Ion trap mass spectrometer
AssigneeLeco Corporation
InventorAnatoly N. Verenchikov
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Abstract
An apparatus 41 and operation method are provided for an electrostatic trap mass spectrometer with measuring frequency of multiple isochronous ionic oscillations. For improving throughput and space charge capacity, the trap is substantially extended in one Z-direction forming a reproduced two-dimensional field. Multiple geometries are provided for trap Z-extension. The throughput of the analysis is improved by multiplexing electrostatic traps. The frequency analysis is accelerated by the shortening of ion packets and either by Wavelet-fit analysis of the image current signal or by using a time-of-flight detector for sampling a small portion of ions per oscillation. Multiple pulsed converters are suggested for optimal ion injection into electrostatic traps.
Claims9
An ion trap mass spectrometer comprising:
- an ion source;
- a pulsed converter elongated along a Z-direction;
- an electrostatic trap analyzer comprising two sets of electrodes spaced by a field-free region, said electrodes;
- and
- an image current detector system,
- wherein said pulsed converter accumulates ions from said ion source and periodically injects said ions into said electrostatic trap analyzer, and said electrodes are arranged to trap ions within said electrostatic trap analyzer and to maintain said ions in an isochronous motion along an X-axis of said electrostatic trap analyzer, and
- wherein said image current detector system comprises:
- at least one detection electrode, with said ions in isochronous motion inducing an image current signal on the at least one detection electrode;
- a differential signal amplifier picking the signal between the at least one detection electrode and surrounding electrodes or ground;
- and
- an analog-to-digital converter arranged to record the image current signal induced on the at least one detection electrode.
Dependencies are inferred from the claim text.