Pupillary light reflex - Revision history

en>Neøn: Undid revisions by User:Medphysik15 (talk)

2014-11-19T04:49:00Z

Undid revisions by User:Medphysik15 (talk)

← Older revision		Revision as of 06:49, 19 November 2014
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en>HiYahhFriend at 08:58, 24 February 2014

2014-02-24T08:58:43Z

← Older revision		Revision as of 10:58, 24 February 2014
Line 1:		Line 1:
	~~[[File:ARPESgeneral.png\|thumb\|340px\|Principle~~ of ~~angle resolved photoelectron spectroscopy]]~~		On top of the Clash of Clans hack tool; there could be also hack tools for other games. People young and old can check out those hacks and obtain the people which they need. It is sure may will have lost to do with fun once they provide the hack tool that they can.<br><br>If you've got to reload their arms when playing collide of clans hack and that's shooting entailed, always get cover first. It genuinely is common for the members to be gunned low while a reload might be happening, and you see helplessly. Do Not really let it happen a person! Find somewhere and conceal before you start to reload.<br><br>Avoid purchasing big title adventure near their launch dating. Waiting means that you're prone to gather clash of clans cheats after developing a patch or two also has emerge to mend evident holes and bugs that impact your pleasure along with game play. Additionally keep an eye out for titles from broadcasters which are understood nourishment, clean patching and support.<br><br>Include note of how money your teen is without question shelling out for gambling. These kinds towards products aren't cheap but then there is absolutely the option of deciding on much more add-ons found in the game itself. Establish month-to-month and yearly restrictions on the share of money that is likely to be spent on console games. Also, have conversations for the youngsters about financing.<br><br>Plan not only provides execute tools, there is perhaps even Clash of Clans identify no survey by individual. Strict anti ban system hand it over to users to utilize pounds and play without an hindrance. If manufacturers are interested in receiving the program, they are definitely required to visit fantastic site and obtain each of our hack tool trainer actually. The name of the internet page is Amazing Cheats. A number of web-sites have different types created by software by which those can get past a difficult situation stages in the video game.<br><br>Video gaming is infiltrating houses around the world. Some play these games for work, on the other hand others play them for enjoyment. If you liked this post and you would like to obtain extra data with regards to [http://prometeu.net clash of clans cheat no survey] kindly pay a visit to our page. This organization is booming and won't end anytime soon. Maintain reading for some fantastic recommendations on gaming.<br><br>Now you have read this composition, you need to a great easier time locating then loving video games in your lifetime. Notwithstanding your favored platform, from your cellphone in your own own computer, playing and enjoying video gaming enable you to take the benefit of the worries of the [http://Answers.yahoo.com/search/search_result?p=actual+busy&submit-go=Search+Y!+Answers actual busy] week get more info.
	~~'''Photoemission spectroscopy (PES)''',~~ also ~~known as '''photoelectron spectroscopy''',~~<~~ref~~>~~{{GoldBookRef\|title=photoelectron spectroscopy (PES)\|file=P04609}}~~<~~/ref~~> ~~refers~~ to ~~energy measurement~~ of ~~electrons emitted from solids~~, ~~gases or liquids by~~ the ~~[[photoelectric effect]], in order~~ to ~~determine the binding energies of electrons in~~ a ~~substance~~. ~~The term refers~~ to various techniques, depending on whether the [[ionization]] energy is provided by an [[X-ray]] [[photon]], an [[Extreme ultraviolet\|EUV]] photon, or an [[ultraviolet]] photon. Regardless of the incident photon beam however, all photoelectron spectroscopy revolves around the general theme of surface analysis by measuring the ejected electrons.<~~ref name=Hercules84~~>~~{{cite journal\|doi= 10.1021/ed061p402\|~~title~~= Analytical chemistry of surfaces~~. ~~Part I. General aspects \|year=1984\|last1=Hercules\|first1=D. M.\|last2=Hercules\|first2=S.H. Al\|journal=Journal~~ of ~~Chemical Education\|volume=61\|pages=402\|bibcode = 1984JChEd~~..~~61..402H\|issue= 5 }}~~<~~/ref~~>

	~~[[X-ray photoelectron spectroscopy]] (XPS) was developed by [[Kai Siegbahn]] starting in 1957~~ <~~ref~~>~~{{cite journal\|doi=10.1103/PhysRev.105.1676\|title=Precision Method~~ for Obtaining Absolute Values of Atomic Binding Energies\|year=1957\|last1=Nordling\|first1=Carl\|last2=Sokolowski\|first2=Evelyn\|last3=Siegbahn\|first3=Kai\|journal=Physical Review\|volume=105\|pages=1676\|bibcode = 1957PhRv.~~.105.1676N\|issue=5 }}</ref><ref>{{cite journal \|author=Sokolowski E., Nordling C., Siegbahn K. \|journal=Ark. Fysik. \|volume=12 \|pages=301 \|year=1957 }}</ref> and~~ is ~~used to study~~ the ~~energy levels~~ of ~~atomic core electrons, primarily~~ in ~~solids~~. ~~Siegbahn referred~~ to ~~the technique as Electron Spectroscopy for Chemical Analysis (ESCA), since the core levels have small [[Chemical shift#Other chemical shifts\|chemical shifts]] depending~~ on the ~~chemical environment~~ of ~~the atom which~~ is ~~ionized, allowing chemical structure~~ to be ~~determined~~. ~~Siegbahn was awarded the [[Nobel Prize]] in 1981 for this work. XPS is sometimes referred to as PESIS (photoelectron spectroscopy~~ for ~~inner shells) whereas~~ the ~~lower-energy radiation of UV light is referred to as PESOS (outer shells) because it cannot excite core electrons~~.<~~ref~~>~~{{cite book\| title= Introduction to Photoelectron Spectroscopy\|year=1983\|last1=Ghosh\|first1=P.K.\|publisher= John Wiley & Sons \|isbn=0-471-06427-0}}~~<~~/ref~~>

	~~In the ultraviolet region~~, ~~the method~~ is ~~usually referred to as photoelectron spectroscopy for the study~~ of ~~gases, and photoemission spectroscopy for solid surfaces~~.

	~~[[Ultraviolet photoelectron spectroscopy]] (UPS) is used~~ to ~~study valence energy levels~~ and ~~chemical bonding; especially the bonding character of molecular orbitals~~. ~~The method was developed originally for gas-phase molecules~~ in ~~1962 by [[David W. Turner]]~~,~~<ref>{{cite journal\|doi=10.1063/1.1733134\|title=Determination~~ of ~~Ionization Potentials by Photoelectron Energy Measurement\|year=1962\|last1=Turner\|first1=D. W~~.~~\|last2=Jobory\|first2=M. I. Al\|journal=~~The ~~Journal~~ of ~~Chemical Physics\|volume=37\|pages=3007\|bibcode = 1962JChPh~~.~~.37.3007T\|issue=12 }}</ref> and other early workers included David C.Frost, J.H.D. Eland and K. Kimura. Later, [[Richard Smalley]] modified the technique and used~~ a ~~UV laser to excite the sample,~~ in ~~order to measure the binding energy of electrons in gaseous molecular clusters.~~

	~~Extreme ultraviolet photoelectron spectroscopy (EUPS) lies in between XPS and UPS. It is typically used to assess~~ the ~~valence band structure~~.<~~ref~~>{{cite journal\|url=http://www.physik.uni-kl.de/aeschlimann/pdf/paper_00000012.pdf \|doi=10.1103/PhysRevLett.87.025501\|title=Direct Observation of Surface Chemistry Using Ultrafast Soft-X-Ray Pulses\|year=2001\|last1=Bauer\|first1=M.\|last2=Lei\|first2=C.\|last3=Read\|first3=K.\|last4=Tobey\|first4=R.\|last5=Gland\|first5=J.\|last6=Murnane\|first6=M.\|last7=Kapteyn\|first7=H.\|journal=Physical Review Letters\|volume=87\|pages=025501\|bibcode=2001PhRvL..87b5501B\|issue=2}}<~~/ref~~> ~~Compared to XPS it gives better energy resolution, and compared to UPS the ejected electrons are faster, resulting in a better spectrum signal.~~

	~~==Physical principle==~~
	~~The physics behind the PES technique~~ is ~~an application of~~ the ~~[[photoelectric effect]]~~. The sample is exposed to a beam of UV or XUV light inducing photoelectric ionization. The energies of the emitted photoelectrons are characteristic of their original electronic states, and depend also on vibrational state and rotational level. For solids, ~~photoelectrons can escape only from a depth~~ on the ~~order of nanometers, so that it is the surface layer which is analyzed.~~

	~~Because of the high frequency of the light, and the substantial charge and energy of emitted electrons, photoemission is one of the most sensitive and accurate techniques~~ for ~~measuring the energies and shapes of electronic states and molecular and atomic orbitals~~. ~~Photoemission is also among the most sensitive methods of detecting substances in trace concentrations, provided the sample is compatible with ultra-high vacuum~~ and ~~the analyte can be distinguished from background.~~

	~~Typical PES (UPS) instruments use helium gas sources of UV light,~~ with ~~photon energy up~~ to ~~52 eV (corresponding to wavelength 23.7 nm)~~. ~~The photoelectrons that actually escaped into the vacuum are collected, energy resolved, slightly retarded and counted, which results in a spectrum~~ of ~~electron intensity as~~ a function of the measured kinetic energy. Because binding energy values are more readily applied and understood, the kinetic energy values, which are source dependent, are converted into binding energy values, which are source independent. This is ~~achieved by applying Einstein~~'~~s relation <math>E_k=h\nu-E_B</math>~~. ~~The~~ <~~math~~>~~h\nu~~<~~/math~~> ~~term of~~ this ~~equation is due~~ to ~~the energy (frequency) of the UV light that bombards the sample~~. ~~Photoemission spectra are also measured using [[synchrotron radiation]] sources.~~

	~~The binding energies of the measured electrons are characteristic of~~ the ~~chemical structure and molecular bonding~~ of the ~~material. By adding a source monochromator and increasing the energy resolution~~ of the ~~electron analyzer, peaks appear with [[full width at half maximum]] (FWHM) less than 5–8 meV.~~

	~~==See also==~~
	*[[Angle resolved photoemission spectroscopy]] AR-PES
	*[[Inverse photoemission spectroscopy]] IPS
	*[[Ultra high vacuum]] UHV
	*[[X-ray photoelectron spectroscopy]] XPS
	*[[Ultraviolet photoelectron spectroscopy]] UPS
	*[[Vibronic spectroscopy]]

	~~==References==~~
	~~{{Reflist}}~~

	~~==External links==~~
	*[http://~~people~~.~~physik~~.~~hu-berlin.de~~/~~~kreier~~/~~seminar/20070514~~.~~pdf Presentation] on principle of [[ARPES]]~~

	~~{{DEFAULTSORT:Photoemission Spectroscopy}}~~
	~~[[Category:Emission spectroscopy]]~~

en>Monkbot: /* Clinical significance */Fix CS1 deprecated date parameter errors

2014-01-29T00:09:47Z

Clinical significance: Fix CS1 deprecated date parameter errors

← Older revision		Revision as of 02:09, 29 January 2014
Line 1:		Line 1:
	~~Hello! I am Emmett~~. ~~I smile that I can unite~~ to the ~~entire globe~~. I ~~live~~ in ~~Germany~~, in the ~~BY region~~. ~~I dream~~ to ~~head~~ to the ~~different countries~~, to ~~obtain acquainted with interesting people~~.<br><br>~~my blog post :: 4inkjets Coupon Code Promotions~~ ([http://~~drive~~.~~ilovetheory~~.~~com~~/~~content~~/~~4inkjets~~-~~coupon~~-~~code~~-~~tips~~-~~put~~-~~money~~-~~back~~-~~your-wallet additional reading~~])		[[File:ARPESgeneral.png\|thumb\|340px\|Principle of angle resolved photoelectron spectroscopy]]
			'''Photoemission spectroscopy (PES)''', also known as '''photoelectron spectroscopy''',<ref>{{GoldBookRef\|title=photoelectron spectroscopy (PES)\|file=P04609}}</ref> refers to energy measurement of electrons emitted from solids, gases or liquids by the [[photoelectric effect]], in order to determine the binding energies of electrons in a substance. The term refers to various techniques, depending on whether the [[ionization]] energy is provided by an [[X-ray]] [[photon]], an [[Extreme ultraviolet\|EUV]] photon, or an [[ultraviolet]] photon. Regardless of the incident photon beam however, all photoelectron spectroscopy revolves around the general theme of surface analysis by measuring the ejected electrons.<ref name=Hercules84>{{cite journal\|doi= 10.1021/ed061p402\|title= Analytical chemistry of surfaces. Part I. General aspects \|year=1984\|last1=Hercules\|first1=D. M.\|last2=Hercules\|first2=S.H. Al\|journal=Journal of Chemical Education\|volume=61\|pages=402\|bibcode = 1984JChEd..61..402H\|issue= 5 }}</ref>

			[[X-ray photoelectron spectroscopy]] (XPS) was developed by [[Kai Siegbahn]] starting in 1957 <ref>{{cite journal\|doi=10.1103/PhysRev.105.1676\|title=Precision Method for Obtaining Absolute Values of Atomic Binding Energies\|year=1957\|last1=Nordling\|first1=Carl\|last2=Sokolowski\|first2=Evelyn\|last3=Siegbahn\|first3=Kai\|journal=Physical Review\|volume=105\|pages=1676\|bibcode = 1957PhRv..105.1676N\|issue=5 }}</ref><ref>{{cite journal \|author=Sokolowski E., Nordling C., Siegbahn K. \|journal=Ark. Fysik. \|volume=12 \|pages=301 \|year=1957 }}</ref> and is used to study the energy levels of atomic core electrons, primarily in solids. Siegbahn referred to the technique as Electron Spectroscopy for Chemical Analysis (ESCA), since the core levels have small [[Chemical shift#Other chemical shifts\|chemical shifts]] depending on the chemical environment of the atom which is ionized, allowing chemical structure to be determined. Siegbahn was awarded the [[Nobel Prize]] in 1981 for this work. XPS is sometimes referred to as PESIS (photoelectron spectroscopy for inner shells) whereas the lower-energy radiation of UV light is referred to as PESOS (outer shells) because it cannot excite core electrons.<ref>{{cite book\| title= Introduction to Photoelectron Spectroscopy\|year=1983\|last1=Ghosh\|first1=P.K.\|publisher= John Wiley & Sons \|isbn=0-471-06427-0}}</ref>

			In the ultraviolet region, the method is usually referred to as photoelectron spectroscopy for the study of gases, and photoemission spectroscopy for solid surfaces.

			[[Ultraviolet photoelectron spectroscopy]] (UPS) is used to study valence energy levels and chemical bonding; especially the bonding character of molecular orbitals. The method was developed originally for gas-phase molecules in 1962 by [[David W. Turner]],<ref>{{cite journal\|doi=10.1063/1.1733134\|title=Determination of Ionization Potentials by Photoelectron Energy Measurement\|year=1962\|last1=Turner\|first1=D. W.\|last2=Jobory\|first2=M. I. Al\|journal=The Journal of Chemical Physics\|volume=37\|pages=3007\|bibcode = 1962JChPh..37.3007T\|issue=12 }}</ref> and other early workers included David C.Frost, J.H.D. Eland and K. Kimura. Later, [[Richard Smalley]] modified the technique and used a UV laser to excite the sample, in order to measure the binding energy of electrons in gaseous molecular clusters.

			Extreme ultraviolet photoelectron spectroscopy (EUPS) lies in between XPS and UPS. It is typically used to assess the valence band structure.<ref>{{cite journal\|url=http://www.physik.uni-kl.de/aeschlimann/pdf/paper_00000012.pdf \|doi=10.1103/PhysRevLett.87.025501\|title=Direct Observation of Surface Chemistry Using Ultrafast Soft-X-Ray Pulses\|year=2001\|last1=Bauer\|first1=M.\|last2=Lei\|first2=C.\|last3=Read\|first3=K.\|last4=Tobey\|first4=R.\|last5=Gland\|first5=J.\|last6=Murnane\|first6=M.\|last7=Kapteyn\|first7=H.\|journal=Physical Review Letters\|volume=87\|pages=025501\|bibcode=2001PhRvL..87b5501B\|issue=2}}</ref> Compared to XPS it gives better energy resolution, and compared to UPS the ejected electrons are faster, resulting in a better spectrum signal.

			==Physical principle==
			The physics behind the PES technique is an application of the [[photoelectric effect]]. The sample is exposed to a beam of UV or XUV light inducing photoelectric ionization. The energies of the emitted photoelectrons are characteristic of their original electronic states, and depend also on vibrational state and rotational level. For solids, photoelectrons can escape only from a depth on the order of nanometers, so that it is the surface layer which is analyzed.

			Because of the high frequency of the light, and the substantial charge and energy of emitted electrons, photoemission is one of the most sensitive and accurate techniques for measuring the energies and shapes of electronic states and molecular and atomic orbitals. Photoemission is also among the most sensitive methods of detecting substances in trace concentrations, provided the sample is compatible with ultra-high vacuum and the analyte can be distinguished from background.

			Typical PES (UPS) instruments use helium gas sources of UV light, with photon energy up to 52 eV (corresponding to wavelength 23.7 nm). The photoelectrons that actually escaped into the vacuum are collected, energy resolved, slightly retarded and counted, which results in a spectrum of electron intensity as a function of the measured kinetic energy. Because binding energy values are more readily applied and understood, the kinetic energy values, which are source dependent, are converted into binding energy values, which are source independent. This is achieved by applying Einstein's relation <math>E_k=h\nu-E_B</math>. The <math>h\nu</math> term of this equation is due to the energy (frequency) of the UV light that bombards the sample. Photoemission spectra are also measured using [[synchrotron radiation]] sources.

			The binding energies of the measured electrons are characteristic of the chemical structure and molecular bonding of the material. By adding a source monochromator and increasing the energy resolution of the electron analyzer, peaks appear with [[full width at half maximum]] (FWHM) less than 5–8 meV.

			==See also==
			*[[Angle resolved photoemission spectroscopy]] AR-PES
			*[[Inverse photoemission spectroscopy]] IPS
			*[[Ultra high vacuum]] UHV
			*[[X-ray photoelectron spectroscopy]] XPS
			*[[Ultraviolet photoelectron spectroscopy]] UPS
			*[[Vibronic spectroscopy]]

			==References==
			{{Reflist}}

			==External links==
			*[http://people.physik.hu-berlin.de/~kreier/seminar/20070514.pdf Presentation] on principle of [[ARPES]]

			{{DEFAULTSORT:Photoemission Spectroscopy}}
			[[Category:Emission spectroscopy]]

en>000peter: correcting and increasing size of thumbnail, but with smaller image resolution (less data)

2012-07-19T00:09:27Z

correcting and increasing size of thumbnail, but with smaller image resolution (less data)

New page

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