Factbites
 Where results make sense
About us   |   Why use us?   |   Reviews   |   PR   |   Contact us  

Topic: Afterglow plasma


  
  » The Other (DVD) - Lcd versus plasma televisions
The young and dashing d`Artagnan and his compatriots--Athos, Porthos and Aramis--versus the master of intrigue, Cardinal Richelieu and the evil Lady de Winter.
This incomparable historical novel is unparalleled as the archetype of literary romance and adventure.
Delivering high resolution rates with a 12x total zoom power, the SVP CDC-7580 digital camera is the perfect camera for the first-time digital user.
www.lcdversusplasmatelevisions.com /The_Other_(DVD)/Content/10369874   (658 words)

  
  Encyclopedia :: encyclopedia : Plasma physics   (Site not responding. Last check: )
The ion temperature in a cold plasma is often near the ambient temperature.
The dynamics of plasmas interacting with external and self-generated magnetic fields are studied in the academic discipline of magnetohydrodynamics.
For many purposes the electric field in a plasma may be treated as zero, although when current flows the voltage drop, though small, is finite, and density gradients are usually associated with an electric field according to the Boltzmann relation.
www.hallencyclopedia.com /Plasma_physics   (2891 words)

  
 Gaseous cleaning method for silicon devices - Patent 4923828
Afterglow gas is defined herein as a gas which has been excited into a plasma state with an electrical potential and which is subsequently removed from the electrical potential source but which contains excited chemical species (free radicals) of sufficient lifetime to produce enhanced chemical reactivity downstream in the wafer cleaning chamber.
A plasma excitation electrode (16), connected to a source of electrical potential (17), is used to create a gaseous plasma in the generation chamber (15).
One advantage of using an afterglow gas as compared to a gaseous plasma is that species such as energeric ions and free electrons present in plasma are absent from the afterglow gas.
www.freepatentsonline.com /4923828.html   (2888 words)

  
 Schwarz, Steven Emanuel (1964-05-20) Plasma diagnosis means of photon-electron scattering. ...
Measurements conducted at various times in the development of an afterglow plasma indicate Doppler broadening of the scattered light; the broadening disappears as the electrons cool during the first three microseconds of the afterglow.
Measurements of electron density as a function of time are made in the afterglow, and are calibrated by means of Rayleigh scattering from gas at a known pressure.
The first is designated as "induced plasma luminosity" and the second as "giant scattering." Both effects appear to be related to the presence of hydrocarbon impurities in the gas.
etd.caltech.edu /etd/available/etd-10042002-124348   (261 words)

  
 Afterglow plasma in TutorGig Encyclopedia
In the afterglow of a plasma, also known as remote plasma, the external electromagnetic fields that sustained the plasma glow are absent or insufficient to maintain the discharge.
A plasma afterglow can either be a temporal, due to an interruped (pulsed) plasma source, or a spatial one, due to a distant plasma source.
Depending on the gas composition, superelastic collisions may continue to sustain the plasma in the afterglow for a while by releasing the energy stored in rovibronic degrees of freedom of the atoms and molecules of the plasma.
www.tutorgig.com /ed/Afterglow_plasma   (171 words)

  
 PowerPedia:Plasma - PESWiki
Plasma temperature is commonly measured in Kelvin or electron volts, and is (roughly speaking) a measure of the thermal kinetic energy per particle.
The dynamics of plasmas interacting with external and self-generated magnetic fields are studied in the academic discipline of magnetohydrodynamics.
A nonthermal plasma is in general any plasma which is not in thermodynamic equilibrium, either because the ion temperature is different from the electron temperature, or because the velocity distribution of one of the species does not follow a Maxwell-Boltzmann distribution.
peswiki.com /index.php/PowerPedia:Plasma   (4601 words)

  
 DavidPace.com - My Thesis Project   (Site not responding. Last check: )
The afterglow is considerably cooler than the main plasma and its density decreases in time as the atoms recombine.
The LAPD is a brilliant device for studying astrophysical plasmas because its length allows for the process of energy transport along the magnetic field lines to be examined.
Plasma properties generally move incredibly quickly parallel to magnetic field lines and are therefore difficult to study.
www.davidpace.com /Physics/graduate_school/thesis/1.html   (657 words)

  
 Abstract   (Site not responding. Last check: )
The boundary separating a plasma containing negative ions, and a plasma, without negative ions, is usually thin, so that the negative ion density falls rapidly to zero -- forming a negative ion density front.
During plasma ignition, negative ion fronts are the result of the break of smooth plasma density profiles during nonlinear convection.
In a steady-state plasma, the fronts are boundary layers with steepening of ion density profiles due to nonlinear convection also.
w3.pppl.gov /theory/bin/pubs/2001/PPPL-3529.html   (172 words)

  
 Milwaukee Plasma Tvs   (Site not responding. Last check: )
Afterglow plasma - In the afterglow of a plasma, also known as remote plasma, the external electromagnetic fields that sustained the plasma glow are absent or insufficient to maintain the discharge.
Plasma cosmology explains the large scale structure and evolution of the universe, from galaxy formation to the cosmic microwave background by invoking electromagnetic phenomena associated with laboratory plasmas.
Plasma stability - An important field of plasma physics is the stability of the plasma.
www.ultracoil.com /48/79.html   (1111 words)

  
 Plasma-assisted oxidation, anodization, and nitridation of silicon
Since silicon substrates were not in direct contact with the plasma in afterglow systems, only neutral or possibly excited-state oxygen atoms or oxygen molecules reached the surface of the growing oxide layer.
plasmas at temperatures between 400° and 700°C [17], although the oxidation rate was higher (21 nm in one hour at 700°C) than that reported in Reference [20].
plasmas [94] are consistent with very low current densities (no anodization or controlled area for current flow), and thus the trends are similar [except for (110) orientation] to those of thermal oxidation.
www.research.ibm.com /journal/rd/431/hess.html   (9910 words)

  
 Acta Physica Slovaca, volume 53, October 2003, no.5
The storage of matter and energy in confined plasma configurations is limited by an intermittent loss of particles and energy, usually referred to as anomalous transport.
The decay of the H3+ dominated afterglow plasma was monitored by means of infrared cavity ring-down spectrometer (CRDS) employing a cw-diode laser.
The high-temperature plasma was created by focusing a 1315 nm laser beam from the PALS iodine laser system (Institute of Physics, ASCR, Prague) on the surface of a metallic target placed in a vacuum interaction chamber.
www.acta.sav.sk /acta04/no3   (1169 words)

  
 Spartanburg SC | GoUpstate.com | Spartanburg Herald-Journal   (Site not responding. Last check: )
Flowing afterglow has many attractive aspects: well-understood laminar behavior, viscous gas flow, a large density of carrier gas which allows the study of thermalized reactions, and the capability to make new reactant ions in situ.
The ambipolar plasma is sampled using a nosecone and detected using conventional quadrupole or tandem mass spectrometry, depending on the application.
Flowing afterglow mass spectrometry, FA-MS, is a sensitive and quantitative mass spectrometry analytical approach that offers a route to on-line, real-time deuterium abundance measurements in water vapour in breath and above aqueous liquids, including urine and serum.
www.goupstate.com /apps/pbcs.dll/section?category=NEWS&template=wiki&text=Flowing_afterglow_mass_spectrometry   (624 words)

  
 Department of Physical Electronics
Plasma polymerization is used for the deposition of selective permeable thin films, protective coatings and humidity detectors.
Plasma diagnostic methods during the plasma-chemical reactions are used for understanding the kinetics of the plasma reactions.
The parameters of plasma as the temperature of neutral particles and the density of charged particles are evaluated from these profiles.
www.sci.muni.cz /~physics/departm.htm   (1025 words)

  
 Kotonline
Glow discharge: is the oldest type of plasma; it is produced at reduced pressure and assures the highest possible uniformity and flexibility of any plasma treatment.
A full width (2,4 m) vacuum plasma reactor which has been designed for the treatment of textiles is considerably more expensive than the commercial atmospheric reactors currently available, though with the latter type the fabric width is currently limited to 1,7 m.
When the processing gas - the gas which is partly ionised in the plasma - is air the related processing costs are as favourable for atmospheric reactors as for vacuum reactors.
www.kotonline.com /english_pages/ana_basliklar/kiekens.asp   (2745 words)

  
 FCT 2002   (Site not responding. Last check: )
The purpose of this project is to study the kinetics of various reactive species such as atoms and radicals and the role of ultraviolet (UV) photons in the afterglow of a flowing microwave discharge for sterilization purposes.
For this purpose a flowing microwave discharge is used for producing the active species and UV photons, with these species and photos being carried out downstream from the discharge to the post-discharge zone where they react with the objects to be sterilized at low temperatures.
However, most of these plasma systems have not been investigated systematically and very little is known about the destruction mechanisms of micro-organisms by plasma-activated species as well as about the best operating conditions for the plasma afterglow sterilizer.
cfp.ist.utl.pt /geg/Projects/fct2002.htm   (280 words)

  
 decaying plasmas
Kinetics of species in decaying plasmas is a research direction related to the development of new sources and diagnostic methods useful in plasma processing of materials (treatment, etching, and deposition).
A capacitively coupled, RF excited plasma jet has proven high efficiency for generation of excited species being a promising species source for remote plasma treatments.
By pulse relaxation plasmas we were able to increase by as much as 30 times the etching rates of aluminium layers (deposited by TVA method) in comparison with those obtained in dc plasmas.
alpha2.infim.ro /~ltpd/decay.htm   (626 words)

  
 APS - 2006 37th Meeting of the Division of Atomic, Molecular and Optical Physics - Event - On the rate of dissociative ...   (Site not responding. Last check: )
There is only one major persistant issue: Two recent experiments in flowing and stationary afterglow plasma with H$_3^+$ made by Glosik and collaborators demonstrated a significant dependence of the DR rate as a function of density of molecular hydrogen, which is present in the plasma.
In this study we are suggesting a model that explains the observed dependence of the DR rate on the density of H$_2$.
The model is based on the long-living metastable states of H$_3^*$ created in the decaying stationary or flowing plasma.
meetings.aps.org /Meeting/DAMOP06/Event/49165   (215 words)

  
 [No title]   (Site not responding. Last check: )
The boundary separating a plasma containing negative ions, and a plasma, without negative ions, is usually thin, so that the negative ion density falls rapidly to zero -- forming a negative ion density front.
During plasma ignition, negative ion fronts are the result of the break of smooth plasma density profiles during nonlinear convection.
In a steady-state plasma, the fronts are boundary layers with steepening of ion density profiles due to nonlinear convection also.
www.pppl.gov /pub_report/2001/PPPL-3529-abs.html   (180 words)

  
 [No title]
A stationary collision-radiative model for helium plasma is developed considering the following equations: (i) the transport equations for the electrons, (ii) the electron energy balance equation, (iii) the population rate equations for balance in the excited states and (iv) the electromagnetic field equations.
The EEDF is bi-Maxwellian in the reflex discharge plasma and is Maxwellian in the ECR plasma, and is independent of the gas used.
A plasma pressure wave is also recorded by a single tip Langmuir probe and the velocity (~103 m s-1) of the expanding plasma agrees well with the observed velocity of the magnetic wave.
www.ipplm.pl /bib/iopp/21.txt   (5076 words)

  
 [No title]
The recent analysis of DPF distributions in Heliotron E for different experimental conditions demonstrated the quite strong asymmetry even for the afterglow plasma: the total flows upward (θ=π/2) and downward (θ=3π/2) to symmetrically disposed collector arrays differed 5-7 times practically independently on direction of confining magnetic field.
Comparing differences of the DPF distributions for the plasma heating phase with that for the afterglow phase, the effects of the plasma heating was become clear.
The main reason of asymmetry change at the active stages of discharge, compare to that observed for the decaying plasma, is the presence of trapped particles, and the effects of locally trapped particles in a hot-electron (ECH) plasma or hot-ion (NBI) plasma reveal differently on the DPF distribution.
www.nifs.ac.jp /psi/abstract/o-24.html   (383 words)

  
 decaying plasmas
Kinetics of species in decaying plasmas is a research direction related to the development of new sources and diagnostic methods useful in plasma processing of materials (treatment, etching, and deposition).
Plasmas in both temporal and spatial relaxation have been investigated.
A new system, using relaxation oscillatory discharges, was investigated both electrically and optically in order to appreciate its ability in thin layers deposition and their subsequent etching.
alpha1.infim.ro /~ltpd/decay.htm   (626 words)

  
 APS - 2006 37th Meeting of the Division of Atomic, Molecular and Optical Physics - Event - Ar$^{+}$ recombination with ...   (Site not responding. Last check: )
APS - 2006 37th Meeting of the Division of Atomic, Molecular and Optical Physics - Event - Ar$^{+}$ recombination with negative ions in a flowing afterglow: A new approach.
A flowing electron-Ar$^{+}$ afterglow plasma is first established, and the ambipolar diffusion frequency is measured.
Then, an electron attaching gas is added to the afterglow, and the electron attachment rate constant and product ion branching fractions are measured in the usual manner.$^{2}$ Finally, the reactant gas concentration is reduced enough that the attachment reaction has not gone to completion by the end of the flow tube.
meetings.aps.org /Meeting/DAMOP06/Event/49164   (284 words)

  
 SPIE Proceedings Vol. 4747
The problem of determining the plasma parameters (electronic and ionic densities and currents, electric field strength) at the area, near to the cathode surface, is considered on the base of proposed approximations.
The plasma electrode consists of a ceramic pipe with a length of 290 mm.
The results of spectroscopic diagnostics of plasma decaying discharge on mixtures He(Ar, Kr, Xe)/H$-2$/O a in the range of spectra 130 - 1000 nm, and also results of optimization of radiation OH* depending on the kind of a buffer gas and current discharge are presented in the paper.
www.spie.org /web/abstracts/4700/4747.html   (8772 words)

  
 Afterglow - Qwika
Afterglow (song) Afterglow is the secong single from their new...
Afterglow plasma In the afterglow of a plasma, also known as remote...
continue to sustain the plasma in the afterglow for a while by releasing the...
www.qwika.com /find/Afterglow   (321 words)

  
 B.M. Smirnov, Cluster plasma - issue 5, 2000 - Uspekhi Fizicheskikh Nauk   (Site not responding. Last check: )
Properties of cluster plasma are considered, the term implying that clusters and small particles present in a plasma are involved in effective growth and evaporation processes.
The properties of an arc plasma, in particular cluster nucleation and radiation processes, are studied.
Methods for cluster beam generation are presented and a cluster generation technique using afterglow plasma is discussed.
www.ufn.ru /archive/abstracts/abst16.html   (137 words)

  
 Definition of Microwave plasma
Microwave-excited plasmas have two appealing properties: If applied in surface-wave-sustained mode, they are especially well suited to generate large-area plasmas of high plasma density.
This allows to spatially separate the location of plasma generation from the location of surface processing, see afterglow plasma.
Such a separation, together with an appropriate gas flow scheme, may help reduce the negative effect that particles released from a processed substrate may have on the plasma chemistry of the gas phase.
www.wordiq.com /definition/Microwave_plasma   (182 words)

  
 [No title]
GLOWCODE is a one-dimensional cylindrical code which simulates the decay of a hydrogen plasma in which the dominant loss mechanism is three body collisional-radiative recombination.
The afterglow is described by the variables ne, ni, na, Te, Ti, Ta which represent the electron density, the ion density, the atom density, electron temperature, ion temperature and atom temperature, respectively.
At each stage of the calculation pressure balance is re-established by adjusting the cylindrical shells, changing the plasma parameters adiabatically, until the pressure gradient is zero across the plasma radius.
www.cpc.cs.qub.ac.uk /summaries/ABUP_v1_0.html   (400 words)

  
 Nancy Giles   (Site not responding. Last check: )
Investigations of physics and chemistry of plasmas, plasma electronic devices, optics and spectroscopy, atomic and molecular physics, and lasers.
course Fys-410 (plasma fusion), University of Tromsø, 1998.
Diagnostics of plasmas with Langmuir probes (electron and ion energy distributions and densities, excited atom densities, electrostatic and acoustic oscillations, electron density and temperature fluctuations), optical spectroscopy (intensity and absorption of light, spectro-chemical analysis, interferometric, high resolution spectroscopy and lasers) and microwaves.
www.as.wvu.edu /coll03/phys/www/demidov.htm   (2870 words)

  
 Plasma Parameter Control of the Spatially Afterglow Plasma for the Gr owth of 3C-SiC Epitaxial Films by Triode Plasma ...   (Site not responding. Last check: )
To grow epitaxial SiC films at low temperature, plasma parameters in the afterglow plasma region of hydrogen gas were extensively controlled using rf triode plasma CVD.
The reduction of the rf plasma potential fluctuation was also investigated by the addition of bypass condensers between grid and grounded chamber.
The amplitude of the potential fluctuation in afterglow plasma region decreased from several tens volts to less than 2V at grid bias of -100V with the bypass condenser.
flux.aps.org /meetings/YR98/BAPSGEC98/abs/S1400007.html   (227 words)

Try your search on: Qwika (all wikis)

Factbites
  About us   |   Why use us?   |   Reviews   |   Press   |   Contact us  
Copyright © 2005-2007 www.factbites.com Usage implies agreement with terms.