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Quadrupole ion trap with switchable multipole fractions

a multi-pole fraction, quadruple ion technology, applied in the direction of mass spectrometers, separation processes, stability-of-path spectrometers, etc., can solve the problems of falling out of resonance, disadvantageous mass selective storage of ions, and superposed multi-pole fields, etc., to achieve good mass resolution and good mass resolution

Inactive Publication Date: 2000-10-10
BRUKER DALTONIK GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The ion trap according to the invention can be operated, on the one hand, with as ideal a quadrupole field as possible and, on the other, with defined superposed higher multipole fields. It is possible to switch over the various operating states quickly, without the stored ions being greatly disturbed

Problems solved by technology

As a result, on enlargement of their oscillation due to resonant energy absorption, ions quickly fall out of step with the exciting interference frequency, and thus fall out of resonance.
The superposed multipole fields are, however, disadvantageous for mass selective storage of ions in the ion trap.
The secular frequencies of the undesired ions are constantly excited, causing them soon to leave the ion trap.

Method used

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  • Quadrupole ion trap with switchable multipole fractions
  • Quadrupole ion trap with switchable multipole fractions
  • Quadrupole ion trap with switchable multipole fractions

Examples

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Embodiment Construction

Referring first to FIG. 1, a rotationally hyperbolic electrode structure comprises end caps and ring electrodes which are supported by insulating carriers (8). The upper end cap is divided into two component electrodes (1) and (2) and the lower end cap into component electrodes (6) and (7). The ring electrode is divided into component electrodes (3), (4), and (5). If component electrodes (1), (2), (6), and (7) are electroconductively connected, as well as component electrodes (3), (4), and (5), a relatively pure quadrupole field can be generated by applying a voltage between the two electrode groups. The potential profile of the quadrupole field is indicated with broken lines.

If, however, the component electrodes are electrically isolated and receive different voltages, the rotationally symmetric field in the interior can be changed relatively variably. In the mathematical and physical sense, a change of this kind always corresponds to superposition of the quadrupole field with mult...

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Abstract

An ion trap is provided in which higher multipole field fractions can be switched on and off and, in addition, can be electrically tuned. Specifically, the electrodes of an ideally shaped ion trap are divided into rotationally symmetrical component electrodes positioned facing the interior of the ion trap on a hyperboloidal surface with rotationally symmetry.

Description

FIELD OF THE INVENTIONThe invention relates to RF quadrupole ion traps.BACKGROUND OF THE INVENTIONThe various applications of RF quadrupole ion traps as single mass spectrometers, as tandem mass spectrometers for MS / MS examinations, as reaction vessels and measuring instruments for ionic molecule reactions, as a tool for the selective storage of ions with a uniform mass-to-charge ratio, and for the fragmentation of ions for examinations of their structure are known, for example from the standard work "Quadrupole Storage Mass Spectrometry" by R. E. March and R. J. Hughes, John Wiley & Sons, New York 1989.Superposition of the quadrupole field of an RF quadrupole ion trap with higher multipole fields can have a favourable or adverse effect on operation, depending on the operating mode and operating phase of the ion trap.Superposition of relatively weak, higher multipole fields of the same frequency on the RF quadrupole field has considerable effect on the stored ions if these ions stay...

Claims

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Application Information

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IPC IPC(8): H01J49/34H01J49/42
CPCH01J49/424
Inventor FRANZEN, JOCHENWANG, YANG
Owner BRUKER DALTONIK GMBH
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