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Half protons or doubly charged protons? The history of metastable ions
作者姓名:Budzikiewicz H  Grigsby RD
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收稿时间:19 January 2004

Half protons or doubly charged protons? The history of metastable ions
Budzikiewicz H,Grigsby RD.Half protons or doubly charged protons? The history of metastable ions[J].Journal of The American Society for Mass Spectrometry,2004,15(9):1261-1265.
Authors:Email author" target="_blank">Herbert?BudzikiewiczEmail author  Ronald?D?Grigsby
Institution:1. Institut für Organische Chemie der Universität zu Köln, Cologne, Germany;2. PetroMass, Norman, Oklahoma, USA
Abstract:The history of metastable ions is intertwined with that of ions formed by collision-induced dissociation (CID), and frequently the genesis of the two ion types cannot be strictly separated. Originally, metastable ions were considered a curiosity or even a nuisance, being responsible for "humps" in the base line of the recorded mass spectra. In their heyday metastable ions were recognized as having importance for establishing fragmentation sequences and for distinguishing between isomeric ion structures. Today, in many respects the utility of metastable ions has been superseded by a systematic application of CID techniques; yet the evaluation of their shape is still of importance for questions of reaction energies and ion thermochemistry.
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