US 12,512,311 B2 · Method for driving linear ion trap and mass spectrometer

Abstract

A method for driving a linear ion trap having rod electrodes arranged so as to surround a central axis includes: an ion-introducing step for introducing ions into an ion-capturing space surrounded by the rod electrodes, and for capturing the ions by a multipole RF electric field created within the ion-capturing space; and an ion-ejecting step for creating both a DC electric field for ion extraction extending from an external area outside the ion-capturing space into the ion-capturing space through a space between two predetermined rod electrodes neighboring each other around the central axis among the plurality of rod electrodes and the multipole RF electric field, and for sequentially ejecting ions according to their m/z from the ion-capturing space toward the external area through the space between the two predetermined rod electrodes by changing at least one of the multipole RF electric field and the DC electric field.

Claims11

Dependent claims

A method for driving a linear ion trap in which a plurality of rod electrodes are arranged so as to surround a central axis, the method comprising:

an ion-introducing step for introducing ions into an ion-capturing space surrounded by the plurality of rod electrodes, and for capturing the ions by a multipole RF electric field created within the ion-capturing space;
and
an ion-ejecting step for creating both a DC electric field for ion extraction which extends from an external area outside the ion-capturing space into the ion-capturing space through a space between two predetermined rod electrodes neighboring each other around the central axis among the plurality of rod electrodes and the multipole RF electric field, and for sequentially ejecting ions according to mass-to-charge ratios of the ions from the ion-capturing space toward the external area through the space between the two predetermined rod electrodes by changing at least one of the multipole RF electric field and the DC electric field.

A mass spectrometer, comprising:

a linear ion trap unit including a plurality of rod electrodes arranged so as to surround a central axis, and an extraction electrode located in an external area outside a space between two predetermined rod electrodes neighboring each other around the central axis among the plurality of rod electrodes;
an RF voltage generator configured to apply an RF voltage to each of the plurality of rod electrodes so as to create a multipole RF electric field within an ion-capturing space surrounded by the plurality of rod electrodes;
an extraction voltage generator configured to apply a DC voltage to the extraction electrode so that a DC electric field for ion extraction extends through the space between the two predetermined electrodes into the ion-capturing space;
and
a controller configured to control the RF voltage generator and the extraction voltage generator, so as to eject ions from the ion-capturing space through the space between the two predetermined rod electrodes according to mass-to-charge ratios of the ions by changing at least one of the RF voltage and the DC voltage while the ions are confined within the ion-capturing space.

2 more elements

Dependencies are inferred from the claim text.

Method for driving linear ion trap and mass spectrometer

Life of this patent

Method for driving linear ion trap and mass spectrometer

Life of this patent

Abstract

Claims11