Patent · US Active

Electrostatic trap

US8198581B2 · kind B2 · utility

4Cited by

2References

9Claims

0Family size

Assignee

THERMO FINNIGAN LLC · US

Inventors

Alexander A. Makarov · Bremen, DE
Eduard V. Denisov · Bremen, DE
Gerhard Jung · Delmenhorst, DE
Wilko Balschun · Bremen, DE
Stevan R. Horning · Delmenhorst, DE

Key dates

Filing date	Mar 29, 2010
Grant date	Jun 12, 2012
Priority date	—
Expiry date	Sep 16, 2030

Classification

Technology area (CPC H)Electricity
CPC primaryH01J49/425
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

An electrostatic trap such as an orbitrap is disclosed, with an electrode structure. An electrostatic trapping field of the form U′(r, φ, z) is generated to trap ions within the trap so that they undergo isochronous oscillations. The trapping field U′(r, φ, z) is the result of a perturbation W to an ideal field U(r, φ, z) which, for example, is hyperlogarithmic in the case of an orbitrap. The perturbation W may be introduced in various ways, such as by distorting the geometry of the trap so that it no longer follows an equipotential of the ideal field U(r, φ, z), or by adding a distortion field (either electric or magnetic). The magnitude of the perturbation is such that at least some of the trapped ions have an absolute phase spread of more than zero but less than 2 Π radians over an ion detection period Tm.

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