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14 Jul 2008

Volume 93, Issue 2, Articles (02xxxx)

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Appl. Phys. Lett. 93, 023303 (2008); http://dx.doi.org/10.1063/1.2953179 (3 pages)

Takafumi Kawanishi, Takaaki Fujiwara, Megumi Akai-Kasaya, Akira Saito, Masakazu Aono, Junichi Takeya, and Yuji Kuwahara
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Absolute density and temperature of O(1D2) in highly Ar or Kr diluted O2 plasma

Keigo Takeda, Seigo Takashima, Masafumi Ito, and Masaru Hori

Appl. Phys. Lett. 93, 021501 (2008); http://dx.doi.org/10.1063/1.2957679 (3 pages) | Cited 4 times

Online Publication Date: 14 July 2008

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The absolute density and translational temperature of excited O atoms [O(1D2)] in O2 surface-wave-excited plasmas (SWPs) with high Kr or Ar dilution were measured by using vacuum ultraviolet laser absorption spectroscopy. It was observed that the absolute density of O(1D2) in Kr/O2 SWP was lower than that in Ar/O2 SWP above a pressure of 90 Pa, and the O(1D2) had an elevated temperature of around 2000 K in the SWPs. Furthermore, the O(1D2) flux was identified as a key parameter in the oxidation process. These results are very important knowledge relevant to plasma oxidation.
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52.25.Os Emission, absorption, and scattering of electromagnetic radiation
52.70.Kz Optical (ultraviolet, visible, infrared) measurements
52.38.Dx Laser light absorption in plasmas (collisional, parametric, etc.)

Ablation of liver cancer cells in vitro by a plasma needle

Xianhui Zhang, Maojin Li, Rouli Zhou, Kecheng Feng, and Size Yang

Appl. Phys. Lett. 93, 021502 (2008); http://dx.doi.org/10.1063/1.2959735 (3 pages) | Cited 33 times

Online Publication Date: 16 July 2008

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A plasma needle using a dielectric barrier discharge reactor at atmospheric pressure with a funnel-shaped nozzle was developed. The preliminary characteristics of the plume and applications to the ablation of cultured human hepatocellular carcinoma (HCC) BEL-7402 cell line were presented. The effect of oxygen, which was injected into argon plasma afterglow region through a steel tube, was studied. The efficiency of argon-oxygen plasma depends sensitively on the oxygen concentration in argon plasma. Large differences between spectra in atmosphere and those in Dulbecco’s modified eagle medium are found. It is found that ultraviolet rays, O, OH, and Ar radicals can reach the bottom of solution and act on HCC cells and there is an optimum input power to get the most radicals.
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87.53.Jw Therapeutic applications, including brachytherapy
87.19.xj Cancer
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