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25 Jun 2007

Volume 90, Issue 26, Articles (26xxxx)

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Appl. Phys. Lett. 90, 262501 (2007); http://dx.doi.org/10.1063/1.2752015 (3 pages)

Ian Appelbaum and Douwe J. Monsma
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Sterilization of bacterial endospores by an atmospheric-pressure argon plasma jet

Han S. Uhm, Jin P. Lim, and Shou Z. Li

Appl. Phys. Lett. 90, 261501 (2007); http://dx.doi.org/10.1063/1.2747177 (3 pages) | Cited 27 times

Online Publication Date: 27 June 2007

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Argon plasma jets penetrate deep into ambient air and create a path for oxygen radicals to sterilize microbes. A sterilization experiment with bacterial endospores indicates that an argon-oxygen plasma jet very effectively kills endospores of Bacillus atrophaeus (ATCC 9372), thereby demonstrating its capability to clean surfaces and its usefulness for reinstating contaminated equipment as free from toxic biological warfare agents. However, the spore-killing efficiency of the atmospheric-pressure argon-oxygen jet depends very sensitively on the oxygen concentration in the argon gas.
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52.77.-j Plasma applications
52.75.-d Plasma devices

Prepulse effect on laser-induced water-window radiation from a liquid nitrogen jet

J. Son, M. Cho, D. Kim, B. Ahn, and J. Kim

Appl. Phys. Lett. 90, 261502 (2007); http://dx.doi.org/10.1063/1.2751581 (3 pages) | Cited 2 times

Online Publication Date: 29 June 2007

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The authors show the prepulse effect on the conversion efficiency of a visible laser into water-window (λ = 2.3–4.4 nm) x ray from a liquid nitrogen jet. It is observed that a prepulse of only 2 mJ enhances the conversion efficiency by 10–15 times for the main pulse of 15–60 mJ at a delay of 3–6 ns. The photon flux is ∼ 1.2×1012 photons/pulse sr at a delay of 4 ns for a main pulse of 60 mJ with a prepulse of 4–8 mJ. It is noticed that the conversion efficiency increases with the delay up to 3 ns and is then saturated.
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52.38.Ph X-ray, γ-ray, and particle generation
52.25.Os Emission, absorption, and scattering of electromagnetic radiation
52.70.La X-ray and γ-ray measurements
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