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1 May 2012

Volume 111, Issue 9, Articles (09xxxx)

Issue Cover Spotlight Figure

J. Appl. Phys. 111, 093103 (2012); http://dx.doi.org/10.1063/1.4709385 (8 pages)

Ani Khachatrian, Joseph S. Melinger, and Syed B. Qadri
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Xenon doping of glow discharge polymer by ion implantation

Swanee J. Shin, Sergei O. Kucheyev, Christine A. Orme, Kelly P. Youngblood, Abbas Nikroo, Kari A. Moreno, Bryan Chen, and Alex V. Hamza

J. Appl. Phys. 111, 096101 (2012); http://dx.doi.org/10.1063/1.4707949 (3 pages)

Online Publication Date: 1 May 2012

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We demonstrate controlled doping of a glow discharge polymer by implantation with 500 keV Xe ions at room temperature. The Xe retention exhibits a threshold behavior, with a threshold dose of ∼2 × 1014 cm−2. Doping is accompanied by irradiation-induced changes in the polymer composition, including gradual H loss and a more complex non-monotonic behavior of the O concentration. The matrix composition saturates at C0.77H0.22O0.01 for Xe doses above ∼5 × 1014 cm−2 and up to the maximum dose studied (5 × 1015 cm−2). The retention mechanism is attributed to the modification of the polymer from a chain-like to clustered ring structure. The dopant profile and the elemental composition of the implanted polymer exhibit good stability upon thermal annealing up to 305 °C.
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81.05.Lg Polymers and plastics; rubber; synthetic and natural fibers; organometallic and organic materials
81.40.Gh Other heat and thermomechanical treatments
61.72.up Other materials
28.52.Fa Materials
52.70.Nc Particle measurements
61.41.+e Polymers, elastomers, and plastics

Screened field enhancement factor for a tall closely spaced array of identical conducting posts and implications for Fowler-Nordheim-type equations

Richard G. Forbes

J. Appl. Phys. 111, 096102 (2012); http://dx.doi.org/10.1063/1.4711091 (3 pages)

Online Publication Date: 2 May 2012

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For a floating-sphere model of an array of identical cylindrical posts, Zhbanov et al. [J. Appl. Phys. 110, 114311 (2011)] derive a limiting formula (as post height increases) for the screened field enhancement factor. An alternative derivation is given here for a simpler variant of this formula: more approximation is involved, but our derivation is more direct and explains the physical mechanism of collective screening in this limit more clearly. For a tall closely spaced array, the simplified formula also leads to simple expressions for the area efficiency of emission αM and for the macroscopic pre-exponential correction factor λM that needs to be included in “full” macroscopic Fowler-Nordheim-type equations that describe the average current density JM emitted from a large area field emitter.
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79.70.+q Field emission, ionization, evaporation, and desorption
85.45.Db Field emitters and arrays, cold electron emitters

Spectroscopic diagnostics of microhollow gas discharge in hydrogen

Dj. Spasojević, M. Cvejić, N. M. Šišović, and N. Konjević

J. Appl. Phys. 111, 096103 (2012); http://dx.doi.org/10.1063/1.4718570 (3 pages) | Cited 1 time

Online Publication Date: 15 May 2012

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Hydrogen Balmer beta line profile from a microhollow gas discharge (MHGD) in hydrogen is used for diagnostics of cathode sheath (CS) parameters. The profile was recorded from a MHGD microhole (diameter 100 μm at narrow and 130 μm at wider side) of a gold-alumina-gold sandwich in the pressure range (100–400) mbars. The average electric field strength in CS (25–46) kV/cm and CS thickness (60–120) μm were determined by profile fitting with the aid of model recently developed and used in argon MHGD.
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52.80.Hc Glow; corona
52.70.Kz Optical (ultraviolet, visible, infrared) measurements
52.40.Kh Plasma sheaths
52.25.Os Emission, absorption, and scattering of electromagnetic radiation
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