en>Yobot: /* Predictions in science */WP:CHECKWIKI errors fixed + general fixes using AWB (8961)

2013-03-07T19:55:39Z

Predictions in science: WP:CHECKWIKI errors fixed + general fixes using AWB (8961)

← Older revision		Revision as of 21:55, 7 March 2013
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	If a ~~person~~ a ~~girly girl~~, ~~want would be sure too preserve with~~ the ~~fashion trends~~. ~~Today, you are usually able to obtain~~ the ~~latest fashion trend~~ in ~~nearby mall~~. ~~Sometimes your local mall may want~~ more ~~money than need to to afford to pay~~ for ~~that shirt~~ or ~~pants you own~~. If the ~~actual reason being~~ the case, ~~then you will need know presently there are plenty of of great web sites you often be able to arrive in order~~ to ~~discover~~ the ~~latest fashion trend~~.~~<br><br>ugg news Fourthly~~, ~~you can smell a pair~~ of ~~boots~~. ~~I do advise one to take~~ a ~~whiff anyone decide to put in it~~. ~~Besides~~, ~~you must not confuse scent~~ of ~~private foot an issue odor in~~ the ~~chemicals~~ in the ~~old days color synthetic fabrics~~. The ~~scent resembles~~ that of ~~paint along~~ with ~~the original boots are obviously odorless~~.<br><br>~~The original ugg boots were popular among surfers, hikers and outdoor types~~. ~~Although these nonetheless some~~ of ~~UGG's customers~~, ~~these days you will find all involving people appreciating these comfortable sheepskin hunter wellingtons~~. ~~UGG now possesses varied spread~~ of ~~styles~~. ~~Their boots through useful~~ to ~~chic~~. ~~Factors~~ are some ~~designs~~ of ~~ugg boots that you're find soothing~~.~~<br><br>The obvious solution for this problem in order~~ to ~~wear boot styles~~. ~~However~~, ~~they must halt cheap boots occuring at discount stores, otherwise they'll wear out quickly~~ and ~~also the joint belonging~~ to the ~~sole~~ for ~~the boot proper will be~~ an ~~entrance~~ for also ~~rocks and burs however for dirt and small~~, ~~unpleasant creatures~~. ~~Quality boots are technique~~ to ~~ensure they will not wear out~~ and ~~let things in through~~ the ~~seams~~.~~<br><br>~~The ~~place~~ is ~~scattered with children's furniture~~ and ~~rotting foods. But Henry doesn't have time~~ to ~~take each morning details~~. ~~He hears something rattle above him. Your next instant~~, ~~a carton filled up with dishes explodes beside him~~, ~~making a deafening reverberation~~. ~~It has missed him~~ by ~~less than an~~ in. ~~From across~~ the ~~space~~, ~~a magazine case hurtles toward him~~, ~~scraping down~~ the ~~floor~~, ~~toppling and spilling its load~~, ~~but still continuing toward him~~ with ~~furious speed and unwavering determination~~. ~~Scampering backwards~~, ~~Henry drops from opening behind him~~. ~~Nothing breaks his fall~~. ~~Nothing softens getting this done~~.<br>~~<br>Your wedding guests will truly love this chocolate wedding favor~~. ~~Into my final weeks in the office~~, ~~I remembered essential it may just be to truly connect with other sites~~. ~~He so want to grab your feedback about articles published by him~~. ~~Style her hair in pigtail braids and tie pink ribbons within ends~~. ~~By using~~ a ~~whole lot many new designs up~~ for ~~the hype for that upcoming~~ year, ~~it's a suitable time for youngsters opt a few through leading selection of cowboy boots and other casual footwear such as tall boots~~, ~~ankle boots~~, ~~work boots for both people~~, ~~waterproof boots~~, in ~~conjunction~~ with ~~a lot additional information~~.~~<br><br>Should you have almost any queries~~ with ~~regards to where by and also how you can work with [http:~~/~~/horizonafrica~~.~~com~~/~~img/ ugg outlet~~]~~, it is possible to e-mail us in our own web-site.~~		'''Atmospheric pressure laser ionization''' is an atmospheric pressure [[ionization]] method for [[Mass spectrometry\|mass spectrometry (MS)]]. [[Laser]] light in the UV range is used to ionize molecules in a [[REMPI\|resonance-enhanced multiphoton ionization (REMPI)]] process. It is a selective and sensitive ionization method for aromatic and polyaromatic compounds.

			== Ionization principle ==
			[[File:APLI mechanism.png\|thumb\|APLI Ionization Mechanism: A molecule '''M''' is brought from the electronic ground state into an electronically excited state '''A''' by the absorption of a photon if the energy of the photon fits to the energy of an excited state. The molecule relaxes afterwards or by the absorption of a second photon at sufficiently high photon fluxes, the ionization potential is reached: One electron is removed from the molecule and a radical-cation is formed. For efficient ionization by the absorption of two photons a high density of electronic states in the intermediate region is necessary.]]

			The excitation of electrons in atoms and molecules by the absorption of one ore more photons can be sufficient for the spatial separation of the electron and the atom or molecule. In the gas phase, this process is called [[Photoelectrochemical_processes#Photoionization\|Photoionization]]. The combined energy of the absorbed photons in this process must be above the ionization potential of the atom or molecule.

			In the simplest case, a single photon has sufficient energy to overcome the ionization potential. This process is therefore called single photon ionization, it is the basic principle of [[Atmospheric pressure photo ionization]] (APPI).
			For sufficiently high power densities of the incident light also nonlinear absorption processes like the absorption of at least two photons in a rapid sequence via virtual or real states can occur. If the combined energy of the absorbed photons is higher than the ionization potential, this multiphoton absorption process can also lead to ionization of the atom or molecule. This process is called '''multi photon ionization''' (MPI).

			The laser light sources used in APLI have power densities which allow multiphoton ionization via stable electronic states of the molecule or atom.
			The required power density has to be sufficiently high, so that in the lifetime of the first reached electronic state, which is in the range of a few nanoseconds, a second photon can be absorbed with a reasonable probability.
			Then a radical cation is formed:
			:<math>\mathrm{M \xrightarrow[]{h\nu\ (5\ \text{eV})} M^* \xrightarrow[]{h\nu\ (5\ \text{eV})} M^{+ \cdot}+ e^-}</math>

			This process is called [[REMPI\|"resonance enhanced multi photon ionization" (REMPI)]]. In the case of APLI both absorbed photons have the same wavelength, which is called "1+1 REMPI".

			Most of the organic molecules which are favorable for a photoionization method have ionization potentials smaller than approximately 10 eV. Thus APLI utilizes light with a photon energy of around 5 eV which corresponds to a wavelength of about 250 nm, which is in the ultraviolet (UV) part of the electromagnetic spectrum.

			Typical laser systems used in APLI are [[Krypton fluoride laser\|Kryptonfluoride-Excimer laser]] (λ = 248 nm) and frequency quadrupled [[Nd:YAG laser]] (λ = 266 nm).

			== Characteristics ==
			APLI has some special characteristics because of the ionization with UV-laser-light:

			=== Easy to couple ===
			It is relatively simple to couple an existing atmospheric pressure (AP) [[ion source]] with APLI. In principle only the ionizing laser light has to be coupled into the existing ion source trough UV transparent windows.

			=== Selectivity ===
			APLI is s selective ionization method, because the 1+1 REMPI ionization requires an adequate existing electronic intermediate state and both electronic transitions have to be quantum mechanically allowed.

			In particular polynuclear aromatic compounds fulfil the spectroscopic requirements for 1+1 REMPI, thus APLI is an ideal ionization method for the detection of [[Polycyclic aromatic hydrocarbon\|polyaromatic hydro carbons (PAH)]].

			The selectivity is also a disadvantage, if the direct ionization of an analyte molecule is not possible with APLI. In this case, the analyte molecule could be chemically coupled with a label molecule which is sensitive to APLI. If such a derivatization reaction is available, the selectivity of APLI can be broadened to other molecule classes.

			=== High sensitivity ===
			[[File:APLI solvent cross sections en.png\|thumb\|Absorption cross sections of Nitrogen, Oxygen and some common LC-Solvents at the ionization energies of APPI (10 eV) and APLI (5 eV). The light utilized by APPI is strongly absorbed by substances in the ion source (oxygen and solvent vapor)]]
			In comparison to the single photon ionization (APPI) with vacuum ultraviolet light (λ = 128 nm) APLI is much more sensitive, in particular in applications with liquid chromatography (LC-MS).
			The selectivity of APLI is one cause of this effect, but under these conditions, APPI suffers from another effect. The VUV light utilized by APPI does not penetrate deep into the ion source geometry, because the solvents used by LC, which are present as vapor in the ion source, strongly absorb the VUV light. For the UV light of APLI the LC solvents are virtually transparent, thus APLI allows the generation of ions in the entire ion source volume.

			=== Independence of ion formation from electrical fields ===

			In contrast to other ionization methods like [[Electrospray ionization\|(Electrospray-Ionization (ESI)]] and [[Atmospheric-pressure chemical ionization\| Atmospheric-pressure chemical ionization (APCI)]], APLI allows the generation of ions independent from electrical fields, because the zone of ion formation is only governed by the laser light.
			This allows some special methods, like the measurement of the spatial resolved ion signal (Distribution of Ion Acceptance - DIA) with APLI for example, which is applied in the development of new ion sources.<ref name="DIA_paper">{{cite journal\|author=Matthias Lorenz, Ralf Schiewek, Klaus J. Brockmann, Oliver J. Schmitz, Siegmar Gäb, Thorsten Benter\|title=The Distribution of Ion Acceptance in Atmospheric Pressure Ion Sources: Spatially Resolved APLI Measurements\|journal=Journal of the American Society for Mass Spectrometry\|volume=19\|issue=3\|year=2008\|pages=400–410\|doi=10.1016/j.jasms.2007.11.021}}</ref>

			== Literature ==
			*{{cite journal\|author=M. Constapel, M. Schellenträger, O. J Schmitz, S. Gäb, K. J Brockmann, R. Giese, Th Benter\|title=Atmospheric‐pressure laser ionization: a novel ionization method for liquid chromatography/mass spectrometry\|journal=Rapid Communications in Mass Spectrometry\|volume=19\|issue=3\|year=2005\|pages=326–336\|doi=10.1002/rcm.1789}}
			*{{cite journal\|author=Stefan Droste, Marc Schellenträger, Marc Constapel, Siegmar Gäb, Matthias Lorenz, Klaus J Brockmann, Thorsten Benter, Dieter Lubda, Oliver J Schmitz\|title=A silica‐based monolithic column in capillary HPLC and CEC coupled with ESI‐MS or electrospray‐atmospheric‐pressure laser ionization‐MS\|journal=ELECTROPHORESIS\|volume=26\|issue=21\|year=2005\|pages=4098–4103\|doi=10.1002/elps.200500326\|pmid=16252331}}
			*{{cite journal\|author=R. Schiewek, M. Schellenträger, R. Mönnikes, M. Lorenz, R. Giese, K. J. Brockmann, S. Gäb, Th. Benter, O. J. Schmitz\|title=Ultrasensitive Determination of Polycyclic Aromatic Compounds with Atmospheric-Pressure Laser Ionization as an Interface for GC/MS\|journal=Analytical Chemistry\|volume=79\|issue=11\|year=2007\|pages=4135–4140\|doi=10.1021/ac0700631}}

			== References ==
			{{Reflist}}

			{{Mass spectrometry}}
			{{lasers}}

			[[Category:Ion source]]

en>Melcombe: {{Primary sources|date=January 2012}}

2012-01-11T23:33:51Z

{{Primary sources|date=January 2012}}

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If a person a girly girl, want would be sure too preserve with the fashion trends. Today, you are usually able to obtain the latest fashion trend in nearby mall. Sometimes your local mall may want more money than need to to afford to pay for that shirt or pants you own. If the actual reason being the case, then you will need know presently there are plenty of of great web sites you often be able to arrive in order to discover the latest fashion trend. ugg news Fourthly, you can smell a pair of boots. I do advise one to take a whiff anyone decide to put in it. Besides, you must not confuse scent of private foot an issue odor in the chemicals in the old days color synthetic fabrics. The scent resembles that of paint along with the original boots are obviously odorless. The original ugg boots were popular among surfers, hikers and outdoor types. Although these nonetheless some of UGG's customers, these days you will find all involving people appreciating these comfortable sheepskin hunter wellingtons. UGG now possesses varied spread of styles. Their boots through useful to chic. Factors are some designs of ugg boots that you're find soothing. The obvious solution for this problem in order to wear boot styles. However, they must halt cheap boots occuring at discount stores, otherwise they'll wear out quickly and also the joint belonging to the sole for the boot proper will be an entrance for also rocks and burs however for dirt and small, unpleasant creatures. Quality boots are technique to ensure they will not wear out and let things in through the seams. The place is scattered with children's furniture and rotting foods. But Henry doesn't have time to take each morning details. He hears something rattle above him. Your next instant, a carton filled up with dishes explodes beside him, making a deafening reverberation. It has missed him by less than an in. From across the space, a magazine case hurtles toward him, scraping down the floor, toppling and spilling its load, but still continuing toward him with furious speed and unwavering determination. Scampering backwards, Henry drops from opening behind him. Nothing breaks his fall. Nothing softens getting this done. Your wedding guests will truly love this chocolate wedding favor. Into my final weeks in the office, I remembered essential it may just be to truly connect with other sites. He so want to grab your feedback about articles published by him. Style her hair in pigtail braids and tie pink ribbons within ends. By using a whole lot many new designs up for the hype for that upcoming year, it's a suitable time for youngsters opt a few through leading selection of cowboy boots and other casual footwear such as tall boots, ankle boots, work boots for both people, waterproof boots, in conjunction with a lot additional information. Should you have almost any queries with regards to where by and also how you can work with [http://horizonafrica.com/img/ ugg outlet], it is possible to e-mail us in our own web-site.

Stochastic prediction procedure - Revision history

en>Yobot: /* Predictions in science */WP:CHECKWIKI errors fixed + general fixes using AWB (8961)

en>Melcombe: {{Primary sources|date=January 2012}}