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	Electron - MSN Encarta
		Electrons, neutrons, and protons are elementary particles—that is, they are among the smallest parts of matter that scientists can isolate.
		Electrons are responsible for many important physical phenomena, such as electricity and light, and for physical and chemical properties of matter.
		The electron is affected by three of the four fundamental forces that define the nature and interaction of everything in the universe: gravitation, the electromagnetic force, and the weak nuclear force.
	encarta.msn.com /encyclopedia_761558264/Electron.html (764 words)

	Electron configuration - Wikipedia, the free encyclopedia
		Electrons are able to jump from one energy level (as orbital filling laws allow) to another by emission of a quantum of energy, in the form of a photon.(For creation of photons in the visible light range, see Balmer series) The properties of electron configuration in atoms form the basis for covalent bonding.
		Electron configuration is intimately related to the structure of the periodic table.
		The chemical properties of an atom are largely determined by the arrangement of the electrons in its outermost ("valence") shell (although other factors, such as atomic radius, atomic mass, and increased accessibility of additional electronic states also contribute to the chemistry of the elements as atomic size increases).
	en.wikipedia.org /wiki/Electron_configuration (1432 words)

	4 Propagation of an electron cloud (Site not responding. Last check: 2007-11-03)
		Therefore, it is important to consider the dynamics of the electron beams at distances greatly exceeding the size of the electron cloud.
		The electrons in the structure propagate as a continuous stream, being slightly perturbed by the density fluctuations.
		The electron distribution function of beam electrons remains smooth as in the previous case with sine-like density oscillations.
	aanda.u-strasbg.fr:2002 /papers/aa/full/2001/32/aa1121/node4.html (1989 words)

	Electron \| World of Chemistry
		Electrons are found in the area outside the nucleus of an atom.
		The electron cloud is not a definite shape or size, rather it is simply the space where electrons are likely to be located.
		Electrons with higher energies are in higher energy levels, increasing in distance from the nucleus as energy increases.
	www.bookrags.com /research/electron-woc (1835 words)

	Grand Unified Theory: Wave Theory and the Electron
		Because the electron cloud belongs to the magnetic path (picture below and to the right), it moves in a perpendicular path from north to south or south to north, or around the energetic swirl (proton) - but only in the direction of the swirl’s rotation, west to east.
		The electron is not a static object rotating around a proton (energetic swirl), but a living formation, constantly changing position and energy levels.
		The electron cloud comes in contact with the positron cloud in front of the magnetic swirl of a neighbouring atom, creating a large, high-energy positron-electron wave-like formation.
	www.grandunifiedtheory.org.il /book/electronP.htm (1476 words)

	Electron cloud - Wikipedia, the free encyclopedia
		Electron cloud is a term used for introducing the concept of wavefunction in low-level pedagogical introductions to atomic physics, molecular physics, chemistry or quantum chemistry.
		This representation is related to the idea that the electrons are not precisely located around the atomic or molecular nuclei but must instead be described by probability amplitudes or wavefunctions which provides the probability to find electrons in a given region of space (for example along a particular chemical bond).
		These mathematical functions of the coordinates of all electrons are often expressed in terms of electronic configurations or Slater determinants which are in turn expressed in terms of atomic or molecular orbitals.
	en.wikipedia.org /wiki/Electron_cloud (259 words)

	ATOM - GoGoSearch.com (Site not responding. Last check: 2007-11-03)
		Electrons are bound to the nucleus by photons carrying the electromagnetic force.
		Under some circumstances an electron may be excited to a higher energy level (that is, it absorbs energy from an external source and leaps to a higher shell), leaving a space in a lower shell.
		Decays involving electrons or positrons are due to the weak nuclear interaction.In addition, like the electrons of the atom, the nucleons of nuclei may be pushed into excited states of higher energy.
	www.gogosearch.com /wiki/atom (3637 words)

	Accelerator Development: Special Systems - ILC @ SLAC
		In the beam pipe of the positron damping ring, an electron cloud may be produced by ionization of residual gas or photoelectrons and develop by the secondary emission process.
		If electron cloud mitigation techniques are not found that are sufficient for the baseline positron ring (two 6 km rings), then a 17 km ring is a possible alternative.
		Ohmi, Electron cloud in the Linear Colliders in the Proceedings of the ECLOUD04 workshop, Aprile 2004.
	www-project.slac.stanford.edu /ilc/testfac/ecloud/elec_cloud.html (1160 words)

	Electron Cloud in the LHC
		Since October 2000, apparent electron cloud effects are observed with the LHC beam in the PS to SPS transfer line and also on the last turns prior to ejection from the PS.
		Electron Cloud Buildup and Instability: Numerical Simulations for the CERN Proton Synchrotron, PRST-AB 6:010101 (2003).
		Interplay of Ionization and Sputtering with the Electron Cloud, CERN-SL-2001-014-AP.
	ab-abp-rlc.web.cern.ch /ab-abp-rlc-ecloud (2310 words)

	ELECTRON CONFIGURATIONS
		The knowledge which scientists have gained about the location of electrons is based on the fact that electrons are normally found in an area around the nucleus of the atom that is called an electron cloud.
		The electron may be stimulated to move away from the nucleus to higher energy states by adding energy to the atom in the form of heat or a measurable amount of electricity, etc. When this is done, the electron momentarily reaches an excited state.
		Since we are dealing with light in learning about electrons, it is helpful for the student to approach the study with an understanding of the nature and characteristics of light before actually proceeding into the study of electron locations.
	www.wise.k12.va.us /jjk/Chemistry/ELECTRON.html (1170 words)

	X-rays: Electron Shells
		As a simple model, an atom may be considered to be a positively charged nucleus surrounded by shells of negatively charged electrons.
		More accurately, an atom consists of a nucleus surrounded by electrons that occupy volumes of space (orbitals) around it (Figure 2.5.3.2) only some of which are spherical.
		Actual probability distributions for electron clouds, which are considered as shells in this discussion.
	www4.nau.edu /microanalysis/Microprobe/Xray-ElectronShells.html (235 words)

	JCE 1997 (74) 771 [Jul] Teaching Chemistry with Electron Density Models
		Students find electron density models easy to understand and use, and because these models are easily applied to a broad range of topics, they successfully convey to students the importance of electronic structure.
		Another way to construct an electron density model of lithium is to choose a particular value of the electron density and show all points in space where the density has the chosen value.
		The electronic structure of a delocalized molecule such as benzene or carbonate ion presents a unique problem for chemistry students because it cannot be described using a single Lewis structure.
	jchemed.chem.wisc.edu /Journal/Issues/1997/Jul/abs771.html (4368 words)

	ROCO Electron density: definition
		According to this point of view, the electron density is a number that tells us how much charge is located at each point in the cloud.
		A wave function assigns a number to each point in space, and the numbers oscillate so that they are positive at some locations and negative at others (this behavior may remind you of the way a water wave can make a lake's surface rise at some points and fall at others).
		We say the cloud is "stationary" because the amount of negative charge at each point does not change (remember: the orbital's shape does not change).
	academic.reed.edu /chemistry/roco/Density/cloud.html (816 words)

	CERN Courier - CERN workshop studies electr - IOP Publishing - article
		Clouds of electrons triggered by synchrotron radiation or by seed electrons created by ionization of residual gas are likely to set performance limits on high-intensity particle storage rings like the forthcoming Large Hadron Collider.
		These electrons are accelerated by the charge of a passing bunch of positively charged particles and can go on to free further low-energy electrons from the opposite wall of the chamber.
		The pressure increase caused by the electron cloud, its impact on beam diagnostics and, for the LHC, the heat load on the beam screen and cold bore are further primary concerns.
	www.cerncourier.com /main/article/42/6/15 (767 words)

	Electron Cloud (Site not responding. Last check: 2007-11-03)
		In the layers that follow outward is where we find electrons moving about in what has come to be called as a "cloud." It is not a cloud like those you see in the sky.
		It is known that it is not possible to determine the position of electrons in atoms and molecules.
		Hence the term "electron cloud." Vince Calder ============================================================== Allison, A "cloud" of something means a lot of them close together but not constantly touching each other, usually in the air.
	www.newton.dep.anl.gov /askasci/chem00/chem00876.htm (374 words)

	Electron Configuration
		The electron configuration of an atom is the particular distribution of electrons among available shells.
		The number of electrons in an atom of an element is given by the atomic number of that element.
		The size of the electron cloud increases as the principal quantum number increases.
	library.thinkquest.org /10429/high/eleconfig/electron.htm (812 words)

	Formation and diffusion of the electron cloud
		If the interaction occured in the depleted layer, the electrons are pulled by the electric field and the cloud drifts into CCD potential wells, while spreading wider due to diffusion processes at the same time.
		If the cloud was formed in the undepleted bulk of silicon, the electrons diffues without a drifting component, where only the electrons that reach the border with the depleted region are carried by the electric field into the potential wells of the CCD.
		The final cloud size is an important parameter which determines how the charge of the cloud is split between adjacent pixels.
	www.astro.psu.edu /xray/docs/cal_report/node166.html (530 words)

	ROCO Electron density: connectivity
		Covalent bonds are associated with a build-up of electron density between the bonded atoms.
		Electron density builds up more (≥ 0.3) where there are multiple bonds, and to a lesser degree (≥ 0.1) where there are only single bonds.
		Taken together, these surfaces show that the electron density cloud is roughly the same in each CO bonding region, and all of the CO bonds are equivalent.
	academic.reed.edu /chemistry/ROCO/Density/bondpaths.html (810 words)

	Electron-Cloud Simulations: An Update - Zimmermann (ResearchIndex)
		In particular, we discuss modifications to the secondary emission model, electron cloud build up simulated for various filling patterns, central cloud density, electron `pinch' during the bunch passage, expected tune shifts and tune spreads, memory between LHC bunch trains, heat loads in LHC arcs and straight sections, consequences of varying bunch spacing, suppression of...
		2 Electron Cloud and Beam Scrubbing in the LHC (context) - Bruning - 1999
		1 Observation of the Electron Cloud on Pick-Up Signals in the..
	citeseer.ist.psu.edu /595007.html (685 words)

	Physical Science \| Session 8
		When subatomic particles, including the electron, were discovered, they were assumed to be tiny spheres — in fact, they were assumed to be so tiny that they didn’t have a diameter at all.
		It is the shape of the particle, i.e., the shape of its electron cloud, which determines the strength of the force between particles.
		The uneven charge distribution, i.e., the shape of the electron cloud, also results in a strong force between water molecules, which explains why water is a liquid at room temperature and has a relatively high boiling point.
	www.learner.org /channel/courses/essential/physicalsci/session8/closer1.html (626 words)

	Re: How do alpha particles make it past the electron cloud?
		For an electron to become part of an atom with an alpha particle, the relative energy should not be more than about 100 electron volts, or 0.0001 MeV.
		For an electron to change the alpha particle in a nuclear fashion, alot of energy is needed.
		To summarize, there is too much interaction energy for the electrons to stick electronically (as part of an atom), and not nearly enough energy for the electrons to change the nuclear structure of the alpha particle.
	www.madsci.org /posts/archives/feb99/919968484.Ph.r.html (598 words)

	Atomic Physics
		This cloud shall be a consequence of quantum physics, which rules the region of the atom and the small.
		And the electron cloud of such an s-wave electron shall be spherical in shape.
		Because the energy needed to raise an electron from a low state to a high state is the same as the energy released when an electron tumbles from the high state to the low state.
	www.jupiterscientific.org /science/baeparts/atomicphysics.html (1402 words)

	Quantum - Electron Cloud
		But before they could view it's electrons they had to grind it, buff it and polish it till it was just 100 nanometers thick - about 1/1000 the thickness of a sheet of paper.
		After that we have lenses but for electron beams instead of using glass lenses we use magnets so there's a series of magnets here which focus the electron beam down onto the sample.
		Because the electrons move too fast too be frozen in time, what you see is their blurred path, or orbitals, around the atoms.
	www.abc.net.au /quantum/stories/s116324.htm (895 words)

	Electron Cloud Theory (Site not responding. Last check: 2007-11-03)
		Electrons travel at rapid speeds approaching the speed of light, namely ______ mi/sec.
		Electrons move in a pattern a certain distance from the nucleus called an ____.
		If the electron moves from this orbit to another orbit there is an area the electron will cross but can not stay in called the ____ (2 words).
	murraystate.edu /qacd/cit/agr/Agr576/ElectriciyFundamentals/tsld004.htm (55 words)

	Electron Cloud Theory (Site not responding. Last check: 2007-11-03)
		The value of "n" is the primary quantum number that determines the energy of the electron.
		In addition quantum mechanics requires that no two electrons can have the same set of quantum numbers and there is required a third quantum number, "s" the spin quantum number and it can have only two values s=+1/2 and s= -1/2.
		Application of these rules allows one to construct the electron configuration of all the elements in the periodic table [for the most part, there are some exceptions however].
	www.newton.dep.anl.gov /askasci/chem00/chem00187.htm (316 words)

	Proceedings ECLOUD'02 Workshop, CERN, 15-18 April 2002 (Site not responding. Last check: 2007-11-03)
		Electron cloud build-up and related instability in the CERN PS
		A Simulation Study of the Electron Cloud in the Experimental Regions of LHC
		On the Transparency of the Electron Cloud to Synchrotron
	wwwslap.cern.ch /collective/ecloud02/proceedings/index.html (432 words)

	ChemViz Electron Density vs Charge Lab (Site not responding. Last check: 2007-11-03)
		The relative size of the atom's electron cloud varies with the charge on the atom and the probability of finding an electron in a particular position in an atom.
		The size of the electron cloud depends on the number of protons and electrons in an atom.
		The size of the electron cloud also changes as different electron shells (energy levels) become filled or emptied as an atom gains or loses electrons.
	chemviz.ncsa.uiuc.edu /content/lab-s-densvschrg.html (460 words)

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