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29 Nov 2010

Volume 97, Issue 22, Articles (22xxxx)

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Appl. Phys. Lett. 97, 223101 (2010); http://dx.doi.org/10.1063/1.3519844 (3 pages)

Jin-Kyu Yang, Svetlana V. Boriskina, Heeso Noh, Michael J. Rooks, Glenn S. Solomon, Luca Dal Negro, and Hui Cao
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Ion acceleration and cooling in gasless self-sputtering

David Horwat and André Anders

Appl. Phys. Lett. 97, 221501 (2010); http://dx.doi.org/10.1063/1.3521264 (3 pages) | Cited 4 times

Online Publication Date: 2 December 2010

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Copper plasma with hyperthermal directed velocity (8.8 eV) but very low temperature (0.6 eV) has been obtained using self-sputtering far above the runaway threshold. Ion energy distribution functions (IEDFs) were simultaneously measured at 34 locations. The IEDFs show the tail of the Thompson distribution near the magnetron target. They transform to shifted Maxwellians with the ions being accelerated and cooled. We deduce the existence of a highly asymmetric, pressure-driven potential hump which acts as a controlling “watershed” between the ion return flux and the expanding plasma.
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52.77.Dq Plasma-based ion implantation and deposition
52.70.-m Plasma diagnostic techniques and instrumentation
79.20.Rf Atomic, molecular, and ion beam impact and interactions with surfaces

Sharp rise of excitation temperature in the periphery of lamp arcs measured from the 254 nm resonance line of mercury

E. Drakakis and D. Karabourniotis

Appl. Phys. Lett. 97, 221502 (2010); http://dx.doi.org/10.1063/1.3524212 (3 pages) | Cited 1 time

Online Publication Date: 3 December 2010

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Unexpected sharp rise of the excitation temperature of the resonance state of mercury measured in the arc boundary of a high intensity discharge lamp verifies the existence of an enhanced radiation source in the outer arc layer from which radiation excess observed in the valley of self-reversed lines is originated. This temperature was deduced from line-of-sight measurements of the radiance at the red peak of the 254 nm resonance line of mercury. The nonradiative transfer of excitation energy by resonant collisions between mercury atoms in the dense plasma medium is a very plausible explanation of the radiation source enhancement.
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42.72.Bj Visible and ultraviolet sources
52.80.Mg Arcs; sparks; lightning; atmospheric electricity
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