Mass spectrometer and related ionizer and methods

A technology for ion generators and mass spectrometers, applied in chemical instruments and methods, mass spectrometers, separation methods, etc., can solve problems such as expensive, reduced filter quality, and poor performance

Inactive Publication Date: 2006-08-09
MONITOR INSTR
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This analyzer is commonly used in helium leak analyzers, such as sector field mass spectrometers, which are easy to manufacture but offer poor performance and are often relatively expensive
[0008] Quadrupole analyzers are smaller and less expensive than magnetic separators, but their filter quality degrades when approaching the lower end of the mass range

Method used

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  • Mass spectrometer and related ionizer and methods
  • Mass spectrometer and related ionizer and methods
  • Mass spectrometer and related ionizer and methods

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Embodiment Construction

[0037] In conventional mass spectrometers, such features as the use of "perfect" electric and magnetic fields, and linearity of the mass-to-charge ratio, and separation ranges, such as length and angle, are often emphasized. An advantageous feature of an additional embodiment is the ability to obtain useful and reliable information without requiring the best features described above, especially with respect to molecules of low mass, typically on the order of 20 amu, such as hydrogen and helium or divalent nitrogen.

[0038] The development of cross-field mass spectrometers is primarily driven by two classes of analytical problems, namely, the measurement of molecular identities with high molecular weights and relative isotopic abundances. Although these two problems arise from different applications in terms of physics, they can be considered equivalent. Instruments with high resolution required to solve these problems can be properly designed if equations of motion can be est...

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Abstract

In one embodiment, a miniaturized structure and associated method function as a mass spectrometer or analyzer and may, with modification, function as an ion generator. The miniaturized structure has a pair of generally planar parallel spaced electrodes which have projecting walls cooperating to define an ion generating chamber and an exit aperture. By controlling the electric field which is oriented perpendicular to an applied magnetic field, the ion beam may be separated into a plurality beams based upon mass to charge ratio with a predetermined mass to charge ratio emerging from the exit of the apparatus and when the apparatus is functioning as a mass spectrometer or analyzer impinges on an ion collector which responsively transmits information to a cooperating processor. Where it is desired to have it function as an ionizer the ion collector disposed adjacent the ion exit is eliminated.

Description

technical field [0001] The present invention relates to so-called cross-field mass spectrometers and ionizers, which separate ionized gas particles by movement in electric and magnetic fields perpendicular to each other according to their mass-to-charge ratio. Background technique [0002] The use of mass spectrometry to determine the identity and quantity of constituent materials in gaseous, liquid or solid samples has long been known. Combining such systems is known to analyze samples in a vacuum by converting molecules or atoms into ions, separating the ions by their mass-to-charge ratio, and allowing the ions to bombard a detector. See generally US Patent Nos. 2,882,410; 3,070,951; 3,590,243; and 4,298,795. See also US Patent Nos. 4,882,485 and 4,952,802. [0003] Generally, a mass spectrometer comprises an ionizer inlet assembly, in which a sample to be analyzed is received, a high vacuum chamber, which cooperates with the ionizer inlet, and an analyzer assembly, whic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D59/44B01D59/48H01J41/18H01J49/28
CPCH01J41/18B01D59/48H01J49/328
Inventor 冈特尔·F.·沃斯
Owner MONITOR INSTR
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