Bernstein polynomial - Revision history

Deltahedron: /* References */ expand bibliodata

2014-06-30T18:40:06Z

References: expand bibliodata

← Older revision		Revision as of 20:40, 30 June 2014
Line 1:		Line 1:
	~~'''Electron ionization''' ('''EI''', formerly known as '''electron impact''')~~ is ~~an [[ionization]] method in which energetic [[electron]]s interact~~ with gas phase atoms or molecules to produce [[ion]]s.<ref>{{GoldBookRef\|title=electron ionization\|file=E01999}}</ref> This technique is widely used in [[mass spectrometry]], particularly for gases and volatile [[organic chemistry\|organic molecules]].		Roberto is the name Our love to be called with though I won't really like being known like that. My pals say it's not superb for me but possibilities I love doing can be to bake but I'm just thinking on starting interesting things. South Carolina is where some of my home is. Software developing is how My spouse and [http://www.answers.com/topic/i+support i support] my family. You can acquire my website here: http://prometeu.net<br><br>Also visit my blog post: hack clash of clans ([http://prometeu.net relevant internet site])

	~~==Principle of operation==~~

	~~[[Image:Schematic diagram of an EI ion source.jpg\|thumb\|right\|300 px\|Diagram representing an electron ionization ion source]]~~

	~~The following [[Phase (matter)\|gas phase]] reaction describes the electron ionization process:<ref>R. Davis, M. Frearson, (1987). ''Mass Spectrometry – Analytical Chemistry by Open Learning~~'~~', John Wiley & Sons, London.</ref>~~

	~~:<math>M + e^- \to M^{+\bullet} + 2e^-,</math>~~

	~~where M is the analyte molecule~~ being ~~ionized, e<sup>−</sup> is the electron and M<sup>+•</sup> is the resulting [[ion]]~~.

	~~In an EI [[ion source]], electrons are produced through [[thermionic emission]] by heating a wire filament that has [[electric current]] running through~~ it~~. The electrons are accelerated to 70 eV in the region between the filament and the entrance~~ to the ion source block. The accelerated electrons are then concentrated into a beam by being attracted to the trap electrode. The sample under investigation which contains the neutral molecules is introduced to the ion source in a perpendicular direction to the electron beam. Close passage of highly energetic electrons, referred to as a ''hard'' ionization source, causes large fluctuations in the electric field around the neutral molecules and induces ionization and fragmentation.<ref>K. Robinson ''et al.'' Undergraduate Instrumental Analysis, 6th ed. Marcel Drekker, New York, 2005.</ref> The [[radical ion\|radical cation]] products are then directed towards the mass analyzer by a repeller electrode. The ionization process often follows predictable cleavage reactions that give rise to fragment ions which, following detection and signal processing, convey structural information about the analyte.

	~~The [[ionization efficiency]] and production of fragment ions depends strongly~~ on ~~the chemistry of the analyte and the energy of the electrons~~. At low energies (around 20 [[Electronvolt\|eV]]), the interactions between the electrons and the analyte molecules do not transfer enough energy to cause ionization. At around 70 eV, the [[Matter wave\|de Broglie wavelength]] of ~~the electrons matches the length of typical bonds in organic molecules (about 0~~.~~14 [[Nanometre\|nm]]) and energy transfer to organic analyte molecules~~ is ~~maximized, leading to the strongest possible ionization~~ and fragmentation. Under these conditions, about 1 in 1000 analyte molecules in the source are ionized. At higher energies, the de Broglie wavelength of the electrons becomes smaller than the bond lengths in typical analytes; the molecules then become "transparent" to the electrons and ionization efficiency decreases.

	~~==Notes==~~
	~~{{Reflist}}~~

	~~==References==~~
	~~{{refbegin}}~~
	*{{cite book \| author = Edmond de Hoffman \| coauthors = Vincent Stroobant \| title = Mass Spectrometry: Principles and Applications \| edition = 2nd ed. \| publisher = John Wiley and Sons \| year = 2001 \| isbn = 0-471-48566-7}}
	*{{cite book \|author=Stephen J. Schrader \|title=Interpretation of Electron Ionization Data: The Odd Book \|publisher=Not Avail \|location= \|year=2001 \|pages= \|isbn=0-9660813-6-6 \|oclc= \|doi= \|accessdate=}}
	*{{cite book \|author=Peterkops, Raimonds \|title=Theory of ionization of atoms by electron impact \|publisher=Colorado Associated University Press \|location=Boulder, Colo \|year=1977 \|pages= \|isbn=0-87081-105-3 \|oclc= \|doi= \|accessdate=}}
	*{{cite book \|author= \|title=Electron impact ionization \|publisher=Springer-Verlag \|location=Berlin \|year=1985 \|pages= \|isbn=0-387-81778-6 \|oclc= \|doi= \|accessdate=}}
	~~{{refend}}~~

	~~==External links==~~
	* [http://~~webbook~~.~~nist~~.~~gov~~/~~cgi~~/~~cbook~~.~~cgi?ID=C108883&Units=SI&Mask=200#Mass-Spec NIST Chemistry WebBook]~~
	* [http://~~www2~~.~~chemistry.msu.edu~~/~~faculty~~/~~reusch/VirtTxtJml/Spectrpy/MassSpec/masspec1~~.~~htm Mass Spectrometry]. Michigan State University.~~

	~~{{Mass spectrometry}}~~

	~~{{DEFAULTSORT:Electron Ionization}}~~
	~~[[Category:Ion source]]~~
	~~[[Category:Mass spectrometry]]~~
	~~[[Category:Scientific techniques]~~]

212.149.219.192: Consistently as a function of x again, and as b not B

2014-01-05T13:57:10Z

Consistently as a function of x again, and as b not B

← Older revision		Revision as of 15:57, 5 January 2014
Line 1:		Line 1:
	~~For your offense~~, ~~you might experience Gunboats~~ which ~~can basically shoot at enemy rights coming from a long range and Landing Projects which you must seal when you train gadgets~~ for ~~example Rifleman, Heavy, Zooka, Warrior~~ and ~~Containers~~. ~~To your village defenses~~, ~~you might have structures like Mortar~~, ~~Machine Gun~~, ~~Sniper Tower, Cannon, Flamethrower, Mine~~, ~~Tank Mine, Boom Cannon and Catapult Launcher to assist you eradicate enemies~~.<br><br>~~Video games are fun~~ to use your kids. Aid you learn much more your kid's interests. Sharing interests with children like this can will also create great conversations. It also gives an opportunity to monitor developing on their skills.<br><br>~~Avoid purchasing big title adventure near their launch date. Waiting means that you're prone to have clash of clans cheats after having a patch or two also has emerge to mend evident holes~~ and ~~bugs may perhaps impact your pleasure coupled with game play. Along with keep an eye out for titles from galleries which are understood fresh air and good patching and support.~~<br><br>~~Battle of Clans~~ is ~~fully~~ a ~~popular sport~~ in ~~order~~ to ~~end up~~ being ~~brandished on multiple systems, paperwork iOS and also android~~. The ~~overall game~~ is ~~terribly intriguing but presently over there comes~~ a ~~spot each morning legend, where~~ the ~~individual gets trapped because because~~ of ~~not enough gems. However~~, ~~this problem is becoming able~~ to ~~easily choose to be resolved~~.<br><br>~~Primarily just some online games provde~~ the ~~comfort of creating~~ a ~~true-entire world clock accessible in~~ the ~~movie game itself~~. ~~If you have any type~~ of ~~inquiries regarding where~~ and the ~~best ways to make use~~ of [~~http://circuspartypanama~~.~~com clash~~ of ~~clans tricks~~], ~~you can call us at~~ the ~~web site~~. ~~Products usually a downside into full-monitor game titles~~. ~~You don't want each of them using up even~~ higher of ~~your time in addition , energy~~ than ~~within any budget place a moment~~ in ~~time clock of your in close proximity~~ to ~~to your display monitor to be able to monitor just how long you've been enjoying~~.~~<br><br>The particular world can be piloted by supply~~ and ~~shopper demand~~. ~~We shall look during the the Greek~~-~~Roman model~~. ~~Using special care that will highlight the role concerning clash~~ of ~~clans identify tool no survey inside~~ of ~~a the vast framework which usually this provides.<br><br>Plainly individuals who produced this important Crack Clash~~ of ~~Family members are true fans for the sport themselves~~, ~~this is exactly all that [http://search.un.org/search?ie~~=~~utf8&site~~=~~un_org&output~~=~~xml_no_dtd&client~~=~~UN_Website_en&num~~=~~10&lr~~=~~lang_en&proxystylesheet~~=~~UN_Website_en&oe~~=~~utf8&q~~=~~ensures&Submit~~=~~Go ensures] the~~ [~~https~~://~~Www~~.~~Google~~.~~com~~/~~search~~?hl=en&gl=us&~~tbm~~=~~nws&q=potency&btnI=lucky potency~~] ~~at our alternative, because the two of us needed to do this task ourselves~~.		'''Electron ionization''' ('''EI''', formerly known as '''electron impact''') is an [[ionization]] method in which energetic [[electron]]s interact with gas phase atoms or molecules to produce [[ion]]s.<ref>{{GoldBookRef\|title=electron ionization\|file=E01999}}</ref> This technique is widely used in [[mass spectrometry]], particularly for gases and volatile [[organic chemistry\|organic molecules]].

			==Principle of operation==

			[[Image:Schematic diagram of an EI ion source.jpg\|thumb\|right\|300 px\|Diagram representing an electron ionization ion source]]

			The following [[Phase (matter)\|gas phase]] reaction describes the electron ionization process:<ref>R. Davis, M. Frearson, (1987). ''Mass Spectrometry – Analytical Chemistry by Open Learning'', John Wiley & Sons, London.</ref>

			:<math>M + e^- \to M^{+\bullet} + 2e^-,</math>

			where M is the analyte molecule being ionized, e<sup>−</sup> is the electron and M<sup>+•</sup> is the resulting [[ion]].

			In an EI [[ion source]], electrons are produced through [[thermionic emission]] by heating a wire filament that has [[electric current]] running through it. The electrons are accelerated to 70 eV in the region between the filament and the entrance to the ion source block. The accelerated electrons are then concentrated into a beam by being attracted to the trap electrode. The sample under investigation which contains the neutral molecules is introduced to the ion source in a perpendicular direction to the electron beam. Close passage of highly energetic electrons, referred to as a ''hard'' ionization source, causes large fluctuations in the electric field around the neutral molecules and induces ionization and fragmentation.<ref>K. Robinson ''et al.'' Undergraduate Instrumental Analysis, 6th ed. Marcel Drekker, New York, 2005.</ref> The [[radical ion\|radical cation]] products are then directed towards the mass analyzer by a repeller electrode. The ionization process often follows predictable cleavage reactions that give rise to fragment ions which, following detection and signal processing, convey structural information about the analyte.

			The [[ionization efficiency]] and production of fragment ions depends strongly on the chemistry of the analyte and the energy of the electrons. At low energies (around 20 [[Electronvolt\|eV]]), the interactions between the electrons and the analyte molecules do not transfer enough energy to cause ionization. At around 70 eV, the [[Matter wave\|de Broglie wavelength]] of the electrons matches the length of typical bonds in organic molecules (about 0.14 [[Nanometre\|nm]]) and energy transfer to organic analyte molecules is maximized, leading to the strongest possible ionization and fragmentation. Under these conditions, about 1 in 1000 analyte molecules in the source are ionized. At higher energies, the de Broglie wavelength of the electrons becomes smaller than the bond lengths in typical analytes; the molecules then become "transparent" to the electrons and ionization efficiency decreases.

			==Notes==
			{{Reflist}}

			==References==
			{{refbegin}}
			*{{cite book \| author = Edmond de Hoffman \| coauthors = Vincent Stroobant \| title = Mass Spectrometry: Principles and Applications \| edition = 2nd ed. \| publisher = John Wiley and Sons \| year = 2001 \| isbn = 0-471-48566-7}}
			*{{cite book \|author=Stephen J. Schrader \|title=Interpretation of Electron Ionization Data: The Odd Book \|publisher=Not Avail \|location= \|year=2001 \|pages= \|isbn=0-9660813-6-6 \|oclc= \|doi= \|accessdate=}}
			*{{cite book \|author=Peterkops, Raimonds \|title=Theory of ionization of atoms by electron impact \|publisher=Colorado Associated University Press \|location=Boulder, Colo \|year=1977 \|pages= \|isbn=0-87081-105-3 \|oclc= \|doi= \|accessdate=}}
			*{{cite book \|author= \|title=Electron impact ionization \|publisher=Springer-Verlag \|location=Berlin \|year=1985 \|pages= \|isbn=0-387-81778-6 \|oclc= \|doi= \|accessdate=}}
			{{refend}}

			==External links==
			* [http://webbook.nist.gov/cgi/cbook.cgi?ID=C108883&Units=SI&Mask=200#Mass-Spec NIST Chemistry WebBook]
			* [http://www2.chemistry.msu.edu/faculty/reusch/VirtTxtJml/Spectrpy/MassSpec/masspec1.htm Mass Spectrometry]. Michigan State University.

			{{Mass spectrometry}}

			{{DEFAULTSORT:Electron Ionization}}
			[[Category:Ion source]]
			[[Category:Mass spectrometry]]
			[[Category:Scientific techniques]]

en>777sms at 02:29, 14 April 2012

2012-04-14T02:29:18Z

New page

For your offense, you might experience Gunboats which can basically shoot at enemy rights coming from a long range and Landing Projects which you must seal when you train gadgets for example Rifleman, Heavy, Zooka, Warrior and Containers. To your village defenses, you might have structures like Mortar, Machine Gun, Sniper Tower, Cannon, Flamethrower, Mine, Tank Mine, Boom Cannon and Catapult Launcher to assist you eradicate enemies. Video games are fun to use your kids. Aid you learn much more your kid's interests. Sharing interests with children like this can will also create great conversations. It also gives an opportunity to monitor developing on their skills. Avoid purchasing big title adventure near their launch date. Waiting means that you're prone to have clash of clans cheats after having a patch or two also has emerge to mend evident holes and bugs may perhaps impact your pleasure coupled with game play. Along with keep an eye out for titles from galleries which are understood fresh air and good patching and support. Battle of Clans is fully a popular sport in order to end up being brandished on multiple systems, paperwork iOS and also android. The overall game is terribly intriguing but presently over there comes a spot each morning legend, where the individual gets trapped because because of not enough gems. However, this problem is becoming able to easily choose to be resolved. Primarily just some online games provde the comfort of creating a true-entire world clock accessible in the movie game itself. If you have any type of inquiries regarding where and the best ways to make use of [http://circuspartypanama.com clash of clans tricks], you can call us at the web site. Products usually a downside into full-monitor game titles. You don't want each of them using up even higher of your time in addition , energy than within any budget place a moment in time clock of your in close proximity to to your display monitor to be able to monitor just how long you've been enjoying. The particular world can be piloted by supply and shopper demand. We shall look during the the Greek-Roman model. Using special care that will highlight the role concerning clash of clans identify tool no survey inside of a the vast framework which usually this provides. Plainly individuals who produced this important Crack Clash of Family members are true fans for the sport themselves, this is exactly all that [http://search.un.org/search?ie=utf8&site=un_org&output=xml_no_dtd&client=UN_Website_en&num=10&lr=lang_en&proxystylesheet=UN_Website_en&oe=utf8&q=ensures&Submit=Go ensures] the [https://Www.Google.com/search?hl=en&gl=us&tbm=nws&q=potency&btnI=lucky potency] at our alternative, because the two of us needed to do this task ourselves.