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Desorption electrospray ionization
Desorption electrospray ionization (DESI) is a method for creating ions that can be used in mass spectrometry for chemical analysis. In DESI, an electrospray source creates charged droplets that are directed at a solid sample a few millimeters to a few centimeters away. The charged droplets pick up the sample through interaction with the surface and then form highly charged ions that can be sampled into a mass spectrometer.[1] Additional recommended knowledge
Related techniquesSeveral variations of desorption electrospray have been reported.[2] Chemical ionization
Desorption atmospheric pressure chemical ionization (DAPCI) uses a flow of solvent vapor and a corona discharge to affect ionization.[3] With atmospheric solids analysis probe (ASAP), a jet of heated gas is directed at the sample surface and the desorbed species are ionized by corona discharge.[4] Glow dischargeThe direct analysis in real-time (DART) ion source uses a glow discharge to create the primary ions that are then directed against the sample surface.[5] Sonic sprayDesorption sonic spray ionization (DeSSI)[6] uses sonic spray ionization[7] to form the ions that are directed at the sample surface. Laser assistedElectrospray-assisted laser desorption/ionization (ELDI) relies on a laser to the desorption of material into the electrospray plume.[8] With matrix-assisted laser desorption electrospray ionization (MALDESI), a nitrogen laser is used to desorb material into the electrospray.[9] MALDESI has been used with MALDI matrix materials. Laser ablation electrospray ionization (LAESI) uses an infrared laser for ablation of the sample material.[10] Desorption atmospheric pressure photoionization (DAPPI) is not an electrospray technique, but uses a jet of heated solvent for desorption and ultraviolet light for photoionization.[11] References
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This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Desorption_electrospray_ionization". A list of authors is available in Wikipedia. |