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US 8,796,615 B2Granted
Mass spectrometer
AssigneeMicromass UK Limited
InventorsMartin Raymond Green, Daniel James Kenny, David J. Langridge, Jason Lee Wildgoose
Life of this patent
Estimating the term…
Abstract
A mass spectrometer is disclosed comprising a quadrupole rod set ion trap wherein a potential field is created at the exit of the ion trap which decreases with increasing radius in one radial direction. Ions within the ion trap are mass selectively excited in a radial direction. Ions which have been excited in the radial direction experience a potential field which no longer confines the ions axially within the ion trap but which instead acts to extract the ions and hence causes the ions to be ejected axially from the ion trap.
Claims20
An ion trap comprising:
- a first electrode set comprising a first plurality of electrodes having a first longitudinal axis;
- a second electrode set comprising a second plurality of electrodes having a second longitudinal axis, said second electrode set being arranged downstream of said first electrode set;
- a first device arranged and adapted to apply one or more DC voltages to one or more of said first plurality of electrodes or to one or more of said second plurality of electrodes so as to create, in use, an electric potential within said first electrode set or within said second electrode set which increases or decreases or varies with radial displacement in a first radial direction as measured from a central longitudinal axis of said first electrode set or said second electrode set;
- a second device arranged and adapted to excite at least some ions within said first electrode set in at least one radial direction or to increase the radial displacement of at least some ions in at least one radial direction within said first electrode set;
- a first plurality of vane or secondary electrodes arranged between the electrodes of the first electrode set or a second plurality of vane or secondary electrodes arranged between the electrodes of the second electrode set;
- and
- a device arranged and adapted to apply one or more first DC voltages or one or more second DC voltages to at least some of said vane or secondary electrodes.
4 more elements
A method of trapping ions comprising:
- providing a first electrode set comprising a first plurality of electrodes having a first longitudinal axis;
- providing a second electrode set comprising a second plurality of electrodes having a second longitudinal axis, said second electrode set being arranged downstream of said first electrode set;
- applying one or more DC voltages to one or more of said first plurality of electrodes or to one or more of said second plurality of electrodes so as to create an electric potential within said first electrode set or within said second electrode set which increases or decreases or varies with radial displacement in a first radial direction as measured from a central longitudinal axis of said first electrode set or said second electrode set;
- exciting at least some ions within said first electrode set in at least one radial direction or increasing a radial displacement of at least some ions in at least one radial direction within said first electrode set;
- providing a first plurality of vane or secondary electrodes arranged between the electrodes of the first electrode set or a second plurality of vane or secondary electrodes arranged between the electrodes of the second electrode set;
- and
- applying one or more first DC voltages or one or more second DC voltages to at least some of said vane or secondary electrodes.
4 more elements
An ion trap comprising:
- a first electrode set comprising a first plurality of electrodes having a first longitudinal axis;
- a second electrode set comprising a second plurality of electrodes having a second longitudinal axis, said second electrode set being arranged downstream of said first electrode set;
- a first device arranged and adapted to apply one or more DC voltages to one or more of said second plurality of electrodes so as to create, in use, an electric potential within said first electrode set or within said second electrode set which increases or decreases or varies with radial displacement in a first radial direction as measured from a central longitudinal axis of said first electrode set or said second electrode set;
- and
- a second device arranged and adapted to excite at least some ions within said first electrode set in at least one radial direction or to increase a radial displacement of at least some ions in at least one radial direction within said first electrode set;
- wherein said first electrode set is axially segmented into a plurality of axial segments and wherein in a mode of operation at least some of said plurality of axial segments are maintained at different DC potentials or wherein one or more transient DC potentials or voltages or one or more transient DC potential or voltage waveforms are applied to at least some of said plurality of axial segments so that at least some ions are trapped in one or more axial DC potential wells or wherein at least some ions are urged in a first axial direction or a second opposite axial direction.
3 more elements
A method of trapping ions comprising:
- providing a first electrode set comprising a first plurality of electrodes having a first longitudinal axis;
- providing a second electrode set comprising a second plurality of electrodes having a second longitudinal axis, said second electrode set being arranged downstream of said first electrode set;
- applying one or more DC voltages to one or more of said second plurality of electrodes so as to create an electric potential within said first electrode set or within said second electrode set which increases or decreases or varies with radial displacement in a first radial direction as measured from a central longitudinal axis of said first electrode set or said second electrode set;
- and
- exciting at least some ions within said first electrode set in at least one radial direction or increasing a radial displacement of at least some ions in at least one radial direction within said first electrode set;
- wherein said first electrode set is axially segmented into a plurality of axial segments and wherein in a mode of operation at least some of said plurality of axial segments are maintained at different DC potentials or wherein one or more transient DC potentials or voltages or one or more transient DC potential or voltage waveforms are applied to at least some of said plurality of axial segments so that at least some ions are trapped in one or more axial DC potential wells or wherein at least some ions are urged in a first axial direction or a second opposite axial direction.
3 more elements
Dependencies are inferred from the claim text.