Hydroxide and oxygen atom attachment to dichlorophthalic anhydride in negative chemical ionization and collisionally activated dissociation in an external source ion trap mass spectrometer

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Title:	Hydroxide and oxygen atom attachment to dichlorophthalic anhydride in negative chemical ionization and collisionally activated dissociation in an external source ion trap mass spectrometer
Authors:	吳慧芬;Wu, Hui-fen;Chen, Chien-hung
Contributors:	淡江大學化學學系
Keywords:	negative chemical ionization (NCI);ion trap mass spectrometer (ITMS);collisionally activated dissociation (CAD)
Date:	2002-08
Issue Date:	2009-12-01
Publisher:	IM Publications
Abstract:	This study reports the investigation of some unusual adduct ions of hydroxide and oxygen atoms in both negative-ion chemical ionization (NCI) and collisionally-activated dissociation (CAD) processes in an external-source ion trap mass spectrometer. The [M + OH]– and [M + OH – Cl]– adduct ions in the NCI spectrum of 4,5-dichlorophthalic anhydride are attributed to an ion/molecule reaction due to the presence of trace amounts of water. The formation of the unusual [M + O – Cl]– ions during CAD of the M– ions from 3,6- and 4,5-dichlorophthalic anhydride isomers is attributed to reactive collisions of the fragment ions with residual oxygen.
Relation:	European journal of mass spectrometry 8(4), pp.329-332
DOI:	10.1255/ejms.489
Appears in Collections:	[Graduate Institute & Department of Chemistry] Journal Article

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