Measurement of light fragment ions with ion traps

Details Measurement of light fragment ions with ion traps Measurement of light fragment ions with ion traps

2006-05-26

2009-11-10

Vanore, David A (Department: 2881)

Radiant energy

Ionic separation or analysis

Methods

C250S281000, C250S290000, C250S291000, C250S292000, C250S293000

Reexamination Certificate

active

07615742

ABSTRACT:
The invention relates to methods for the measurement of fragment ion spectra in ion trap mass spectrometers in which fragment ions below a cut-off mass cannot normally be measured. The invention consists in measuring mass spectra including light fragment ions by briefly conducting the collisionally induced fragmentation—which is always brought about by a large number of collisions—at an unusual high RF storage voltage, which produces collisions more energetically than by conventional fragmentation, and then switching the RF voltage to a low RF voltage in a fast but controlled procedure. In this way light fragment ions are produced by double cleavages from metastable fragment ions with a certain half-life time. Since the cut-off mass for the storage capability is proportional to the RF storage voltage, reducing the RF storage voltage means that the light fragment ions can also be kept and measured in the ion trap.

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