. Qiu, J. L. Walsh, and M. G. Kong

Appl. Phys. Lett. 93, 041502 (2008); http://dx.doi.org/10.1063/1.2965453 (3 pages) | Cited 15 times

Online Publication Date: 31 July 2008

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This letter reports an experimental study of a pulse-modulated radio-frequency dielectric-barrier discharge in atmospheric helium. By controlling the duty cycle at a modulation frequency of 10 and 100 kHz, the 13.56 MHz discharge is shown to operate in three different glow modes: the continuum mode, the discrete mode, and the transition mode. By investigating plasma ignition, residual electrons during power off are found to affect different glow modes. Duty cycle dependences of power density, gas temperature, optical emission intensities at 706 and 777 nm are used to capture clearly the characteristics of the three glow modes.
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52.80.Hc Glow; corona
52.80.Pi High-frequency and RF discharges
52.25.Os Emission, absorption, and scattering of electromagnetic radiation
52.50.-b Plasma production and heating

Hyperthermal hydrogen atoms in argon-hydrogen atmospheric pressure microplasma jet

C. Oliveira, J. A. Souza Corrêa, M. P. Gomes, B. N. Sismanoglu, and J. Amorim

Appl. Phys. Lett. 93, 041503 (2008); http://dx.doi.org/10.1063/1.2967016 (3 pages) | Cited 18 times

Online Publication Date: 31 July 2008

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An argon-hydrogen atmospheric pressure microplasma jet was constructed for the treatment of materials. The microplasma jet device operating at 50 W produced long plasma jet of 30 mm with gas temperatures measured, using OH emissions, from 1600 to 2600 K as a function of distance. Excitation temperature was found to be from 7000 to 10 000 K. Through the analysis of Hα line broadening mechanisms, surprising hot hydrogen atoms H (n = 3) were found with temperatures ranging from 12 000 to 19 600 K.
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52.75.-d Plasma devices
52.25.Kn Thermodynamics of plasmas

High-density magnetohydrodynamic energy conversion in a high-temperature inert gas

Tomoyuki Murakami and Yoshihiro Okuno

Appl. Phys. Lett. 93, 041504 (2008); http://dx.doi.org/10.1063/1.2966371 (3 pages) | Cited 4 times

Online Publication Date: 1 August 2008

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We describe high-density magnetohydrodynamic (MHD) energy conversion in a high-temperature seed-free argon plasma, for which a compact disk-shaped Hall-type radial-flow MHD electrical power generator is used. The state of the MHD power-generating plasma changes with increasing total inflow temperature from 8200 to 9400 K; unstable behavior accompanied by the appearance of fine structures is transformed to a homogeneous and stable state. The attained enthalpy extraction efficiency is comparable to previous results using a conventional seeded gas. Furthermore, a high power output density is achieved even in relatively low-density magnetic flux.
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52.30.Cv Magnetohydrodynamics (including electron magnetohydrodynamics)
52.25.Kn Thermodynamics of plasmas
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