| abstract |
Mass spectrometer with: an ion source (1); a collision cell (4) for fragmenting ions, wherein in a first mode ions in the collision cell (4) are fragmented and in a second mode ions are substantially not fragmented; a mass analyzer; and a control system for automatically switching between the two modes at least once every 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0, 9, 1, 2, 3, 4, 5, 6, 7, 8, 9 or 10 seconds. |