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4 Apr 2005

Volume 86, Issue 14, Articles (14xxxx)

Issue Cover Spotlight Figure

Appl. Phys. Lett. 86, 142101 (2005); http://dx.doi.org/10.1063/1.1895476 (3 pages)

M. Hanke, T. Boeck, A.-K. Gerlitzke, F. Syrowatka, F. Heyroth, and R. Köhler
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Electron imaging of charge-separated field on a copper film induced by femtosecond laser irradiation

Yasuaki Okano, Yoichiro Hironaka, Ken-ichi Kondo, and Kazutaka G. Nakamura

Appl. Phys. Lett. 86, 141501 (2005); http://dx.doi.org/10.1063/1.1897058 (3 pages) | Cited 7 times

Online Publication Date: 28 March 2005

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An instantaneous charge-separated field, built up at the femtosecond-laser-irradiated surface of a copper film, was observed by time-resolved electron imaging using an energy-chirped electron probe-beam. The probe beams with effective energies of 170 keV were generated by intense femtosecond laser irradiation onto a molybdenum target at an intensity of 1017 W/cm2. From the deflection of the probe electrons, the electric field was estimated to be 1.5 MV/m at a pump-laser intensity of 1015 W/cm2.
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61.80.Ba Ultraviolet, visible, and infrared radiation effects (including laser radiation)
61.82.Bg Metals and alloys

Microdischarges of xenon sustained by microwaves: Determination of scaling laws

A. Lacoste, O. Maulat, L. Latrasse, Y. Arnal, and J. Pelletier

Appl. Phys. Lett. 86, 141502 (2005); http://dx.doi.org/10.1063/1.1898426 (3 pages)

Online Publication Date: 29 March 2005

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The threshold conditions to maintain millimeter and submillimeter-size discharges of xenon with microwaves are experimentally determined. The threshold electric field required to sustain the plasma is reported as a function of gas pressure. The influence of the size of the dielectric cell in which the discharge is produced is also shown. The scaling laws are deduced from the threshold electric field measurements, assuming a few additional simplifying assumptions. The results are compared with data obtained with argon discharges sustained by surface waves in capillary tubes and the hypotheses assumed for the calculations are discussed.
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52.80.Pi High-frequency and RF discharges
52.25.Fi Transport properties
52.20.Fs Electron collisions

Temporal phenomena in inductively coupled chlorine and argon–chlorine discharges

C. S. Corr, P. G. Steen, and W. G. Graham

Appl. Phys. Lett. 86, 141503 (2005); http://dx.doi.org/10.1063/1.1897060 (3 pages) | Cited 13 times

Online Publication Date: 1 April 2005

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Reproducible modulations in low-pressure, inductively coupled discharges operating in chlorine and argon–chlorine mixtures have been observed and studied. Changes in the light output, floating potential, negative ion fraction, and charged particle densities were observed. Here we report two types of unstable operational modes in an inductively coupled discharge. On the one hand, when the discharge was matched, to minimize reflected power, instabilities were observed in argon–chlorine plasmas over limited operating conditions of input power and gas pressure. The instability window decreased with increasing chlorine content and was observed for chlorine concentrations between 30% and 60% only. However, when operating at pressures below 5 mTorr and the discharge circuit detuned to increase the reflected power, modulations were observed in a pure chlorine discharge. These modulations varied in nature from a series of sharp bursts to a very periodic behavior and can be controlled, by variation of the matching conditions, to produce an apparent pulsed plasma environment.
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52.35.Qz Microinstabilities (ion-acoustic, two-stream, loss-cone, beam-plasma, drift, ion- or electron-cyclotron, etc.)
52.25.-b Plasma properties
52.80.Hc Glow; corona
52.70.Kz Optical (ultraviolet, visible, infrared) measurements
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