postsource decay

postsource decay

A type of ion dissociation that occurs within the drift region of a time-of-flight (TOF) mass analyser. After initial ion formation and acceleration out of the source and into the flight tube, ions may dissociate or neutralise. In a linear TOF instrument, fragment ions and neutral species reach the detector at the same time as the precursor ions from which they are formed. These reactions can be specifically studied using a reflectron by stepwise adjustment of the ratio of accelerating to reflectron voltages, so as to bring fragment ions formed in postsource decay processes into focus at the detector.
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1467-Da candidate mass peak, we performed postsource decay analysis in reflector mode with an accelerating voltage of 20 kV and a delayed extraction of 110 ns.
Postsource decay analysis allowed identification of this peak as part of the N-terminal fragment of fibrinogen [alpha].
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