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27 Sep 2004

Volume 85, Issue 13, pp. 2451-2664

Issue Cover Spotlight Figure

Appl. Phys. Lett. 85, 2619 (2004); http://dx.doi.org/10.1063/1.1802384 (3 pages)

R. Basu, N. P. Guisinger, M. E. Greene, and M. C. Hersam
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Generation of atomic hydrogen during radio-frequency nitrogen plasma-assisted gas-source molecular-beam epitaxy of III-V dilute nitrides

A. Fotkatzikis, M.-A. Pinault, and A. Freundlich

Appl. Phys. Lett. 85, 2478 (2004); http://dx.doi.org/10.1063/1.1796537 (3 pages) | Cited 4 times

Online Publication Date: 28 September 2004

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The interaction of a typical gas-source molecular-beam epitaxy (GSMBE) environment with a radio-frequency (RF) nitrogen plasma source is investigated. In particular, a real-time in situ analysis of the evolution of the emission spectrum of an RF nitrogen plasma source, under high partial pressures of hydrogen (∼10−5 Torr), is presented. Hydrogen, emanating from the decomposition of hydride precursors in GSMBE, results in the appearance of a sharp emission peak at the region of 656 nm in the plasma spectrum, suggesting the generation of atomic hydrogen species in the nitrogen plasma cavity. The intensity of this peak is used for a qualitative evaluation of this interaction and its evolution as a function of the RF nitrogen plasma source conditions is investigated.
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81.05.Ea III-V semiconductors
68.55.A- Nucleation and growth
52.50.Dg Plasma sources
52.70.Kz Optical (ultraviolet, visible, infrared) measurements
81.15.Hi Molecular, atomic, ion, and chemical beam epitaxy
52.77.Dq Plasma-based ion implantation and deposition

On the potential distribution in Hall thrusters

Michael Keidar, Alec D. Gallimore, Yevgeny Raitses, and Iain D. Boyd

Appl. Phys. Lett. 85, 2481 (2004); http://dx.doi.org/10.1063/1.1797555 (3 pages) | Cited 14 times

Online Publication Date: 28 September 2004

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A model of the plasma flow in a Hall thruster channel is developed that takes into account the two-dimensional current conservation effect and relies on some experimental input parameters, such as magnetic field and electron temperature distribution. The model is an attempt to explain the experimentally found nonuniform potential distribution across the thruster channel. This effect is explained by the change of the electron mobility across a magnetic field due to the magnetic field gradient and due to the electron current along the magnetic field driven by the electron temperature gradient.
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52.30.Cv Magnetohydrodynamics (including electron magnetohydrodynamics)
52.65.Kj Magnetohydrodynamic and fluid equation
52.25.Fi Transport properties
52.75.Di Ion and plasma propulsion
52.25.Ya Neutrals in plasmas
52.55.Dy General theory and basic studies of plasma lifetime, particle and heat loss, energy balance, field structure, etc.
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