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23 May 2005

Volume 86, Issue 21, Articles (21xxxx)

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Appl. Phys. Lett. 86, 213111 (2005); http://dx.doi.org/10.1063/1.1931027 (3 pages)

R. H. Miwa, W. Orellana, and A. Fazzio
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NO and NO2 production in pulsed low pressure dc discharge

Antoine Rousseau, Lina V. Gatilova, Jürgen Röpcke, Alexander V. Meshchanov, and Yury Z. Ionikh

Appl. Phys. Lett. 86, 211501 (2005); http://dx.doi.org/10.1063/1.1935046 (3 pages) | Cited 3 times

Online Publication Date: 16 May 2005

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Simultaneous measurements of both NO and NO2 are performed downstream a pulsed low pressure dc discharge in flowing air using tunable diode laser absorption spectroscopy in the infrared region. Pulse duration and repetition rate range from 20 μs to 5 ms and from 50 to 1000 Hz, respectively. The gas pressure is 4 mbar and the peak current is 80 mA. Experimental results show that NO and NO2 production depends only on the duty cycle ratio, that is, on the average power at a given current. A numerical computation of a simplified kinetics agrees well with experiment results.
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52.77.-j Plasma applications
52.80.-s Electric discharges
52.70.Kz Optical (ultraviolet, visible, infrared) measurements
82.33.Xj Plasma reactions (including flowing afterglow and electric discharges)
82.20.Wt Computational modeling; simulation
52.25.-b Plasma properties

Effects of oxygen radicals in low-pressure surface-wave plasma on sterilization

Masaaki Nagatsu, Fumie Terashita, Hiroyuki Nonaka, Lei Xu, Toshi Nagata, and Yukio Koide

Appl. Phys. Lett. 86, 211502 (2005); http://dx.doi.org/10.1063/1.1931050 (3 pages) | Cited 40 times

Online Publication Date: 18 May 2005

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The effects of oxygen radicals on sterilization were studied using a 2.45 GHz surface-wave oxygen plasma. A population of 1.5×106 Bacillus stearothermophilus spores was irradiated for 3 min or more with oxygen plasma, generated at pressures between 6 and 14 Pa. The decimal reduction value (D value), a measure of the effectiveness of sterilization, was determined to be about 15–25 s. Using only oxygen radicals, excluding all charged particles, the 1.5×106 spores were sterilized with a D value of 30–45 s after 5 min or more of irradiation. On scanning electron microscopy, the length and width of the spores changed significantly due to chemical etching by oxygen radicals.
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87.80.-y Biophysical techniques (research methods)
87.64.Ee Electron microscopy
52.77.Bn Etching and cleaning

Cathodic arcs: Fractal voltage and cohesive energy rule

André Anders, Efim M. Oks, and Georgy Yu. Yushkov

Appl. Phys. Lett. 86, 211503 (2005); http://dx.doi.org/10.1063/1.1937994 (3 pages) | Cited 11 times

Online Publication Date: 19 May 2005

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The noise of the burning voltage of cathodic arcs in vacuum was analyzed for a range of cathode materials (C, Mg, Ti, V, Ni, Cu, Zr, Nb, Ag, Hf, Ta, W, Pt, Bi, and Si). Cathodic arcs were generated in a coaxial plasma source, and the voltage noise was measured with a broadband measuring system. Each measurement was analyzed by fast Fourier transform, revealing a power spectrum ∼ 1/f2 for all cathode materials over several orders of magnitude of frequency f (brown noise). The absence of any characteristic time down to possible cutoffs at high frequencies supports a fractal model of cathode spots. The amplitude of colored noise scaled approximately linearly with the cathode’s cohesive energy, which is another manifestation of the cohesive energy rule.
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52.80.Mg Arcs; sparks; lightning; atmospheric electricity
52.80.Vp Discharge in vacuum
52.50.Dg Plasma sources
52.25.Gj Fluctuation and chaos phenomena
05.45.Df Fractals
05.40.Ca Noise
02.60.-x Numerical approximation and analysis

Nonideal effects on electron-atom bremsstrahlung in partially ionized hydrogen plasmas

Young-Dae Jung

Appl. Phys. Lett. 86, 211504 (2005); http://dx.doi.org/10.1063/1.1939074 (3 pages) | Cited 2 times

Online Publication Date: 19 May 2005

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The nonideal collective and plasma screening effects on nonrelativistic electron-atom bremsstrahlung process are investigated in partially ionized hydrogen plasmas. The effective pseudopotential model taking into account the screening and collective effects is applied to describe the interaction potential in nonideal plasmas. The electron-atom bremsstrahlung radiation cross section is obtained as a function of the nonideality plasma parameter, Debye length, projectile energy, and radiation photon energy. The results show that the collective and screening effects reduce the electron-atom bremsstrahlung radiation cross section in nonideal plasmas, especially, for the soft radiation region. It is also found that the atomic correlation effect suppresses the bremsstrahlung radiation cross section and is decreased with the increase in the nonideality plasma parameter.
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52.40.Mj Particle beam interactions in plasmas
52.25.Os Emission, absorption, and scattering of electromagnetic radiation
52.20.-j Elementary processes in plasmas
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