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Mass-selective ion accumulation and fragmentation in a linear octopole ion trap external to a fourier transform ion cyclotron resonance mass spectrometer

โœ Scribed by Yang Wang; Stone D.-H. Shi; Christopher L. Hendrickson; Alan G. Marshall

Publisher
Elsevier Science
Year
2000
Tongue
English
Weight
171 KB
Volume
198
Category
Article
ISSN
1387-3806

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โœฆ Synopsis

Electrosprayed protein ions are accumulated and mass selected in an external linear octopole trap before injection into a Fourier transform ion cyclotron resonance (FTICR) mass spectrometer. Mass selection is performed by application of superimposed rf and dc octopole electric potentials during ion accumulation. Ion trajectory stability and mass selection in the octopole field are explained qualitatively by analogy to a quadrupole mass filter. Accumulation of ions from a selected m/z range is demonstrated experimentally for 7 and 9.4 T electrospray ionization (ESI) FTICR mass spectrometers. Ion fragmentation in the octopole may occur under certain operating conditions. (Int J Mass Spectrom 198 (2000) 113-120)

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