Tandem Mass Spectrometry OBI:0200198 MS/MS SCDO:0001138 A data transformation that uses two or more analyzers separated by a region in which ions can be induced to fragment by transfer of energy (frequently by collision with other molecules). Sufficient Tandem MS Example of usage: A precursor ion is selected in the first stage, allowed to fragment and then all resultant masses are scanned in the second mass analyzer and detected in the detector that is positioned after the second mass analyzer. This experiment is commonly performed to identify transitions used for quantification by tandem MS. Chemical Assay