Patent · US Expired

Fragmentation in quadrupole ion trap mass spectrometers

US6410913B1 · kind B1 · utility

20Cited by

16References

13Claims

0Family size

Assignee

Bruker Daltonik GmbH · DE

Inventors

Andreas Brekenfeld · Bremen, DE
Michael Schubert · Parkton, US
Jochen Franzen · Bremen, DE

Key dates

Filing date	Jul 11, 2000
Grant date	Jun 25, 2002
Priority date	—
Expiry date	Jul 11, 2020

Classification

Technology area (CPC H)Electricity
CPC primaryH01J49/424
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

The invention relates to the fragmentation of ions in ion traps filled with collision gas by exciting their axial oscillations in a dipole-shaped excitation field with a frequency mixture which covers the frequency of ion oscillations. The invention consists of ramping up the voltages of the frequency mixture for the dipolar excitation field, as a result of which, surprisingly, approximately the same fragmentation results are obtained for ions of different structures in the same fragmentation times as at a structurally specific optimal voltage applied at a constant level.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.