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1 Nov 2004

Volume 85, Issue 18, pp. 3959-4247

Issue Cover Spotlight Figure

Appl. Phys. Lett. 85, 4142 (2004); http://dx.doi.org/10.1063/1.1811774 (3 pages)

Hong Jin Fan, Roland Scholz, Florian M. Kolb, and Margit Zacharias
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Reforming of ethanol in a microwave surface-wave plasma discharge

A. Yanguas-Gil, J. L. Hueso, J. Cotrino, A. Caballero, and A. R. González-Elipe

Appl. Phys. Lett. 85, 4004 (2004); http://dx.doi.org/10.1063/1.1808875 (3 pages) | Cited 18 times

Online Publication Date: 3 November 2004

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Hydrogen production through plasma reforming of ethanol at room temperature and moderate pressure has been carried out in a microwave surface-wave reactor. Both pure ethanol and mixtures ethanol-water have been studied. The reforming yield was almost 100% in all conditions with H2, solid carbon, CO and CO2 as the main reaction products. In the mixture ethanol-water the formation of solid C was avoided. The optical emission spectroscopy analysis has shown that the formation of the excited species CO*, CH* and C2* depends on the plasma mixture. The temperature of the OH* species was determined by analyzing the shape profile of its emission band.
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82.33.Xj Plasma reactions (including flowing afterglow and electric discharges)
52.77.-j Plasma applications
84.60.-h Direct energy conversion and storage

Efficient plasma source providing pronounced density peaks in the range of very low magnetic fields

G. Sato, W. Oohara, and R. Hatakeyama

Appl. Phys. Lett. 85, 4007 (2004); http://dx.doi.org/10.1063/1.1815071 (3 pages) | Cited 2 times

Online Publication Date: 3 November 2004

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Radio-frequency discharges are performed in low magnetic fields (0–10 mT) using three types of helicon-wave exciting antennas with the azimuthal mode number of ∣m∣=1. The most pronounced peak of plasma density is generated in the case of a phased helical antenna at only a few mT, where the helicon wave with m=+1 is purely excited and propagates. An analysis based on the dispersion relation well explains the density-peak phenomenon in terms of the correspondence between the antenna one-wavelength and the helicon wavelength, bringing forth the optimization principle of plasma source design in very low magnetic fields.
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52.50.Dg Plasma sources
52.25.-b Plasma properties
52.55.-s Magnetic confinement and equilibrium
52.40.Fd Plasma interactions with antennas; plasma-filled waveguides
52.80.Pi High-frequency and RF discharges
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