Miniature toroidal radio frequency ion trap mass analyzer
AssigneeBrigham Young University
InventorsStephen A. Lammert, Samuel E. Tolley, Jeffrey L. Jones, Randall W. Waite, Edgar D. Lee, Milton L. Lee
Life of this patent
Estimating the term…
Abstract
A scaled down version of a toroidal radio frequency (RF) ion trap mass analyzer operating with RF trapping voltages on the order of 1 kVp-p yet despite the reduced dimensions, retains roughly the same ion trapping volume as conventional 3D quadrupole ion traps, wherein the curved geometry enables construction of a compact mass analyzer and easy interface with conventional electron multipliers.
Claims41
A method for separating ions according to mass-to-charge ratios of charged particles and charged particles derived from atoms, molecules, particles, sub-atomic particles and ions, using a miniature toroidal radio frequency (RF) ion trap mass analyzer, said method comprising the steps of:
- 1) providing a trapping volume including a filament endcap, a detector endcap, an inner ring and an outer ring to thereby generate a quadrupolar trapping field for storing ions;
- and
- 2) disposing a plurality of slits and bridges in the filament and the detector endcaps, wherein the plurality of bridges are recessed below a surface of the filament and detector endcaps so as to minimize discontinuities in the quadrupolar trapping field
A method for separating ions according to mass-to-charge ratios of charged particles and charged particles derived from atoms, molecules, particles, sub-atomic particles and ions, using a miniature toroidal radio frequency (RF) ion trap mass analyzer, said method comprising the steps of:
- 1) providing a trapping volume including a filament endcap, a detector endcap, an inner ring and an outer ring to thereby generate a quadrupolar trapping field for storing ions;
- and
- 2) disposing a detector gate between the detector endcap and the detection means, wherein the detector gate controls a flow of ions from the trapping volume to the detection means to thereby prolong life, reduce latent noise, and improve the duty cycle of the detection means.
The method for separating ions according to mass-to-charge ratios of charged particles and charged particles derived from atoms, molecules, particles, sub-atomic particles and ions, using a miniature toroidal radio frequency ion trap mass analyzer, said method comprising the steps of:
- 1) providing a trapping volume including a filament endcap, a detector endcap, an inner ring and an outer ring to thereby generate a quadrupolar trapping field for storing ions;
- and
- 2) selecting a size for a radius of the trapping volume that will enhance ion optic coupling to an entrance cone of the detection means.
A method for separating ions according to mass-to-charge ratios of charged particles and charged particles derived from atoms, molecules, particles, sub-atomic particles and ions, using a miniature toroidal radio frequency ion trap mass analyzer, wherein a mass analyzer includes a trapping volume including filament endcap, a detector endcap, an inner ring and an outer ring to thereby generate a quadrupolar trapping field for storing ions, a detection means for detecting ions that are ejected from the trapping volume through the detector endcap, and an ion source for introducing ions into the trapping volume, said method comprising the new step of:
- 1) disposing a plurality of slits and bridges in the filament and the detector endcaps, wherein the plurality of bridges are recessed below a surface of the filament and detector endcaps so as to minimize discontinuities in the quadrupolar trapping field.
A method for separating ions according to mass-to-charge ratios of charged particles and charged particles derived from atoms, molecules, particles, sub-atomic particles and ions, using a miniature toroidal radio frequency ion trap mass analyzer, wherein a mass analyzer includes a trapping volume including filament endcap, a detector endcap, an inner ring and an outer ring to thereby generate a quadrupolar trapping field for storing ions, a detection means for detecting ions that are ejected from the trapping volume through the detector endcap, and an ion source for introducing ions into the trapping volume, said method comprising the new step of:
- 1) disposing a detector gate between the detector endcap and the detection means, wherein the detector gate controls a flow of ions from the trapping volume to the detection means to thereby prolong life, reduce latent noise, and improve the duty cycle of the detection means.
A method for separating ions according to mass-to-charge ratios of charged particles and charged particles derived from atoms, molecules, particles, sub-atomic particles and ions, using a miniature toroidal radio frequency ion trap mass analyzer, wherein a mass analyzer includes a trapping volume including filament endcap, a detector endcap, an inner ring and an outer ring to thereby generate a quadrupolar trapping field for storing ions, a detection means for detecting ions that are ejected from the trapping volume through the detector endcap, and an ion source for introducing ions into the trapping volume, said method comprising the new step of:
- 1) selecting a size for a radius of the toroidal trapping volume that will enhance ion optic coupling to an entrance cone of the detection means.
A system for separating ions according to mass-to-charge ratios of charged particles and charged particles derived from atoms, molecules, particles, sub-atomic particles and ions, using a miniature toroidal radio frequency ion trap mass analyzer, said system comprised of:
- a trapping volume including a filament endcap, a detector endcap, an inner ring and an outer ring to thereby generate a quadrupolar trapping field for storing ions;
- a detection means for detecting ions that are ejected from the trapping volume through the detector endcap;
- an ion source for introducing ions into the trapping volume through the filament endcap;
- and
- a plurality of slits and bridges in the filament and the detector endcaps, wherein the plurality of bridges are recessed below a surface of the filament and detector endcaps.
A system for separating ions according to mass-to-charge ratios of charged particles and charged particles derived from atoms, molecules, particles, sub-atomic particles and ions, using a miniature toroidal radio frequency ion trap mass analyzer, said system comprised of:
- a trapping volume including a filament endcap, a detector endcap, an inner ring and an outer ring to thereby generate a quadrupolar trapping field for storing ions;
- a detection means for detecting ions that are ejected from the trapping volume through the detector endcap;
- an ion source for introducing ions into the trapping volume through the filament endcap;
- and
- a detector gate between the detector endcap and the detection means.
A system for separating ions according to mass-to-charge ratios of charged particles and charged particles derived from atoms, molecules, particles, sub-atomic particles and ions, using a miniature toroidal radio frequency ion trap mass analyzer, wherein a mass analyzer includes a trapping volume including filament endcap, a detector endcap, an inner ring and an outer ring to thereby generate a quadrupolar trapping field for storing ions, a detection means for detecting ions that are ejected from the trapping volume through the detector endcap, and an ion source for introducing ions into the trapping volume, said system now including:
- a plurality of slits and bridges in the filament and the detector endcaps, wherein the plurality of bridges are recessed below a surface of the filament and detector endcaps so as to minimize discontinuities in the quadrupolar trapping field.
A system for separating ions according to mass-to-charge ratios of charged particles and charged particles derived from atoms, molecules, particles, sub-atomic particles and ions, using a miniature toroidal radio frequency ion trap mass analyzer, wherein a mass analyzer includes a trapping volume including filament endcap, a detector endcap, an inner ring and an outer ring to thereby generate a quadrupolar trapping field for storing ions, a detection means for detecting ions that are ejected from the trapping volume through the detector endcap, and an ion source for introducing ions into the trapping volume, said system now including:
- a detector gate between the detector endcap and the detection means.
A method for separating ions according to mass-to-charge ratios of charged particles and charged particles derived from atoms, molecules, particles, sub-atomic particles and ions, using a miniature toroidal radio frequency (RF) ion trap mass analyzer, said method comprising the steps of:
- 1) providing a trapping volume including a filament endcap, a detector endcap, an inner ring and an outer ring to thereby generate a quadrupolar trapping field for storing ions;
- and
- 2) wherein said mass analyzer is suitable for portable applications that require use of the mass analyzer outside of a desktop environment.
Dependencies are inferred from the claim text.