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Topic: Conduction electron

	Fermi level and Fermi function
		Electrons are fermions and by the Pauli exclusion principle cannot exist in identical energy states.
		In the case of the semiconductor, the density of states is of the same form, but the density of states for conduction electrons begins at the top of the gap.
		The population of conduction electrons for a semiconductor is given by
	hyperphysics.phy-astr.gsu.edu /hbase/solids/fermi.html (934 words)

	Surface-Conduction Electron-Emitter Displays
		The key to the electron emitters, at the heart of the SED, is an extremely narrow slit several nanometers wide between two electric poles.
		Electrons are emitted from one side of the slit when approximately 10V of electricity are applied.
		Some of these electrons are scattered at the other side of the slit and accelerated by the voltage (approximately 10 kV) applied between the glass substrates; causing light to be emitted when they collide with the phosphor-coated glass plate (Fig.
	www.clarycon.com /surface-conducti.html (335 words)

	Impurities. Crystal doping
		In this case, the impurity is 1 electron short of the required amount of electrons needed to establish covalent bonds with 4 neighboring atoms.
		Notice, the indium atom in the figure is 1 electron short of the required amount of electrons needed to form covalent bonds with 4 neighboring atoms and, therefore, creates a hole in the structure.
		Electrons in the valence band find it relatively easy to hop into these new levels, opening up a population of holes in the valence band.
	www.mtmi.vu.lt /pfk/funkc_dariniai/sol_st_phys/impurities.htm (1219 words)

	Method of manufacturing image-forming apparatus - Patent 6221426
		Conventionally, an electron emitting region 5 is produced in a surface conduction electron-emitting device by subjecting the electroconductive film 4 of the device to a current conduction treatment which is referred to as "energization forming".
		When observed through a transmission electron microscope and by means of Raman spectroscopy, it was found that the devices of the substrate A and B had a carbon deposit principally made of graphite of the same crystallity as the graphite for Example 1.
		Therefore, an electron source comprising a plurality of such electron-emitting devices and an image-forming apparatus incorporating such an electron source are produced through an activation process that is controllable much easier than its counterpart of any known methods to minimize the deviation in the performance of the electron source and that of the image-forming apparatus.
	www.freepatentsonline.com /6221426.html (13627 words)

	A new theory ON THE NATURE OF LIGHT AND the introduction of 'AUMIC " WAVES.
		The conduction electron population for a metal is calculated by multiplying the density of conduction electron states r(E) times the Fermi function f(E).
		The example of copper wire conduction shows that the mean free path of electrons in a copper wire at room temperature is in the neighborhood of 40 nm.
		The energy which we have suggested of 1.24 eV is sufficient to be absorbed by an electron in the peripheral orbit of the copper atom and to shift it from its orbit.
	www.geocities.com /natureoflight/photonpropagation.html (580 words)

	Conduction Electron Population for Semiconductor (Site not responding. Last check: 2007-10-22)
		The conduction electron population for a semiconductor is calculated by multiplying the density of conduction electron states
		The number of conduction electrons as a function of energy is then given by
		I.e., the tail of the function which extends into the conduction band is so far out that it can be approximated by the Boltzmann function.
	hyperphysics.phy-astr.gsu.edu /hbase/solids/fermi3.html (146 words)

	[No title]
		Quantum mechanically, however, the electron is not a hard little point, but a fuzzy ball of probability; consequently, the classical calculation must break down when the distance x between the electron and the metal surface is so small that the wavefunctions of the conduction electrons begin to overlap with that of the outside electron.
		Conduction electrons in a metal behave almost as free electrons, so the potential U(x) which the electrons see may be approximated as a simple square well of finite depth.
		Electrons near the fermi level in the left metal are now at the same energy as unoccupied states in the right metal, and they can tunnel through the potential barrier between the metals, if the barrier thickness x is sufficiently small.
	www.colorado.edu /physics/TZD/SolidStateChs/NewCh14solidsIIthurs.doc (14702 words)

	PHOTOS
		A simplified QM (quantum mechanical) theory of conduction in a crystal lattice is known as the Kronig-Penney model, and the periodic potential experienced by an electron travelling through a crystal is approximated by a regular series of rectangular potential wells.
		Solving the Schrodinger equation for the conduction electrons gives the result that there is a continuous band of possible conduction electron energy, and the electrons are free to move without obstruction through the crystal.
		It is the regularity of the lattice which permits conduction, and the irregularity at a given location which interacts with conduction electrons to cause scattering.
	www.angelfire.com /ab3/mjramp/golopid/wire.html (2878 words)

	Solar Energy Conversion by Dye-Sensitized Photovoltaic Cells
		It is clear from Figure 4 that the movement of electrons in the conduction band of the mesoscopic films must be accompanied by the diffusion of charge-compensating cations in the electrolyte layer close to the nanoparticle surface.
		The formation of the oxidized sensitizer and conduction band electrons due to heterogeneous charge transfer from the excited ruthenium complex into the conduction band of the oxide is resolved on a femtosecond time scale.
		The electron is subsequently injected in the semiconductor oxide support, while the hole is transferred to a hole conductor or an electrolyte present in the pores of the nanocrystalline oxide film.
	pubs.acs.org /cgi-bin/sample.cgi/inocaj/2005/44/i20/html/ic0508371.html (6302 words)

	SED Technology Surface-conduction Electron-emitter Display Technology Surface-conduction Electron-emitter Display SED ...
		The key to the electron emitters at the heart of the SED is an extremely narrow slit (several nanometers* wide) made from ultrafine-particle film between the two electric poles.
		Electrons are emitted from one side of the slit when 16 to 18 volts of electricity are applied.
		Some of these electrons are scattered at the other side of the slit and accelerated by the voltage (approximately 10kV) applied between the glass plates, and they collide with the fluorescent-coated glass plate, causing light to be emitted.
	www.soundscapeav.com /sed/SEDtech.htm (552 words)

	[No title]
		Since the electrons are highly degenerate, there are few lower energy states for an electron to move to when losing energy.
		In a white dwarf energy is carried by electron conduction rather than radiation which is very efficient and explains the isothermal core.
		The high efficiency of this electron conduction is such that the interior is nearly isothermal; the temperature only drops significantly in non-degenerate layers.
	www4.hmc.edu:8001 /Physics/quizzes/Astro62/1998/astr12.txt (1718 words)

	Joule Dissipation / Ionosphere of Venus - Section 3
		This cooling rate often exceeds that due to electron heat conduction, and may in fact be the means for balancing the Joule dissipation at the lowest altitudes.
		Taking the heat conduction curve in Figure 3b as a guide, it is clear that the temperature gradient scale must be very short to supply sufficient heating, and as shown in the appendix, large topside temperatures may be required to provide the downward heat flux necessary to balance the vibrational cooling at the bottomside.
		Electron motion is almost certainly dominated by collisions, and it is unlikely that electrons can remain in resonance with waves.
	www-ssc.igpp.ucla.edu /~strange/Joule_paper/Joule_3.html (1794 words)

	Elec. Spin Polariza. Determin. from Lumines. Polari. (Site not responding. Last check: 2007-10-22)
		Potential sources of confusion in relating the sign of electron spin polarization in the semiconductor to the electron spin polarization in the ferromagnet include i) differences in nomenclature convention between the magnetic metals and semiconductor communities; and ii) imprecise specification of experimental quantities in a consistent reference frame.
		Since the electron spin and magnetic moment are antiparallel in magnetic metals, the terms "majority spin" and "spin up", which are synonymous for a ferromagnet, refer to an electron with moment parallel to the magnetization and spin antiparallel to the magnetization.
		The angular momenta of the light, and of the electrons in the ferromagnet and semiconductor are shown in Fig.
	physics.nist.gov /Divisions/Div841/Gp3/Projects/MagNano/esp.html (1281 words)

	Carrier generation and recombination - Wikipedia, the free encyclopedia
		The electron–hole pair is the fundamental unit of generation and recombination, corresponding to an electron transitioning between the valence band the conduction band.
		The actual energy distribution among the electrons is described by the Fermi energy and the temperature of the electrons.
		Carrier generation describes processes by which electrons gain energy and move from the valence band to the conduction band, producing two mobile carriers; while recombination describes processes by which a conduction band electron loses energy and re-occupies the energy state of an electron hole in the valence band.
	en.wikipedia.org /wiki/Electron-hole_pair (749 words)

	Joule Dissipation / Ionosphere of Venus
		The low electron and O density curves are representative of the high-altitude ionosphere and ionopause, while the high electron density represents the low-altitude ionosphere.
		For the purposes of calculating the electron cooling due to collisions we assume that the ion temperature is equal to the neutral gas temperature in (5).
		Electron heat conduction carries away any excess heat that cannot be absorbed by the neutral atmosphere.
	www-ssc.igpp.ucla.edu /~strange/Joule_paper/Joule.html (9915 words)

	Speed of electricity flow (speed of current.) (Site not responding. Last check: 2007-10-22)
		The actual number of electrons which contribute to the electrical current is not equal to the number of electrons in the conduction band.
		The electrons which contribute to electrical conduction are those electrons within the Fermi Surface which are "uncompensated." From symmetry, these electrons lie on, or near the surface, and result as the Fermi Surface is "shifted" by the electric field.
		The fraction of electrons that remain uncompensated is approximately given by the ratio (drift velocity)/(Fermi velocity).
	amasci.com /miscon/speed.html (2142 words)

	Electron Speedometer
		The electric current in a material is not the same as the electron velocity but more like the number of cars that pass a specific highway exit per hour.
		The electrons' radio wave frequencies will vary with their positions just as the field does.
		When the team performed the same experiment with a current flowing, many electrons were on the move, exploring a whole range of magnetic field strengths and precession speeds as they moved through the sample.
	focus.aps.org /story/v17/st4 (704 words)

	[No title]
		Because there are so many more electrons per unit volume in Sirius B the degeneracy at the same temperature is much higher.
		An electron can travel long distances without colliding with a nucleus since the orbitals next every nucleus are all occupied.
		Electron conduction is much faster and more efficient, resulting in a nearly constant temperature throughout the interior of the star.
	www4.hmc.edu:8001 /Physics/quizzes/Astro62/1997/astr13.txt (1665 words)

	Electron-emitting device, electron source, and image-forming apparatus - Patent 6908356
		This invention relates to an electron source and an image-forming apparatus such as a display apparatus incorporating an electron source and, more particularly, it relates to a novel surface conduction electron-emitting device as well as a novel electron source and an image-forming apparatus such as a display apparatus incorporating such an electron source.
		8, the substrate 81 of the electron source may be a glass substrate and the number and configuration of the surface conduction electron-emitting devices arranged on the substrate may be appropriately determined depending on the application of the electron source.
		The surface conduction electron-emitting devices may be arranged directly on the substrate 81 or on the interlayer insulation layer (not shown).
	www.freepatentsonline.com /6908356.html (15198 words)

	solids12.nb
		A free electron gas is a gas of electrons subject to the Pauli exclusion principle (fermions).
		In the free electron model, valence electrons become conduction electrons, able to move about the metal in response to an electric field.
		• The velocity of electrons at the Fermi surface are
	www.ireap.umd.edu /~nmoody/ENEE600/HTMLLinks/ENEE600_6.html (450 words)

	Canon and Toshiba To Develop Next-Generation Flat-Screen Surface-Conduction Electron-Emitter Displays
		Electron emitters, which correspond to an electron gun in a CRT television, are distributed in an amount equal to the number of pixels on the display.
		The SED consists of a glass plate mounted with electron emitters and with pixels similar in number to those of a CRT electron gun.
		Some of these electrons are accelerated by the voltage applied between the glass plates and collide with the fluorescent-coated glass plate, causing light to be emitted.
	www.physorg.com /news1295.html (639 words)

	[No title]
		The electron is no longer in a single potential well, but is now in the left half of a double well, and in the vicinity of the barrier the wavefunction now appears as shown in Fig.
		Because of the applied negative voltage, the electron energy levels in the metal are raised and the electron energy outside the metal slopes away, reflecting the existence an electric field surrounding the metal.
		The electron beam in a television tube is generated by thermionic emission from a heated tungsten filament.
	www.colorado.edu /physics/TZD/NewChapters/Fin14text.doc (4095 words)

	[No title] (Site not responding. Last check: 2007-10-22)
		The primary mystery of heavy fermion materials is the cause of the large conduction electron masses or correspondingly the cause of the slow fermi velocity of the conduciton electrons.
		It is generally agreed that the interaction of the conduction electrons with the itinerate f-electrons of the Ce ion leads to the dramatic increase in cyclotron effection.
		The effective mass of the conduction electrons in CeB6 is enhanced by electron interactions with other objects in the lattice.
	www.phys.lsu.edu /students/dhall/wwwThesis/ceb6_mass_problem.html (1725 words)

	surface-conduction electron-emitter display - a Whatis.com definition
		The SED consists of an array of electron emitters and a layer of phosphor, separated by a small space from which all the air has been evacuated.
		Each electron emitter represents one pixel (picture element).
		Prototype electron emitters have been developed with diameters of a few nanometers (billionths of a meter).
	whatis.techtarget.com /gDefinition/0,294236,sid1_gci797765,00.html (238 words)

	IGN: CES 2006: Toshiba's Plasma/LCD Killer (Site not responding. Last check: 2007-10-22)
		The electronics maker showcased prototype SED sets at CES and every IGN editor on-hand was in agreement: nothing else compares.
		SED sets use 6,220,800 electron emitters - or one for each color per pixel, to be precise - which cause red, blue and green phosphors to glow.
		Unfortunately, the electronics maker was hush-hush on pricing for SEDs and would not even venture to give us a ballpark figure for these televisions.
	gear.ign.com /articles/679/679235p1.html (746 words)

	Toshiba challenges plasma and LCD with SED panel - CNET.com
		Supposedly, the result is tube-level picture quality in a flat form factor.
		Find out her plan of attack against the huge electronics show.
		The consumer electronics industry needs another new TV technology like it needs...
	www.cnet.com /4520-10602_1-5618734-1.html (586 words)

	SED-TV (Surface-conduction Electron-emitter Display)
		Both companies strive to win over the customer, by any means necessary, whether it is a lower price, more extras, or just anything that takes that extra step to make us happy.
		One of the glasses is covered with electron emitters, while the other is covered with phosphorus.
		Each electron emitter is matched up with a pixel on the monitor, allowing extreme precision in images!
	www.sed-tv.com (864 words)

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