Patent · US Active

Ion ejection from a quadrupole ion trap

US9548195B2 · kind B2 · utility

3Cited by

11References

25Claims

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	Apr 7, 2016
Grant date	Jan 17, 2017
Priority date	—
Expiry date	Apr 7, 2036

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.