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14 Feb 2005

Volume 86, Issue 7, Articles (07xxxx)

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Appl. Phys. Lett. 86, 071101 (2005); http://dx.doi.org/10.1063/1.1862756 (3 pages)

Robert Horvath, Henrik C. Pedersen, Nina Skivesen, David Selmeczi, and Niels B. Larsen
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Predicted properties of microhollow cathode discharges in xenon

J. P. Boeuf, L. C. Pitchford, and K. H. Schoenbach

Appl. Phys. Lett. 86, 071501 (2005); http://dx.doi.org/10.1063/1.1862781 (3 pages) | Cited 57 times

Online Publication Date: 7 February 2005

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A fluid model has been developed and used to help clarify the physical mechanisms occurring in microhollow cathode discharges (MHCD). Calculated current-voltage (I-V) characteristics and gas temperatures in xenon at 100 Torr are presented. Consistent with previous experimental results in similar conditions, we find a voltage maximum in the I-V characteristic. We show that this structure reflects a transition between a low-current, abnormal discharge localized inside the cylindrical hollow cathode to a higher-current, normal glow discharge sustained by electron emission from the outer surface of the cathode. This transition, due to the geometry of the device, is a factor contributing to the well-known stability of MHCDs.
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52.80.Hc Glow; corona
52.25.Fi Transport properties
52.25.Tx Emission, absorption, and scattering of particles
52.25.Jm Ionization of plasmas
52.65.-y Plasma simulation

Interaction of a laser-produced plume with a second time delayed femtosecond pulse

D. Scuderi, O. Albert, D. Moreau, P. P. Pronko, and J. Etchepare

Appl. Phys. Lett. 86, 071502 (2005); http://dx.doi.org/10.1063/1.1864242 (3 pages) | Cited 32 times

Online Publication Date: 11 February 2005

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Time resolved emission spectroscopy coupled with a secondary time-delayed femtosecond pulse technique has been used to study laser–matter interaction that occurs within ablation processes from a solid target, in the 1012–1014 W/cm2 energy range. It allows an examination of the emitted optical signals that characterize the species escaping from the target, namely ions, neutrals, and nanoparticles. Size distributions of nanoparticles are deduced from an analysis of the deposition substrate. The newest result concerns the huge drop of emission signal from the nanoparticles, which occurs at a delay (0.8<Δt<1 ns) and has been attributed to a fragmentation process.
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78.47.-p Spectroscopy of solid state dynamics
61.80.Ba Ultraviolet, visible, and infrared radiation effects (including laser radiation)
42.62.-b Laser applications
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