Patent · US Active

Ion ejection from a quadrupole ion trap

US9312114B2 · kind B2 · utility

4Cited by

10References

30Claims

0Family size

Assignee

THERMO FISHER SCIENTIFIC (BREMEN) GMBH · DE

Inventors

Christian Hock · Bremen, DE
Dmitry Grinfeld · Bremen, DE
Richard Heming · Bremen, DE

Key dates

Filing date	May 20, 2015
Grant date	Apr 12, 2016
Priority date	—
Expiry date	May 20, 2035

Classification

Technology area (CPC H)Electricity
CPC primaryH01J49/4245
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

A method of ejecting ions to be analyzed from a quadrupole ion trap in which a trapping field is created by one or more RF voltages applied to one or more electrodes of the trap, the method comprising the steps of cooling the ions to be analyzed within the quadrupole ion trap until the ions are thermalized, reducing the amplitude of one or more RF voltages applied to the quadrupole ion trap and applying the reduced amplitude RF voltages for one half cycle after the one or more RF voltages have reached a zero crossing point, turning off the RF voltages applied to the quadrupole ion trap, and ejecting the ions to be analyzed from the quadrupole ion trap.

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