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Ion mobility spectrometer comprising a corona discharge ionization element

A technology of ion mobility and spectrometer, applied in the direction of electrical components, discharge tubes, instruments, etc., can solve problems such as quantitative analysis that is not suitable for multi-component types

Inactive Publication Date: 2007-04-18
SAES GETTERS SPA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The consequence is that state-of-the-art IMS instruments equipped with corona discharge are not suitable for quantitative analysis especially of the multi-component type

Method used

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  • Ion mobility spectrometer comprising a corona discharge ionization element
  • Ion mobility spectrometer comprising a corona discharge ionization element
  • Ion mobility spectrometer comprising a corona discharge ionization element

Examples

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example 1

[0035] Perform the analysis of a helium sample with the following nominal impurity composition (starting with a mixing cylinder supplied by the company SIAD in Bergamo, Italy): 1 ± 0.1 ppb of water, 1 ± 0.1 ppb of oxygen, 1 ± 0.1 ppb of hydrogen, 1 ± 0.1 ppb of hydrogen, 1 ± 0.1 ppb of 0.1 ppb carbon monoxide, 1 ± 0.1 ppb carbon dioxide, and 1 ± 0.1 methane, using argon as auxiliary gas.

[0036] These concentrations were obtained starting with a certified cylinder containing approximately 5 ppm of total impurities diluted with ultrapure helium through a calibrated orifice provided by SIAD.

[0037] The IMS spectrometer is equipped with a corona discharge ionization element IM of the type illustrated in FIG. 3 . In the element, the distance between the tip of electrode 304 and electrode 302' is 2.5 mm; parts 302 and 302' are bonded with a grid so that the total size of the opening between chamber 303 and chamber 308 is equal to 40 mm 2 , while opening 311 has a 90mm 2 total ...

example 2

[0038] Example 2 (comparison)

[0039] The experiment of sample 1 was repeated, keeping all conditions constant, except using a radioactive source with 10 mCi activity placed in chamber 303 63 Ni obtains ionization of the assist gas without supplying electricity beyond the electrodes 304 and 302'. The resulting spectrum obtained is reported in Figure 4 as curve 2 (the thinner curve in the figure).

[0040] From an examination of the two curves in Figure 4 it can be seen that the use of the corona discharge ionization source of the present invention allows the reproduction of 63 Ni source spectra obtained with additional samples of the same gas (the minimal difference between the two spectra is due to slight fluctuations in the composition of the samples in two successive experiments), thus allowing the implementation of multi-component analysis, but there are no issues associated with using the latter.

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Abstract

An ion mobility spectrometer is disclosed wherein the ionization element is a corona discharge source (300) consisting of a first chamber (308) provided with an inlet (309) for a gas to be analyzed and with at least one first opening (311) for communication between the internal space of the first chamber and the reaction zone of the spectrometer; a second chamber (303), contained in the first chamber, provided with an inlet (306) for an ultra-pu re gas or a mixture of ultra-pure gases, and with at least one second communication opening (310, 310') between the first and the second chamber; a pair of electrodes (304, 302'), at least one of which (304) is needle-shaped , arranged in the second chamber, with the pair of electrodes and the second opening arranged in such geometrical relationships that there is no optical path between the zone of the corona discharge and the ion detector of the IMS instrument. The instrument of the invention allows to reproduce the results of a spectrometer equipped with a 63Ni ionization source, while avoiding the problems connected to the transportation and use of radioactive material.

Description

technical field [0001] The present invention relates to ion mobility spectrometers comprising corona discharge ionization elements. Background technique [0002] The acronym IMS for Ion Mobility Spectroscopy is known in the art (the same acronym is also used for the instrument implementing the technique, in this case denoting "Ion Mobility Spectrometer"). The sample analyzed by IMS is usually a carrier gas including the gas or vapor to be analyzed: by operating under appropriate conditions, the picogram level (pg, ie 10 -12 gram), or the order of parts per trillion (ppt, equivalent to every 10 12 concentration of one analyte molecule in sample gas molecules). IMS technology is often used for the qualitative analysis of substances such as explosives or drugs, eg in airports, because of its rapid detection of these substances. Among the features that make the technique particularly useful for these purposes are its very high sensitivity, the speed with which results are obt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/64G01N27/68
CPCH01J49/168G01N27/68G01N27/622G01N27/64
Inventor 罗伯特·杰安南托尼奥卢卡·毛瑞马尔科·厄巴奴安东尼奥·伯纳希
Owner SAES GETTERS SPA
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