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29 Aug 2011

Volume 99, Issue 9, Articles (09xxxx)

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Appl. Phys. Lett. 99, 094101 (2011); http://dx.doi.org/10.1063/1.3629783 (3 pages)

Tomasz Szymborski, Piotr M. Korczyk, Robert Hołyst, and Piotr Garstecki
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Dynamics and particle fluxes in atmospheric-pressure electronegative radio frequency microplasmas

K. McKay, D. X. Liu, M. Z. Rong, F. Iza, and M. G. Kong

Appl. Phys. Lett. 99, 091501 (2011); http://dx.doi.org/10.1063/1.3631758 (3 pages) | Cited 4 times

Online Publication Date: 29 August 2011

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We report on intricate dynamics observed in atmospheric-pressure rf electronegative discharges where electrons and anions are separated due to their different mobilities. This results in the formation of positively charged regions between an electronegative plasma core and an oscillating electron ensemble. It is found that for a given input power, the electron, ion (both positive and negative) and neutral fluxes increase as the gap size is reduced, resulting in a more efficient delivery of chemical species to a treated target.
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52.30.-q Plasma dynamics and flow
52.50.Dg Plasma sources
52.80.Pi High-frequency and RF discharges
52.25.Fi Transport properties

Laser wakefield acceleration of electron beams beyond 1 GeV from an ablative capillary discharge waveguide

Haiyang Lu, Mingwei Liu, Wentao Wang, Cheng Wang, Jiansheng Liu, Aihua Deng, Jiancai Xu, Changquan Xia, Wentao Li, Hui Zhang, Xiaoming Lu, Cheng Wang, Jianzhou Wang, Xiaoyan Liang, Yuxin Leng, et al.

Appl. Phys. Lett. 99, 091502 (2011); http://dx.doi.org/10.1063/1.3626042 (3 pages) | Cited 6 times

Online Publication Date: 31 August 2011

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Laser wakefield acceleration of electrons well beyond 1 GeV and optical guiding of ultraintense laser pulses of peak powers up to 160 TW over a 4-cm long ablative capillary discharge plasma channel were experimentally demonstrated. Electron beams, with energies up to 1.8 GeV, were generated by using the 130 TW, 55 fs driving laser pulses. A comparison of oxygen-containing acrylic resin (C:O:H = 4:2:7) capillary and no oxygen-containing polyethylene (C:O:H = 1:0:2) capillary measurements suggests that the injection of electron into the laser wakefield is assisted by the ionization of oxygen K-shell electrons.
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52.77.-j Plasma applications
29.20.Ej Linear accelerators
41.75.Fr Electron and positron beams
41.75.Jv Laser-driven acceleration
52.38.Hb Self-focussing, channeling, and filamentation in plasmas

Photoluminescence of hydrogen amorphous carbon nitrile particles obtained in a 13.56 MHz dusty plasma

I. Géraud-Grenier, R. Jaffiol, V. Massereau-Guilbaud, and A. Plain

Appl. Phys. Lett. 99, 091503 (2011); http://dx.doi.org/10.1063/1.3632112 (3 pages) | Cited 2 times

Online Publication Date: 1 September 2011

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In this article, we report the photoluminescence (PL) of small particles generated in CH4/N2 radiofrequency (13.56 MHz) discharges. The particles have been produced with various mixtures of N2 and CH4 gases. The particle PL has been analysed using fluorescence microscopy in air with an Ar+ laser at 488 nm. It appears that the photoluminescence intensity is in relation to the particle size. However, the incorporation of nitrogen modifies the peak position of the PL spectrum.
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78.55.Qr Amorphous materials; glasses and other disordered solids
52.77.-j Plasma applications
78.55.Hx Other solid inorganic materials

Generation of laser-induced plasma in supercritical water and vibrational spectroscopic study of accompanying stimulated Raman scattering

Hiroharu Yui, Takaaki Tomai, Masayoshi Sawada, and Kazuo Terashima

Appl. Phys. Lett. 99, 091504 (2011); http://dx.doi.org/10.1063/1.3627161 (3 pages)

Online Publication Date: 2 September 2011

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We have formed a laser-induced plasma (LIP) in supercritical water (SCW) and studied associated molecular vibrations using spectroscopic methods. The accompanying forward and backward stimulated Raman scattering (SRS) of water molecules showed anisotropic behavior at supercritical conditions (>647 K and >22.1 MPa). The Raman shift of the backward SRS indicated that attractive interactions between water molecules and excess electrons generated by the LIP were dominant in the SCW. The backward SRS spectrum provided a microscopic view of the hydration environment around an excess electron, which is useful for controlling electron-driven chemical reactions and materials processing in SCW.
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52.50.Jm Plasma production and heating by laser beams (laser-foil, laser-cluster, etc.)
52.38.Bv Rayleigh scattering; stimulated Brillouin and Raman scattering
52.25.Os Emission, absorption, and scattering of electromagnetic radiation
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