Repeatedly scans a determined mass range e.g. 50-500
Set scan time e.g. 1 scan/s – limited by instrument.
Advantage - Looks for all ions in the range all the time. Full mass spectrum for identification/library searching
Disadvantage – low ion counts for key ions of eluting compounds
To increase time spent on each mass - decrease mass range scan or increase scan time
But if scan time too slow may miss compounds as need 5 scans per peak (each scan is a data point in the chromatogram) or may not count all important
GC-MS chromatogram is
1. all ions in every mass spectrum added together (total ion count) (TIC)
2. specific ion(s) extracted (EIC) from the Full Scan data
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