Electrohydrodynamic ionization: Difference between revisions
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The process that produces charged droplets and ions from a liquid under vacuum with the application of an electric field. The process is equivalent to sub ambient pressure [[electrospray]] ionization. | |||
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#B.N. Colby, C.A. Evans, Anal. Chem. 45 (2002) 1884. | |||
#J. C. A. Evans, C.D. Hendricks, Rev. Sci. Instrum. 43 (1972) 1527. | |||
#D.S. Simons, B.N. Colby, J. C. A. Evans, Int. J. Mass Spectrom. Ion Phys. 15 (1974) 291. | |||
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A methodology by which ions in solution can be desorbed from a liquid meniscus directly into an evacuated chamber by application of a suitable electrical bias to a metal capillary in which the solution is contained. In contrast to ES, droplet spraying is avoided in EH MS applications (by using very low flow rates), since there is no mechanism (other than metastable or collision-induced dissociation) for solvent removal subsequent to ion desorption. This latter feature lends to EH the possibility for studying condensed-phase ion solvation less invasively than other MS methods. Flow rates are restricted by using small capillaries and/or viscous solvents. In applications as a source of heavy primary ions for SIMS, flow rates are increased and/or solution compositions are adjusted to promote emission of massive clusters. | A methodology by which ions in solution can be desorbed from a liquid meniscus directly into an evacuated chamber by application of a suitable electrical bias to a metal capillary in which the solution is contained. In contrast to ES, droplet spraying is avoided in EH MS applications (by using very low flow rates), since there is no mechanism (other than metastable or collision-induced dissociation) for solvent removal subsequent to ion desorption. This latter feature lends to EH the possibility for studying condensed-phase ion solvation less invasively than other MS methods. Flow rates are restricted by using small capillaries and/or viscous solvents. In applications as a source of heavy primary ions for SIMS, flow rates are increased and/or solution compositions are adjusted to promote emission of massive clusters. | ||
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| Electrohydrodynamic ionization |
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A methodology by which ions in solution can be desorbed from a liquid meniscus directly into an evacuated chamber by application of a suitable electrical bias to a metal capillary in which the solution is contained. In contrast to ES, droplet spraying is avoided in EH MS applications (by using very low flow rates), since there is no mechanism (other than metastable or collision-induced dissociation) for solvent removal subsequent to ion desorption. This latter feature lends to EH the possibility for studying condensed-phase ion solvation less invasively than other MS methods. Flow rates are restricted by using small capillaries and/or viscous solvents. In applications as a source of heavy primary ions for SIMS, flow rates are increased and/or solution compositions are adjusted to promote emission of massive clusters. |
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