EP3430640A1 - Method for the ionisation of gaseous samples by means of dielectric barrier discharge and for the subsequent analysis of the generated sample ions in an analysis device - Google Patents
Method for the ionisation of gaseous samples by means of dielectric barrier discharge and for the subsequent analysis of the generated sample ions in an analysis deviceInfo
- Publication number
- EP3430640A1 EP3430640A1 EP17710865.1A EP17710865A EP3430640A1 EP 3430640 A1 EP3430640 A1 EP 3430640A1 EP 17710865 A EP17710865 A EP 17710865A EP 3430640 A1 EP3430640 A1 EP 3430640A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- capillary
- voltage
- plasma
- voltage signal
- sample
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J49/00—Particle spectrometers or separator tubes
- H01J49/02—Details
- H01J49/10—Ion sources; Ion guns
- H01J49/16—Ion sources; Ion guns using surface ionisation, e.g. field-, thermionic- or photo-emission
- H01J49/168—Ion sources; Ion guns using surface ionisation, e.g. field-, thermionic- or photo-emission field ionisation, e.g. corona discharge
Definitions
- the invention relates to a method for the ionization of gaseous samples by means of dielectrically impeded discharge and for the subsequent analysis of the sample ions generated in an analyzer, in particular a mass spectrometer or an ion mobility spectrometer, wherein the sample ions are generated by a plasma which is caused by a dielectrically impeded discharge is, wherein the dielectrically impeded discharge is generated by a noble gas is supplied through a capillary of a dielectric material, wherein by means of two adjacent to the exit region of the capillary on the outside of the capillary arranged, electrically insulated electrodes applied an AC voltage and the gaseous sample the outlet region of the capillary is supplied.
- Such a method is known from DE 10 2006 050 136 AI of the applicant.
- This method is suitable for the ionization of gaseous samples, the sample ions being analyzed after ionization in an analyzer, namely an ion mobility spectrometer or a mass spectrometer.
- a noble gas is passed through a capillary made of a dielectric material, eg glass, wherein adjacent to the exit region of the capillary outside of the capillary at a distance of about 1 cm from each other two ring electrodes are arranged.
- a plasma is generated between the electrodes and a plasma at the outlet of the capillary.
- the gaseous sample For ionization of a gaseous sample, the gaseous sample from the outside into the outlet region of the capillary, d .h. into the plasma at the exit led and ionized there, the gaseous sample itself does not enter the capillary.
- the sample ions thus generated then pass into an ion mobility spectrometer or into a mass spectrometer and are analyzed there.
- dielectrically impeded discharges can be used in analytical chemistry for the soft ionization of organic molecules or for the detection of elements upon prior dissociation of organic molecules.
- a prescribed capillary discharge can be used.
- an alternating voltage in particular a square-wave voltage
- two independent plasmas separate from one another, which may possibly merge into one another, namely a first plasma at the outlet of the capillary, hereinafter referred to as plasma jet, and a second plasma between the electrodes, hereinafter referred to as electrode plasma.
- the plasma jet is suitable for ionizing the gaseous sample
- the electrode plasma leads to a dissociation of molecules with subsequent excitation of elements, ie. there is no soft ionization, but the gas molecules are dissociated. It would be desirable, however, if it were possible, without dissociation of the molecules, the gaseous sample through the capillary through the targeted supply to the plasma jet in order to ionize the amount of sample largely completely, which is not possible with a supply of the sample from the outside.
- the object of the invention is therefore to improve the ionization of gaseous samples by means of dielectrically impeded discharge.
- This object is achieved in a method of the type described in the present invention that as AC voltage an unbalanced square-wave voltage is applied, in which the cycle time of the active voltage signal is set much shorter than the clock period of the inactive voltage signal. It has been found that, when using such an unbalanced square-wave voltage, it is possible to completely suppress the formation of the plasma between the two electrodes, because the two plasmas are formed separately from each other in time, ie. first the plasma jet in the exit area of the capillary and only then the electrode plasma between the two electrodes. If the active voltage signal of the square wave voltage short getak tet according ⁇ , the second plasma between the two electrodes can not be formed.
- the Plasmajet only a single plasma is created, namely that at the outlet of Kapil ⁇ lare, so the Plasmajet.
- This makes it possible to supply a gaseous sample together with the noble gas through the capillary, so that it is ensured that the complete gaseous sample reaches the area of the plasma jet outside the capillary.
- the gas molecules are neither dissociated nor fragmented and reach completely into the plasma jet.
- the detection of the gas molecules can be increased by one or two orders of magnitude.
- the gaseous sample can also be conducted from the outside into the exit region of the capillary and thus into the plasma jet.
- the cycle time of the active voltage signal can be increased and selectively adjusted (duty cycle), whereby the degree of ionization can be set for different analyte classes, for very robust molecules, the ionization occurs under operation of the electrode plasma and for more easily dissociable molecules in avoidance or Suppression of the electrode plasma .
- the cycle time of the active voltage signal is between 2 and 15% of the period of the square-wave voltage.
- the frequency of the square-wave voltage is preferably 15 to 25 kHz.
- a square-wave voltage in the range of 2 to 4 kV, preferably from 2.5 to 3.5 kV is used.
- the dielectrically impeded discharge is, as is known, operated at ambient pressure.
- the gaseous sample is supplied through the capillary.
- the gaseous sample is passed without passage through the capillary from the outside into the outlet region of the capillary.
- Fig. 1 shows a schematic representation of a device with a capillary with two electrodes and two plasmas in operation
- FIG. 2 shows a plasmas of Figure 1 causing symmetric square wave signal and the associated current signal
- Fig. 3 shows the device with only one plasma at the exit area of the capillary
- FIG. 4 shows an asymmetrical one which only causes the plasma according to FIG. 3
- the generally designated 1 device for the ionization of gaseous samples by dielectrally impeded discharge has a capillary 2, which is shown only schematically and with its right end.
- This capillary 2 is made of a dielectric material, preferably glass, and has an inner diameter between 300 to 3000 ⁇ at a wall thickness of about 350 pm.
- In the front end region of this capillary 2 are axially spaced from each other two preferably annular electrodes 3, 4 ange ⁇ arranged, which surrounds the outside of the capillary 2 and thus are not in electrical contact with the Kapillarinneren due to the dielectric properties of the capillary 2.
- the distance between the electrodes 3, 4 is about 1 cm.
- the electrode 4 is slightly beab standet ⁇ from the exit end of the capillary 2a. 2 2 through the capillary 5 is an inert gas supplied ⁇ leads, preferably helium or argon, in the direction of an arrow.
- an inert gas supplied ⁇ leads preferably helium or argon, in the direction of an arrow.
- 4 is a square wave voltage of z. B. 3, 5 kV applied, namely in the embodiment with a frequency of 20 kHz (a period of 50 ps).
- the gaseous sample can also be supplied from the outside in the direction of the arrows 6 in FIG.
- the expression or size of the plasma P2 ie. to reduce the plasma P2 or even completely off or suppress by the clock period of the active voltage signal Umax between the minimum value according to Figure 4 and the maximum value according to Figure 2 is adjusted (duty cycle).
- the device 1 is in a conventional manner before entering a Massenspektr- ter, which is not shown, ie before the trap of the mass spectrometer, ⁇ arranged. This is located in the sense of Figures 1 and 3 right next to the top of the Plasmajets PI. Alternatively, the device 1 may also be arranged prior to entry into an ion mobility spectrometer.
- the invention is not limited to the illustrated embodiment. Further embodiments are possible without departing from the basic idea.
- the gaseous sample can be passed without passing through the capillary 2 in the Plasmajet PI when the electrode plasma P2 is suppressed.
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Other Investigation Or Analysis Of Materials By Electrical Means (AREA)
- Electron Tubes For Measurement (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102016104852.6A DE102016104852B4 (en) | 2016-03-16 | 2016-03-16 | Method for ionizing gaseous samples by means of dielectrically impeded discharge and for subsequent analysis of the generated sample ions in an analyzer |
PCT/EP2017/055857 WO2017157858A1 (en) | 2016-03-16 | 2017-03-13 | Method for the ionisation of gaseous samples by means of dielectric barrier discharge and for the subsequent analysis of the generated sample ions in an analysis device |
Publications (1)
Publication Number | Publication Date |
---|---|
EP3430640A1 true EP3430640A1 (en) | 2019-01-23 |
Family
ID=58314184
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP17710865.1A Withdrawn EP3430640A1 (en) | 2016-03-16 | 2017-03-13 | Method for the ionisation of gaseous samples by means of dielectric barrier discharge and for the subsequent analysis of the generated sample ions in an analysis device |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP3430640A1 (en) |
DE (1) | DE102016104852B4 (en) |
WO (1) | WO2017157858A1 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN109682906B (en) * | 2019-01-10 | 2023-12-12 | 宁波大学 | Gas chromatography-low temperature plasma ion source mass spectrometer combined device |
CN112098395B (en) * | 2020-08-06 | 2021-10-01 | 北京航空航天大学 | Dielectric barrier discharge plasma emission spectrometer based on online detection |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AU2003266866A1 (en) * | 2002-09-19 | 2004-04-08 | Vlaamse Instelling Voor Technologisch Onderzoek (Vito) | Method and apparatus for generating and maintaining a plasma |
DE102006050136B4 (en) | 2006-10-25 | 2016-12-15 | Leibniz-Institut für Analytische Wissenschaften-ISAS-e.V. | Method and device for generating positive and / or negative ionized gas analytes for gas analysis |
US8421470B2 (en) * | 2008-03-25 | 2013-04-16 | Osaka University | Discharge ionization current detector |
US9390900B2 (en) * | 2010-01-25 | 2016-07-12 | Hitachi High-Technologies Corporation | Mass spectrometer |
GB2505685B (en) * | 2012-09-07 | 2015-11-04 | Univ Salford | Method of coating and etching |
-
2016
- 2016-03-16 DE DE102016104852.6A patent/DE102016104852B4/en not_active Expired - Fee Related
-
2017
- 2017-03-13 WO PCT/EP2017/055857 patent/WO2017157858A1/en active Application Filing
- 2017-03-13 EP EP17710865.1A patent/EP3430640A1/en not_active Withdrawn
Also Published As
Publication number | Publication date |
---|---|
DE102016104852B4 (en) | 2017-11-09 |
WO2017157858A1 (en) | 2017-09-21 |
DE102016104852A1 (en) | 2017-09-21 |
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