Ion trap mass spectrometer

Abstract

The application relates to an ion trap mass spectrometer. 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.

Description

technical field [0001] The present invention relates generally to the field of time-of-flight mass spectrometers and electrostatic traps for capturing and analyzing charged particles, and more particularly to electrostatic trap mass spectrometers with image detection and Fourier analysis and methods of use. Background technique [0002] Electrostatic trap (E-trap) mass spectrometers (MS) and multiple time-of-flight (MP-TOF) mass spectrometers both share a common feature - the analyzer electrostatic field is designed to be small initial Energy spread, angular spread and spatial spread provide isochronous ion motion. The two techniques differ in the arrangement of ion motion and the method of ion m / z measurement. In MP-TOF MS, ion packets follow a predetermined folded ion path from a pulsed source to a detector, and the ion mass-to-charge ratio (m / z) is determined from the ion time-of-flight (T), where T~(m / z) 0.5 . In E-trap MS, ions are trapped indefinitely, and ion fligh...

AI Technical Summary

Problems solved by technology

The combination of slow acquisition speed and limited charge capacity limits the duty cycle to 0.3% in most adverse cases

[0009] Thus, prior art MP-TOFs and E-traps limit mass analyzer throughput (i.e., combination of acquisition speed and charge capacity) to below 1E+6 to 1E+ 7 ions, which limits the effective duty cycle to less than 1%

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