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30 Apr 2001

Volume 78, Issue 18, pp. 2617-2804

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Voltage–current characteristics of high-current glow discharges

K. Takaki, D. Taguchi, and T. Fujiwara

Appl. Phys. Lett. 78, 2646 (2001); http://dx.doi.org/10.1063/1.1369612 (3 pages) | Cited 14 times

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The voltage–current characteristics of glow discharges in gas mixture (N2:O2 = 8:2) at a pressure of 10 Torr were obtained with the discharge current up to 150 A. Parallel-plane electrodes with a diameter of 10.7 cm and a discharge chamber with co-axial geometry were used to produce glow discharge with high current. The glow discharge voltage was almost constant until the whole surface of the cathode was covered with glow, i.e., until the discharge current became 3.7 A in our experimental condition (a normal glow discharge mode). The voltage, however, increased with the current when the glow covered over the cathode (an abnormal glow discharge mode). The electron density in positive column of the high-current glow discharge was obtained to be 3×1011 cm−3 from Langmuir probe measurements. © 2001 American Institute of Physics.
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52.80.Hc Glow; corona
52.25.-b Plasma properties
52.70.Ds Electric and magnetic measurements

Radio-frequency plasma jet generator of singlet delta oxygen with high yield

Josef Schmiedberger and Hiroo Fujii

Appl. Phys. Lett. 78, 2649 (2001); http://dx.doi.org/10.1063/1.1367899 (3 pages) | Cited 26 times

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O2(a 1Δg) was generated in a flowing discharge of a radio-frequency (rf) hollow electrode. The radio frequency was 99.9 MHz and the rf power was 200 W. The discharge was done in the gas mixture O2:N2:NO = 200:20:10 sccm and then it was chilled reactively by the mixture Ar:NO2=200:10 sccm. The O2(a 1Δg) relative yield of 32% was achieved at the pressure of 0.43 Torr. Usage of the mixtures O2:NO = 200:100 sccm and Ar:NO2 = 100:100 sccm resulted in the O2(a 1Δg) yield of 25% at the pressure of 0.6–0.9 Torr. The effluent was mixed with molecular iodine in a far afterglow region and it was tested in an oxygen–iodine laser. The iodine flow rate was 0.3 mmol/min. A strong enhancement of atomic iodine spontaneous emission at the wavelength of 1315 nm was observed in the optical resonator. © 2001 American Institute of Physics.
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52.75.-d Plasma devices
42.55.Lt Gas lasers including excimer and metal-vapor lasers
52.80.Pi High-frequency and RF discharges
52.30.-q Plasma dynamics and flow
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