Mass spectrometer

A mass spectrometer, quality technology, applied in the field of mass spectrometer, can solve the problem of expensive instruments

Inactive Publication Date: 2004-06-23
THE UNIV OF SYDNEY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, FTMS instruments are very expensive

Method used

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Embodiment Construction

[0039] Mass spectrometer 10 according to an embodiment of the present invention (see figure 1 ) comprises a pair of parallel spaced reflector electrodes 12,14 between which is an electron generating means in the form of an electron emitting electrode 16 parallel to the reflector electrodes 12,14. A detector in the form of a channel multiplier ion detector 18 is located behind the electrode 12 . The three electrodes 12 , 14 , 16 and the detector 18 are located within the vacuum chamber 20 . The mass spectrometer 10 also includes a sample injector 22 in the form of a pulse valve or nozzle to which sample molecules are supplied from a sample source 24 as is known in the art. The path of the sample molecule is given by figure 1 Arrow 26 in indicates. Mass spectrometer 10 also includes means in the form of a pulsed laser 28 for ionizing molecules when they are introduced between reflector electrode 12 and electron emission electrode 16 by pulsed sample injector 22 . Pulsed lase...

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Abstract

A new mass spectrometer (10) is described in which sample molecules (26) are ionized and caused to oscillate to and fro by reflecting electric fields established between two electrodes (12, 14) in a vacuum chamber (20). A mesh electron producing electrode (16) is located between reflector electodes (12, 14) and produces electrons by secondary emission on each pass of the oscillating ions when some of those ions strike the mesh. The secondary eldctrons are detected (18) after passage through reflector electrode (12), which is alos a mesh. The frequency of oscillation of the ions depends upon their mass and from the frequency distribution of the signals from each electron production event it is possible to identify the ions of different masses. The invention allows for a much more compact spectrometer instrument compared to a Time of flight Mass Spectrometer which is less expensive than a Fourier Transform Mass emplying ion-cyclotron resonance.

Description

technical field [0001] The present invention relates to mass spectrometers and methods for use in mass spectrometers. Background of the invention [0002] Mass spectrometry is a relatively simple spectroscopic concept in which the molecules of a sample are ionized and the ions are subsequently separated and subsequently detected in a mass analyzer according to their mass-to-charge ratio. Many types of mass spectrometers are available, such as magnetic field, electromagnetic field, quadrupole, ion cyclotron resonance, quadrupole ion storage trap, and time-of-flight analyzers. Among them, time-of-flight mass spectrometers (TOFMS) offer high sensitivity and can measure an extended (practically infinite) mass range. Therefore, it is theoretically suitable for the analysis of biological and synthetic polymers. Another advantage of TOFMS over other mass analysis methods is that a complete mass spectrum can be obtained from each ionization result. However, TOFMS instruments are ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/64H01J49/36G01N27/62H01J49/38H01J49/42
CPCH01J49/36
Inventor M·B·A·韦斯特F·张O·沃塔瓦S·H·凯布尔
Owner THE UNIV OF SYDNEY
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