We created a web-based tutorial designed to teach manual interpretation and identification of spectra acquired using Electron Transfer Dissociation (ETD). The tutorial provides an explanation of the ETD fragmentation process with the goal of identifying all of the significant peaks in a spectrum. We discuss determination of the precursor mass and charge state, neutral losses, electron transfer without dissociation, and the mechanisms by which fragment ions are created. Our hope is to provide a tool that presents the information already taught in DFH’s short courses in a way that is easy for any student or researcher in the mass spectrometry community to access. The tutorial may be found at .
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