Ion Trap Mass Spectrometer
AssigneeLeco Corporation
InventorAnatoly N. Verenchikov
Life of this patent
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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.
Claims19
1-157. (canceled)
An mass spectrometry apparatus, comprising:
- a chromatograph;
- a first mass spectrometer arranged downstream of said chromatograph;
- a fragmentation cell for fragmenting ions from said first mass spectrometer;
- a pulsed converter elongated in a linear or curved Z-direction;
- an electrostatic trap elongated in a linear or curved Z-direction comprising at least one of an image current detector and a time-of-flight detector.
A method of gain adjustment of an electrostatic trap operation, comprising:
- admitting a variable ion flux into an ion guide;
- measuring a momentary ion current from the ion guide into at least one converter;
- adjusting a duration of ion flow into the at least one converter in order to fill the at least one converter with a preset target number of charges;
- injecting ions from the at least one converter into at least one electrostatic trap;
- and
- adjusting a data acquisition time within the at least one electrostatic trap equal to the duration of ion flow.
175-182. (canceled)
Dependencies are inferred from the claim text.