US3633027A - Mass spectrometer connected to a gap chromatograph through a valved molecule separator - Google Patents

Mass spectrometer connected to a gap chromatograph through a valved molecule separator Download PDF

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US3633027A
US3633027A US3633027DA US3633027A US 3633027 A US3633027 A US 3633027A US 3633027D A US3633027D A US 3633027DA US 3633027 A US3633027 A US 3633027A
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separator
nozzle
gas
stage
source
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Erik Ragnar Ryhage
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Lkb-Produkter AB
LKB PRODUKTER
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N30/00Investigating or analysing materials by separation into components using adsorption, absorption or similar phenomena or using ion-exchange, e.g. chromatography or field flow fractionation
    • G01N30/02Column chromatography
    • G01N30/62Detectors specially adapted therefor
    • G01N30/72Mass spectrometers
    • G01N30/7293Velocity or momentum separators
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01JELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J49/00Particle spectrometers or separator tubes
    • H01J49/02Details
    • H01J49/04Arrangements for introducing or extracting samples to be analysed, e.g. vacuum locks; Arrangements for external adjustment of electron- or ion-optical components
    • H01J49/0422Arrangements for introducing or extracting samples to be analysed, e.g. vacuum locks; Arrangements for external adjustment of electron- or ion-optical components for gaseous samples

Abstract

An instrument for analyzing organic chemical compounds is provided. The instrument comprises a gas chromatograph which via a molecule separator is connected to the ion source of a mass spectrometer. The separator consists of a number of series connected evacuating stages, each stage being connected to a vacuum pump. Each stage is provided with an input jet nozzle and a coaxial output nozzle, a slide being insertable between these nozzles in the first stage so as to make it possible to switch off the flow through the separator.

Description

United States Patent Inventor Erllr Ragnar Ryhage Stockholm, Sweden App]. No. 23,715 Filed Mar. 30, 1970 Patented Jan. 4, 1972 Assignee LKB-Produkter All Bronma, Sweden Priority Apr. 21, 1969 Sweden 5621/69 MASS SPECTROMETER CONNECTED TO A GAP CHROMATOGRAPH THROUGH A VALVED MOLECULE SEPARATOR 3 Claims, 2 Drawing Figs.

US. Cl

Int. Cl

Field of Search ..H0lj 39/34,

GASCHROMATO GRAPH [56] References Cited UNITED STATES PATENTS 3,471,692 10/ l 969 Llewellyn Q. 250/419 G 3,080,754 3/1963 Johnson 250/419 G FOREIGN PATENTS 221,621 7/1968 Sweden 250/419 G Primary ExaminerJames W. Lawrence Assistant Examiner-C. E. Church Attorney-Christen & Sabol AISTRAC'I: An instrument for analyzing organic chemical compounds is provided. The instrument comprises a gas chromatograph which via a molecule separator is connected to the ion source of a mass spectrometer. The separator consists of a number of series connected evacuating stages, each stage being connected to a vacuum pump. Each stage is provided with an input jet nozzle and a coaxial output nozzle, a slide being insertable between these nozzles in the first stage so as to make it possible to switch off the flow through the separator.

MASSPECTRO PATENIEDJAN 4m 31631027 SHEEI 1- 0F 2 MASSPECTRO METER GASCHROMATO GRAPH MASS SPECTROMETER CONNECTED TO A GAP CHROMATOGRAPH THROUGH A VALVED MOLECULE SEPARATOR The present invention relates to an instrument for analyzing organic chemical compounds, the instrument comprising a gas chromatograph, a molecule separator and a mass spectrometer, the molecule separator being connected between the output of the gas chromatograph and the input of the ion source of the mass spectrometer, the separator including at least one separating stage consisting of an evacuation chamber connected to a vacuum pump, a jet input nozzle via which molecules in gas phase are supplied from the gas chromatograph and an output nozzle coaxial with the jet nozzle.

In a combination instrument as defined above, so called molecule separators are used for separating a carrier gas, usually helium, from the specimen to be analyzed and for reducing the pressure in the ion source of the mass spectrometer.

Different kinds of separators are used for this purpose, the so called Becker-Ryhage-Separator however having several advantages in comparison to the others. In this separator the enrichment is high, the loss of specimen is small, the dead volume is small and the memory effect is negligible. The Becker-Ryhage-Separator is generally made in two stages. In the first stage the pressure is reduced to 0.001 mm. Hg by an oil diffusion pump. In this way approximately 99 percent of the carrier gas is evacuated while at least 75 percent of the specimen remains. The pressure will then be further reduced at the ion source of the mass spectrometer.

The above described separator is described in detail by the inventor for instance in Analytical Chemistry vol. 36., No 4, Apr. I964 pages 759-764. The principle of the separator is described in the German Pat. No. 105 2,955 (See FIG. 1).

By using a conventional molecule separator several problems do however arise. For changing the gas chromatograph column the following steps have to be performed: (a) The connection between the separator and the ion source of the mass spectrometer has to be switched off or otherwise the current to the filament of the ion source has to be switched off. It is however not desirable to change the ionization conditions and thus a tap is generally mounted between the separator and the ion source; (b) The oil diffusion pump connected to the second separator stage is switched off; (c) The mechanical vacuum pump connected to the first separator stage is switched off; (d) The pressure in the separator is raised by means of a blow cock connected between the mechanical vacuum pump and the first separator stage; (e) Then the gas chromatograph column is exchanged; (f) The system is evacuated by connecting first the mechanical vacuum pump and then the oil diffusion pump; (g) When the pressure has been reduced sufficiently the tap of the ion source is opened. The above described procedure is very lengthy, especially the evacuation. The insertion of a tap between the separator and the ion source does further imply and increase of the dead volume of the system which in turn affects the separation obtained in the gas chromatograph. Furthermore the separator and the connection to the ion source has to be heated and it is of course desirable that the heated part is as small as possible. Although the pressure after the separator is very low and the velocity of the molecules is I high a certain risk for degradation in the tap and the connecting pipes arises because of thermic and catalytic effects.

The above discussed drawbacks can be avoided by using an instrument designed in accordance with the present invention, the essential features of which are defined in the attached claims.

The invention will now be described in detail with reference to the enclosed drawings in which:

FIG. 1 shows a two-stage separator according to the invention provided with a switching-off arrangement in the form of a slide;

FIG. 2 shows another embodiment of a two-stage separator according to the invention in which the second separator stage has been combined with the ion source.

In FIG. 1 reference 1 denotes a mounting flange for connection of a gas chromatograph G, reference 2 denotes the first separator stage, reference 3 denotes the second separator stage and reference 4 denotes the mounting flange oflthe ion source of the mass spectrometer M. The input jet nozzle of the separator stages are denoted 5a and 5b respectively and the output nozzles are denoted 6a and 6!: respectively. Reference 7 denotes the slide by means of which the gas flow can be switched off or at least be prevented from passing into the second separator stage. Reference 8 denotes a bellows which controls the position of the slide 7 and reference 9 denotes a knob for moving the bellows. The slide can be set into two positions and 11b, which positions are adjusted by means of a screw 10. References 12 and 13 denote connections leading to a mechanical vacuum pump and an oil diffusion pump respectively.

When the column of the gas chromatograph should be changed or if it for some other reason is desirable to switch off the gas flow through the separator, the slide 7 is inserted between the nozzles 5a and 6a. The distance between these nozzles these about 0.1 mm. and thus the slide should have this dimension. The nozzle 5a does also have a diameter of about 0.1 mm. The slide does not necessarily have to seal this nozzle completely but a small leakage :into the separator housing can be permitted. It has turned out in practice that in spite of this leakage the mechanical vacuum pump provides a pressure which is sufficiently low for making the oil diffusion pump work and for not making it necessary to have the ion source switched off. Even if the pressure in the first separator stage 2 is as much as 1 mm. Hg, instead of the normal value 0.01 mm. Hg, the system works satisfactory. Thus the pumps do not have to be switched off.

As it is sometimes desirable to have a certain leakage into the separator without having any gas flow into the ion source, the slide 7 can be shaped so as to seal only the output nozzle 6a. In this case the slide 7 could be provided with a slot in the surface turned to the input nozzle 5a. This shaping of the slide is suitable when a gas flow through only the gas chromatograph column is wanted, for instance after mounting the column.

In the arrangement according to the present invention the dead volume after the separator is reduced considerably. In the previously used systems the volume of the tap between the separator and the ion source is approximately 0.5 ml. and the connecting pipes have a volume of approximately the same size. If these values are compared with the area of the channel through the separator (0.8 mm?) and the area of the nozzle (0.008 mm?) the significanceof the reduced dead volume is understood. Of course a reduced volume after the separator means less than a reduced volume before the separator, the pressure conditions being completely different, but a reduced volume is still desirable. The insertion of some sort of tap before the separator is not suitable as this will increase the dead volume. Each person skilled within this field is aware of the drawbacks of such an arrangement, especially when capillary columns are used in the gas chromatograph.

A tap mounted before the separator further makes it more difficult to remove the flange for cleaning the nozzle 5a. The other nozzles do not have to be cleaned so often as the pressure and thus the fouling is less at these nozzles.

In the above described embodiment of the invention the switching ofi' means consist of a slide. The slide can of course be shaped in different ways and the insertion of the slide between the nozzles of the separator can be arranged in dif ferent ways. If only a sealing of the output nozzle is wanted it might thus be suitable to make the top of the output nozzle radially movable.

In FIG. 2 a new way of connecting the separator to a mass spectrometer is shown. This connection is made possible by using the present invention. In this figure the references denote the same members as in FIG. 1, the difference being that reference 15 denotes the connection leading to the ion source and references 14a and Nb denote the nozzle of the second separator stage. Reference 16 denotes the connection of the high vacuum system which in this case is the same for the second separator stage and the ion source housing. in this embodiment the dead volume is considerably decreased in comparison with the embodiment of FIG. 1. On the other hand the flexibility will be somewhat reduced.

We claim:

1. An instrument for analyzing organic-chemical compounds, the instrument comprising a gas chromatograph, a molecule separator and a mass spectrometer having a housing, the molecule separator being connected between the output of the gas chromatograph and the input of the ion source of the mass spectrometer, the molecule separator including at least one separating stage consisting of an evacuation chamber connected to a vacuum pump, a jet input nozzle from which molecules in gas phase are supplied from the gas chromatograph and an output nozzle coaxial with the jet nozzle, characterized in that the molecule separator comprises a slide element, and means mounting said slide element for movement in a direction transverse to the axis of said input of output nozzles so as to be inserted between the jet nozzle and the output nozzle to close the space therebetween and cut off the gas flow through the molecule separator and to be movable to another position to permit said gas flow.

2. An instrument according to claim 1, characterized in that the surface of said slide element is shaped to seal the output nozzle and to provide space for leakage at the jet input nozzle when the slide element is in an inserted position.

3. An instrument according to claim 1, characterized in, that the number of stages is at least two, the last stage being combined with the housing of the ion source.

lOlOl7 0739

Claims (2)

  1. 2. An instrument according to claim 1, characterized in that the surface of said slide element is shaped to seal the output nozzle and to provide space for leakage at the jet input nozzle when the slide element is in an inserted position.
  2. 3. An instrument according to claim 1, characterized in, that the number of stages is at least two, the last stage being combined with the housing of the ion source.
US3633027A 1969-04-21 1970-03-30 Mass spectrometer connected to a gap chromatograph through a valved molecule separator Expired - Lifetime US3633027A (en)

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Cited By (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3842266A (en) * 1973-04-11 1974-10-15 Us Air Force Atmospheric sampling probe for a mass spectrometer
JPS5011582U (en) * 1973-05-28 1975-02-06
JPS5047697A (en) * 1973-08-27 1975-04-28
JPS5063489U (en) * 1973-10-12 1975-06-09
US4016421A (en) * 1975-02-13 1977-04-05 E. I. Du Pont De Nemours And Company Analytical apparatus with variable energy ion beam source
US4298795A (en) * 1978-09-08 1981-11-03 Japan Spectroscopic Co. Ltd Method and apparatus for introducing samples to a mass spectrometer
US4629478A (en) * 1984-06-22 1986-12-16 Georgia Tech Research Corporation Monodisperse aerosol generator
US4687929A (en) * 1984-06-22 1987-08-18 Georgia Tech Research Corporation Monodisperse aerosol generator
US4762995A (en) * 1984-06-22 1988-08-09 Georgia Tech Research Corporation Monodisperse aerosol generator
US4791292A (en) * 1986-04-24 1988-12-13 The Dow Chemical Company Capillary membrane interface for a mass spectrometer
US4924097A (en) * 1984-06-22 1990-05-08 Georgia Tech Rss. Corp Monodisperse aerosol generator for use with infrared spectrometry
US5024952A (en) * 1989-06-26 1991-06-18 Union Carbide Chemicals And Plastics Technology Corporation Method for obtaining analytes from liquid menstrua for analysis
US5137553A (en) * 1990-03-02 1992-08-11 Sge International Pty. Ltd. Molecular jet separator
WO1997036177A1 (en) * 1996-03-27 1997-10-02 Balzers Aktiengesellschaft Arrangement for connecting a low-pressure inlet of a gas analyser
US20070205362A1 (en) * 2006-03-03 2007-09-06 Ionsense, Inc. Sampling system for use with surface ionization spectroscopy
US20080067358A1 (en) * 2006-05-26 2008-03-20 Ionsense, Inc. Apparatus for holding solids for use with surface ionization technology
US20080087812A1 (en) * 2006-10-13 2008-04-17 Ionsense, Inc. Sampling system for containment and transfer of ions into a spectroscopy system
US20080191412A1 (en) * 2007-02-09 2008-08-14 Primax Electronics Ltd. Automatic document feeder having mechanism for releasing paper jam
US20090090858A1 (en) * 2006-03-03 2009-04-09 Ionsense, Inc. Sampling system for use with surface ionization spectroscopy
US8207497B2 (en) 2009-05-08 2012-06-26 Ionsense, Inc. Sampling of confined spaces
US8440965B2 (en) 2006-10-13 2013-05-14 Ionsense, Inc. Sampling system for use with surface ionization spectroscopy
US8754365B2 (en) 2011-02-05 2014-06-17 Ionsense, Inc. Apparatus and method for thermal assisted desorption ionization systems
US8901488B1 (en) 2011-04-18 2014-12-02 Ionsense, Inc. Robust, rapid, secure sample manipulation before during and after ionization for a spectroscopy system
US9337007B2 (en) 2014-06-15 2016-05-10 Ionsense, Inc. Apparatus and method for generating chemical signatures using differential desorption
US9899196B1 (en) 2016-01-12 2018-02-20 Jeol Usa, Inc. Dopant-assisted direct analysis in real time mass spectrometry

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US3080754A (en) * 1961-07-10 1963-03-12 Charles Y Jolmson Direct method of measuring neutral gas temperatures
US3471692A (en) * 1967-03-27 1969-10-07 Varian Associates Gas analyzer system employing a gas chromatograph and a mass spectrometer with a gas switch therebetween

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3080754A (en) * 1961-07-10 1963-03-12 Charles Y Jolmson Direct method of measuring neutral gas temperatures
US3471692A (en) * 1967-03-27 1969-10-07 Varian Associates Gas analyzer system employing a gas chromatograph and a mass spectrometer with a gas switch therebetween

Cited By (58)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3842266A (en) * 1973-04-11 1974-10-15 Us Air Force Atmospheric sampling probe for a mass spectrometer
JPS5011582U (en) * 1973-05-28 1975-02-06
JPS5047697A (en) * 1973-08-27 1975-04-28
JPS546238B2 (en) * 1973-08-27 1979-03-26
JPS5063489U (en) * 1973-10-12 1975-06-09
US4016421A (en) * 1975-02-13 1977-04-05 E. I. Du Pont De Nemours And Company Analytical apparatus with variable energy ion beam source
US4298795A (en) * 1978-09-08 1981-11-03 Japan Spectroscopic Co. Ltd Method and apparatus for introducing samples to a mass spectrometer
US4924097A (en) * 1984-06-22 1990-05-08 Georgia Tech Rss. Corp Monodisperse aerosol generator for use with infrared spectrometry
US4687929A (en) * 1984-06-22 1987-08-18 Georgia Tech Research Corporation Monodisperse aerosol generator
US4762995A (en) * 1984-06-22 1988-08-09 Georgia Tech Research Corporation Monodisperse aerosol generator
US4629478A (en) * 1984-06-22 1986-12-16 Georgia Tech Research Corporation Monodisperse aerosol generator
US4791292A (en) * 1986-04-24 1988-12-13 The Dow Chemical Company Capillary membrane interface for a mass spectrometer
US5024952A (en) * 1989-06-26 1991-06-18 Union Carbide Chemicals And Plastics Technology Corporation Method for obtaining analytes from liquid menstrua for analysis
US5137553A (en) * 1990-03-02 1992-08-11 Sge International Pty. Ltd. Molecular jet separator
WO1997036177A1 (en) * 1996-03-27 1997-10-02 Balzers Aktiengesellschaft Arrangement for connecting a low-pressure inlet of a gas analyser
US6310340B1 (en) 1996-03-27 2001-10-30 Unaxis Balzers Aktiengesellschaft Arrangement for connecting a low-pressure inlet of a gas analyzer
US7700913B2 (en) 2006-03-03 2010-04-20 Ionsense, Inc. Sampling system for use with surface ionization spectroscopy
US8217341B2 (en) 2006-03-03 2012-07-10 Ionsense Sampling system for use with surface ionization spectroscopy
US20070205362A1 (en) * 2006-03-03 2007-09-06 Ionsense, Inc. Sampling system for use with surface ionization spectroscopy
US20100102222A1 (en) * 2006-03-03 2010-04-29 Ionsense, Inc. Sampling system for use with surface ionization spectroscopy
US8525109B2 (en) 2006-03-03 2013-09-03 Ionsense, Inc. Sampling system for use with surface ionization spectroscopy
US8497474B2 (en) 2006-03-03 2013-07-30 Ionsense Inc. Sampling system for use with surface ionization spectroscopy
EP1992005A2 (en) * 2006-03-03 2008-11-19 Ionsense, Inc. A sampling system for use with surface ionization spectroscopy
US20090090858A1 (en) * 2006-03-03 2009-04-09 Ionsense, Inc. Sampling system for use with surface ionization spectroscopy
EP1992005A4 (en) * 2006-03-03 2010-02-03 Ionsense Inc A sampling system for use with surface ionization spectroscopy
US8026477B2 (en) 2006-03-03 2011-09-27 Ionsense, Inc. Sampling system for use with surface ionization spectroscopy
US7705297B2 (en) 2006-05-26 2010-04-27 Ionsense, Inc. Flexible open tube sampling system for use with surface ionization technology
US20080067348A1 (en) * 2006-05-26 2008-03-20 Ionsense, Inc. High resolution sampling system for use with surface ionization technology
US7714281B2 (en) 2006-05-26 2010-05-11 Ionsense, Inc. Apparatus for holding solids for use with surface ionization technology
US20080067359A1 (en) * 2006-05-26 2008-03-20 Ionsense, Inc. Flexible open tube sampling system for use with surface ionization technology
US20100140468A1 (en) * 2006-05-26 2010-06-10 Ionsense, Inc. Apparatus for holding solids for use with surface ionization technology
US7777181B2 (en) 2006-05-26 2010-08-17 Ionsense, Inc. High resolution sampling system for use with surface ionization technology
US8481922B2 (en) 2006-05-26 2013-07-09 Ionsense, Inc. Membrane for holding samples for use with surface ionization technology
US20080067358A1 (en) * 2006-05-26 2008-03-20 Ionsense, Inc. Apparatus for holding solids for use with surface ionization technology
US8421005B2 (en) 2006-05-26 2013-04-16 Ionsense, Inc. Systems and methods for transfer of ions for analysis
US8440965B2 (en) 2006-10-13 2013-05-14 Ionsense, Inc. Sampling system for use with surface ionization spectroscopy
US7928364B2 (en) 2006-10-13 2011-04-19 Ionsense, Inc. Sampling system for containment and transfer of ions into a spectroscopy system
US20080087812A1 (en) * 2006-10-13 2008-04-17 Ionsense, Inc. Sampling system for containment and transfer of ions into a spectroscopy system
US7726650B2 (en) 2007-02-09 2010-06-01 Primax Electroncs Ltd. Automatic document feeder having mechanism for releasing paper jam
US20080191412A1 (en) * 2007-02-09 2008-08-14 Primax Electronics Ltd. Automatic document feeder having mechanism for releasing paper jam
US8895916B2 (en) 2009-05-08 2014-11-25 Ionsense, Inc. Apparatus and method for sampling of confined spaces
US8563945B2 (en) 2009-05-08 2013-10-22 Ionsense, Inc. Sampling of confined spaces
US8729496B2 (en) 2009-05-08 2014-05-20 Ionsense, Inc. Sampling of confined spaces
US9633827B2 (en) 2009-05-08 2017-04-25 Ionsense, Inc. Apparatus and method for sampling of confined spaces
US8207497B2 (en) 2009-05-08 2012-06-26 Ionsense, Inc. Sampling of confined spaces
US9390899B2 (en) 2009-05-08 2016-07-12 Ionsense, Inc. Apparatus and method for sampling of confined spaces
US8822949B2 (en) 2011-02-05 2014-09-02 Ionsense Inc. Apparatus and method for thermal assisted desorption ionization systems
US8963101B2 (en) 2011-02-05 2015-02-24 Ionsense, Inc. Apparatus and method for thermal assisted desorption ionization systems
US9514923B2 (en) 2011-02-05 2016-12-06 Ionsense Inc. Apparatus and method for thermal assisted desorption ionization systems
US9224587B2 (en) 2011-02-05 2015-12-29 Ionsense, Inc. Apparatus and method for thermal assisted desorption ionization systems
US9960029B2 (en) 2011-02-05 2018-05-01 Ionsense, Inc. Apparatus and method for thermal assisted desorption ionization systems
US8754365B2 (en) 2011-02-05 2014-06-17 Ionsense, Inc. Apparatus and method for thermal assisted desorption ionization systems
US9105435B1 (en) 2011-04-18 2015-08-11 Ionsense Inc. Robust, rapid, secure sample manipulation before during and after ionization for a spectroscopy system
US8901488B1 (en) 2011-04-18 2014-12-02 Ionsense, Inc. Robust, rapid, secure sample manipulation before during and after ionization for a spectroscopy system
US9558926B2 (en) 2014-06-15 2017-01-31 Ionsense, Inc. Apparatus and method for rapid chemical analysis using differential desorption
US9337007B2 (en) 2014-06-15 2016-05-10 Ionsense, Inc. Apparatus and method for generating chemical signatures using differential desorption
US9824875B2 (en) 2014-06-15 2017-11-21 Ionsense, Inc. Apparatus and method for generating chemical signatures using differential desorption
US9899196B1 (en) 2016-01-12 2018-02-20 Jeol Usa, Inc. Dopant-assisted direct analysis in real time mass spectrometry

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DE2014459B2 (en) 1976-05-06 application
FR2045486A5 (en) 1971-02-26 application
DE2014459A1 (en) 1970-11-05 application
GB1267121A (en) 1972-03-15 application

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