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US 11,742,192 B2Granted
Electrostatic trap mass spectrometer with improved ion injection
AssigneeLeco Corporation
InventorAnatoly N. Verenchikov
Life of this patent
Estimating the term…
Abstract
A method of mass spectral analysis in an analytical electrostatic trap (14) is disclosed. The electrostatic trap (14) defines an electrostatic field volume and includes trap electrodes having static and non-ramped potentials. The method comprises injecting a continuous ion beam into the electrostatic field volume.
Claims15
A method of mass spectral analysis in an analytical electrostatic trap, comprising:
- forming an electrostatic trapping field having reflecting field regions comprising planar gridless ion mirrors spaced by a field-free region, each planar gridless ion mirror comprising at least four circular electrodes, wherein the field provides isochronous ion oscillations in the first X-direction and indefinite trapping of moving ions by spatial focusing in the second transverse Y-direction, and wherein the field is substantially extended in the third Z-direction;
- injecting a continuous ion beam into the trapping field at a small inclination angle with respect to the first X-direction for a period longer than at least 100 ion oscillations within said trap;
- effecting motion of trapped ions;
- detecting image current signal induced by the oscillating ions;
- and
- converting said signal into spectrum of oscillating frequencies with the subsequent conversion into (m/z) spectrum.
3 more elements
The method as in any preceding claim further comprising:
- multiplexing electrostatic field volumes;
- and
- distributing said continuous ion beam into said electrostatic field volumes for parallel and independent mass analysis from either single or multiple ion sources.
An electrostatic trap mass spectrometer comprising:
- an ion source to form a continuous ion beam;
- an electrostatic trap having ion reflecting regions comprising planar gridless ion mirrors spaced by a field-free region, each planar gridless ion mirror comprising at least four circular electrodes, wherein a shape and potentials of said electrostatic trap provide isochronous ion oscillations in a first X-direction and spatial ion confinement in the second Y-direction, and wherein the trap is substantially extended in the third Z-direction;
- injection optics for introducing the continuous ion beam into the electrostatic trap without ramping of electrostatic trap potentials;
- ion steering means for directing said ion beam within X-Y plane and at a small inclination angle with respect to the X-direction for the period of ion beam injection into said trap;
- means for effecting motion of at least a portion of trapped ions;
- a detector for measuring image current signal induced by moving ion clouds;
- and
- means for reconstructing mass spectra from detector signal waveforms.
5 more elements
Dependencies are inferred from the claim text.