Mass$507735$ - traduction vers grec
![[[Calutron]] mass spectrometers were used in the [[Manhattan Project]] for uranium enrichment.](https://commons.wikimedia.org/wiki/Special:FilePath/Alpha calutron tank.jpg?width=200 "[[Calutron]] mass spectrometers were used in the [[Manhattan Project]] for uranium enrichment.")
![[[Surface ionization]] source at the [[Argonne National Laboratory]] linear accelerator](https://commons.wikimedia.org/wiki/Special:FilePath/CARIBU at ATLAS.jpg?width=200 "[[Surface ionization]] source at the [[Argonne National Laboratory]] linear accelerator")
![Replica of [[F.W. Aston]]'s third mass spectrometer](https://commons.wikimedia.org/wiki/Special:FilePath/Early Mass Spectrometer (replica).jpg?width=200 "Replica of [[F.W. Aston]]'s third mass spectrometer")
![[[Indianapolis Museum of Art]] conservation scientist performing [[liquid chromatography–mass spectrometry]]](https://commons.wikimedia.org/wiki/Special:FilePath/IMA Conservation Science.jpg?width=200 "[[Indianapolis Museum of Art]] conservation scientist performing [[liquid chromatography–mass spectrometry]]")
 Mass spectrometer.jpg?width=200 "Fourier-transform ion cyclotron resonance mass spectrometer")
![TEGA]] mass spectrometer](https://commons.wikimedia.org/wiki/Special:FilePath/Rosy Red to TEGA.jpg?width=200 "TEGA]] mass spectrometer")
![MALDI]]](https://commons.wikimedia.org/wiki/Special:FilePath/TandemMS.svg?width=200 "MALDI]]")
![[[Toluene]] electron ionization mass spectrum](https://commons.wikimedia.org/wiki/Special:FilePath/Toluene ei ms.PNG?width=200 "[[Toluene]] electron ionization mass spectrum")
![WB-57]] high-altitude research aircraft](https://commons.wikimedia.org/wiki/Special:FilePath/WB-57 PALMS Mount.jpg?width=200 "WB-57]] high-altitude research aircraft")
![The assembly plant of the Bell Aircraft Corporation in 1944. Note parts of [[overhead crane]] at both sides of photo near top.](https://commons.wikimedia.org/wiki/Special:FilePath/Airacobra P39 Assembly LOC 02902u.jpg?width=200 "The assembly plant of the Bell Aircraft Corporation in 1944. Note parts of [[overhead crane]] at both sides of photo near top.")
![Mass production of [[Consolidated B-32 Dominator]] airplanes at [[Consolidated Aircraft]] Plant No. 4, near Fort Worth, Texas, during World War II](https://commons.wikimedia.org/wiki/Special:FilePath/Consolidated TB-32 production line.jpg?width=200 "Mass production of [[Consolidated B-32 Dominator]] airplanes at [[Consolidated Aircraft]] Plant No. 4, near Fort Worth, Texas, during World War II")
![museum in Yekaterinburg, Russia]].](https://commons.wikimedia.org/wiki/Special:FilePath/Литейная форма.jpg?width=200 "museum in Yekaterinburg, Russia]].")
![9/11]]](https://commons.wikimedia.org/wiki/Special:FilePath/911-Panel.JPG?width=200 "9/11]]")
![A magazine feature from ''Beauty Parade'' from March 1952 stereotyping women drivers. It features [[Bettie Page]] as the model.](https://commons.wikimedia.org/wiki/Special:FilePath/Bettie Page driving.jpg?width=200 "A magazine feature from ''Beauty Parade'' from March 1952 stereotyping women drivers. It features [[Bettie Page]] as the model.")
 01.jpg?width=200 "Shopping carts for children fitted with gaming computers")
![A family listening to a [[crystal radio]] in the 1920s](https://commons.wikimedia.org/wiki/Special:FilePath/Crystal radio advertisement.png?width=200 "A family listening to a [[crystal radio]] in the 1920s")
![Political advertisements on a billboard in the [[Netherlands]] in 2019](https://commons.wikimedia.org/wiki/Special:FilePath/Dutch provinces elections billboard, Oude Pekela (2019) 02.jpg?width=200 "Political advertisements on a billboard in the [[Netherlands]] in 2019")
![A member of staff at the [[International Printing Museum]] demonstrates printing with a 19th-century, hand-operated [[Columbian press]]](https://commons.wikimedia.org/wiki/Special:FilePath/PrintMus 081.jpg?width=200 "A member of staff at the [[International Printing Museum]] demonstrates printing with a 19th-century, hand-operated [[Columbian press]]")
![Egyptian movie star [[Salah Zulfikar]] on the cover of Al-Kawakeb magazine, March 1961, an example of mass media.](https://commons.wikimedia.org/wiki/Special:FilePath/Salahzulfikar1961.jpg?width=200 "Egyptian movie star [[Salah Zulfikar]] on the cover of Al-Kawakeb magazine, March 1961, an example of mass media.")
![American political cartoon titled ''The Usual Irish Way of Doing Things'', depicting a drunken Irishman lighting a powder keg and swinging a bottle. Published in ''[[Harper's Weekly]]'', 1871](https://commons.wikimedia.org/wiki/Special:FilePath/TheUsualIrishWayofDoingThings (cr).jpg?width=200 "American political cartoon titled ''The Usual Irish Way of Doing Things'', depicting a drunken Irishman lighting a powder keg and swinging a bottle. Published in ''[[Harper's Weekly]]'', 1871")
![Early [[minstrel shows]] lampooned the assumed stupidity of black people. Detail from cover of ''The Celebrated Negro Melodies, as Sung by the Virginia Minstrels'', 1843](https://commons.wikimedia.org/wiki/Special:FilePath/Virginia Minstrels, 1843.jpg?width=200 "Early [[minstrel shows]] lampooned the assumed stupidity of black people. Detail from cover of ''The Celebrated Negro Melodies, as Sung by the Virginia Minstrels'', 1843")
Définition
Wikipédia
Mass spectrometry (MS) is an analytical technique that is used to measure the mass-to-charge ratio of ions. The results are presented as a mass spectrum, a plot of intensity as a function of the mass-to-charge ratio. Mass spectrometry is used in many different fields and is applied to pure samples as well as complex mixtures.
A mass spectrum is a type of plot of the ion signal as a function of the mass-to-charge ratio. These spectra are used to determine the elemental or isotopic signature of a sample, the masses of particles and of molecules, and to elucidate the chemical identity or structure of molecules and other chemical compounds.
In a typical MS procedure, a sample, which may be solid, liquid, or gaseous, is ionized, for example by bombarding it with a beam of electrons. This may cause some of the sample's molecules to break up into positively charged fragments or simply become positively charged without fragmenting. These ions (fragments) are then separated according to their mass-to-charge ratio, for example by accelerating them and subjecting them to an electric or magnetic field: ions of the same mass-to-charge ratio will undergo the same amount of deflection. The ions are detected by a mechanism capable of detecting charged particles, such as an electron multiplier. Results are displayed as spectra of the signal intensity of detected ions as a function of the mass-to-charge ratio. The atoms or molecules in the sample can be identified by correlating known masses (e.g. an entire molecule) to the identified masses or through a characteristic fragmentation pattern.
