(51) Int Cl.: H01J 41/04 ( ) H01J 49/02 ( )

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1 (19) TEPZZ_Z8_4B_T (11) EP B1 (12) EUROPEAN PATENT SPECIFICATION (4) Date of publication and mention of the grant of the patent:.09.1 Bulletin 1/ (21) Application number: (22) Date of filing: (1) Int Cl.: H01J 41/04 (06.01) H01J 49/02 (06.01) (86) International application number: PCT/US02/ (87) International publication number: WO 03/0 ( Gazette 03/0) (4) APPARATUS FOR MEASURING TOTAL PRESSURE AND PARTIAL PRESSURE WITH COMMON ELECTRON BEAM VORRICHTUNG ZUR MESSUNG DES GESAMTDRUCKES UND DES PARTIALDRUCKES MIT EINEM EINZIGEN ELEKTRONENSTRAHL APPAREIL DE MESURE DE LA PRESSION TOTALE ET DE LA PRESSION PARTIELLE AU MOYEN D UN FAISCEAU D ELECTRONS COMMUN (84) Designated Contracting States: DE FR GB (43) Date of publication of application: Bulletin 0/08 (73) Proprietor: Inficon, Inc. East Syracuse, NY 17 (US) (72) Inventors: ELLEFSON, Robert, E. Manlius, NY 134 (US) FREES, Louis, C. Manlius, NY 134 (US) (74) Representative: Heyer, Volker et al HWP Intellectual Property Ridlerstrasse München (DE) (6) References cited: US-A US-A EP B1 Note: Within nine months of the publication of the mention of the grant of the European patent in the European Patent Bulletin, any person may give notice to the European Patent Office of opposition to that patent, in accordance with the Implementing Regulations. Notice of opposition shall not be deemed to have been filed until the opposition fee has been paid. (Art. 99(1) European Patent Convention). Printed by Jouve, 7001 PARIS (FR)

2 1 EP B1 2 Description FIELD OF THE INVENTION [0001] This invention pertains to the field of ionizing gas samples for mass spectrometers, and in particular to using one electron beam traversing two ionization regions to provide separate streams of ions for independently measuring both total pressure and partial pressure of the gas sample. BACKGROUND OF THE INVENTION [0002] Many scientific instruments, such as mass spectrometers, require generation of ions so that the ions may be accelerated or otherwise input into the instrument for sample identification, measurement, and other purposes. For a quadrupole residual gas analyzer, it is desirable to indicate the ionization current as a total pressure measurement, in addition to filtering the ion current to indicate specific ion species. [0003] A conventional ion source includes a filament acting as an electron emitter, an ion volume containing rarified gas, and an ion accelerator. Electrons from the filament enter the ion volume through an opening in an ionization chamber surrounding the ion volume to ionize gas molecules within the ion volume. The ion accelerator draws the resulting ions out of the ion volume and focuses them into a beam of ions suitable for injection into the quadrupole filter or other mass analysis instrument. [0004] When using such a device, it is usually desirable to have an accurate measurement of the ion stream or ion current being supplied to the quadrupole mass filter or other instrument. One conventional method for measuring ion current is typically to measure an ion current at the ion accelerator, since a portion of the ion stream impacts on the ion accelerator. However, this method has several drawbacks. The principal drawback is a change in ion fraction impacting acceleration as the mass range is scanned. For example, the ion accelerator often has electrical leakage. The measurement may also be affected by stray currents from the ionization process. [000] Another conventional method is to place an ion collector in the path of the ion stream. However, this method has the drawback of interfering with the ion stream. [0006] In addition, in both of the above methods, and in others where only a fraction of the ion stream is measured, it is difficult to judge the exact useable ion current by measuring the"test"fraction, because as the intensity of the total ion stream varies, the ratio between the"utilizable"portion of the ion stream and the"test"portion striking the measurement collector may vary in unknown ways. [0007] A method for linearization of ion currents in a quadrupole mass analyzer is described in US,889,281 A. Therein, correction factors can be applied empirically or software in a quadrupole mass analyzer system can be equipped with correcting software to expand the useful range of the mass spectrometer. [0008] Further, US,80,084 A describes an ion lens assembly for a gas analysis system. A miniaturized ion source for a mass spectrometer includes an anode and a focus plate whose interior surface forms an ionization volume for a retained gas sample. Molecules of the gas sample are ionized by electrons, and the resulting ions are concentrated and converged to an exit aperture in the focus plate through the entrance of an ion analyzer, such as a quadrupole mass filter. At least one of the anode and the focus plate may include a curved interior surface which converges the formed ions into a focused beam for directing into the ion analyzer. In addition, the thickness of the exit aperture of the focus plate and/or the setback of the focus plate relative to the anode ensures that no line of sight exits between the interior surface of the anode from which ion-forming electrons can scatter into the adjacent ion analyzer. SUMMARY OF THE INVENTION [0009] Briefly stated, an apparatus for determining both total and partial pressures of a gas using one common electron beam includes a partial pressure ionization region and a total pressure ionization region separated by a grid or aperture. A filament produces a plurality of electrons which are focused into an electron beam by a repeller and an anode. The interaction between the electron beam and molecules of said gas within the partial pressure and total pressure regions produces first and second ion streams. A focus plate is biased such that the first ion stream is directed to an analyzer which calculates the partial pressure of the gas. An ion collector collects the ions from the second ion stream, where the resulting reference current is used to determine the total pressure of the gas. [00] According to an embodiment of the invention, an apparatus for determining a total pressure of a gas includes an ionization chamber; the ionization chamber having first and second ionization regions, wherein a boundary between the regions is defined by an anode grid or aperture; means for producing an electron beam passing through the first and second ionization regions, whereby an interaction between the electron beam and molecules of the gas within the ionization chamber produce first and second ion streams from a same gas density; means for directing the first ion stream to an analyzer; and means for directing the second ion stream to an ion collector. [0011] According to an embodiment of the invention, an apparatus for determining a total pressure of a gas includes an ionization chamber; the ionization chamber having first and second ionization regions, wherein a boundary between the regions is defined by an anode grid or aperture; a filament for producing a plurality of electrons ; a repeller; the repeller and anode operatively associated to focus the plurality of electrons into an elec- 2

3 3 EP B1 4 tron beam passing through the first and second ionization regions, whereby an interaction between the electron beam and molecules of the gas within the ionization chamber produces first and second ion streams from a same gas density; a focus plate biased such that the first ion stream is directed to an analyzer, wherein the analyzer includes means for calculating at least one partial pressure of the gas within the ionization chamber; an ion collector biased such that the second ion stream is directed to an ion collector; means for measuring a reference current produced by the second ion stream at the ion collector; and means, using the reference current, for calculating the total pressure of the gas within the ionization chamber. [0012] According to an embodiment of the invention, a method for determining a total pressure of a gas includes (a) providing an ionization chamber, the ionization chamber having first and second ionization regions, wherein a boundary between the regions is defined by an anode grid or aperture; (b) producing an electron beam passing through the first and second ionization regions, whereby an interaction between the electron beam and molecules of the gas within the ionization chamber produce first and second ion streams from a same gas density; (c) directing the first ion stream to an analyzer; and (d) directing the second ion stream to an ion collector. BRIEF DESCRIPTION OF THE DRAWINGS [0013] Fig. 1 shows a partial cross-sectional view of an embodiment of the present invention. Fig. 2 shows a side view of a portion of the embodiment of Fig. 1. Fig. 3 shows a partial cross-sectional view of an embodiment of the present invention. Fig. 4 shows an ion optics plot of electron and ion trajectories according to the embodiment of Fig. 3. Fig. shows a total pressure current and Ar- ion current as a function of Ar pressure as measured by the present invention. DETAILED DESCRIPTION OF THE PREFERRED EM- BODIMENT [0014] Referring to Figs. 1-2, an electron beam is emitted from a filament 12. The electrons in electron beam are focused by a three-sided repeller 14 which is mounted such that a center of filament 12 is at the center of diagonals drawn from the corners of repeller 14. Repeller 14 is connected to the negative side of filament 12, thus making repeller 14 more negative than the potential of emitted electrons by an amount equal to the filament voltage with respect to the negative lead at the point the electron is emitted. This is approximately onehalf the voltage across the filament ( 1. V). [001] The electrons in electron beam are drawn to an anode 16 by a voltage that is positive with respect to filament 12. Anode 16 is preferably biased at 70 V. Anode 16 separates a first region from a second region 22. Electron beam forms ions in both the first and second regions, 22. A plurality of ions from first region are extracted by a focus plate 24 and directed to a mass analysis device, where they form ion currents proportional to pressures of gas components in region. A plurality of ions 32 from second region 22 are collected by an ion collection device, such as a collector plate 26, to produce a current proportional to the total pressure of gas components in second region 22. [0016] The electrons in electron beam continue through first and second regions, 22 and impact on a beam stop 28. Anode 16 and beam stop 28 together function as an anode for electron beam, resulting in the acceleration of electrons in electron beam being perpendicular to the equipotential lines established by the structure, thus resulting in a focused beam. [0017] Referring to Fig. 3, an embodiment of the invention includes a square anode 16 that more efficiently draws electrons from filament 12 through a flat grid 18 on an entrance side of anode 16. The higher efficiency for electrons in the anode 16 region results in increased ion formation in first and second regions, 22. [0018] Referring to Fig. 4, an ion optics plot of electron and ion trajectories is shown. The accelerations of the electrons are perpendicular to the equipotential lines 34 established by the structure which results in a focused beam. Ions formed in the partial pressure ionization region (first region ) by electron beam are drawn toward focus plate 24 and form the stream of ions for separation by a mass analyzer (not shown). Ions 32 formed in the total pressure ionization region (second region 22) by the continuation of electron beam are collected by total pressure collector plate 26. [0019] Referring to Fig., the total pressure ion current and mass analyzed ion current produced with 00 ua of electron emission are shown for a wide range of Ar gas pressure. The total pressure ion current responds linearly with pressure over the range. The Mass ion current responds linearly to Ar pressure up to 3E-8 bar (2 E- Torr). At higher pressures the ion current is attenuated from the expected ion current due to gas scattering by a factor exp[-k P] where k is a constant and P is the process pressure. [00] While the present invention has been described with reference to a particular preferred embodiment and the accompanying drawings, it will be understood by those skilled in the art that the invention is not limited to the preferred embodiment and that various modifications and the like could be made thereto without departing from the scope of the invention as defined in the following claims. 3

4 EP B1 6 Claims 1. An apparatus for determining a total pressure of a gas, comprising: an ionization chamber; means for producing an electron beam (); means for directing an first ion stream () to an analyzer; and means for directing an second ion stream (32) to an ion collector (26), characterized in that said ionization chamber having first () and second ionization regions (22), wherein a boundary between said regions (, 22) is defined by one of an aperture and an anode grid (18); and said electron beam () passing through said first () and second ionization regions (22), whereby an interaction between said electron beam () and molecules of said gas within said ionization chamber produces said first () and second ion streams (32) from a same gas density. 2. An apparatus according to claim 1, further comprising: 1 2 emission means for emitting a plurality of electrons; and focusing means for focusing said plurality of electrons into said electron beam (). 7. An apparatus according to claim 6, wherein said focusing means includes a repeller (14) having three sides and an opening for said electron beam () to pass through. 8. An apparatus according to claim 1, wherein said anode grid (18) has a rectangular cross-section. 9. An apparatus according to claim 8, wherein said anode grid (18) includes a flat portion that is oriented perpendicular to said electron beam ().. An apparatus according to claim 1, wherein said electron beam () passes through said first ionization region () before said electron beam () passes through said second ionization region (22). 11. An apparatus according to claim 1, wherein said electron beam () passes through said second ionization region (22) before said electron beam () passes through said first ionization region (). means for collecting said second ion stream (32) at said ion collector (26); means for measuring a reference current produced by said second ion stream (32) at said ion collector (26); and means, using said reference current, for calculating said total pressure of said gas within said ionization chamber. 3. An apparatus according to claim 2, wherein said analyzer includes means for calculating at least one partial pressure of said gas within said ionization chamber. 4. An apparatus according to claim 3, further comprising an electron beam stop (28) which collects substantially all electrons not interacting with said gas molecules.. An apparatus according to claim 4, wherein said means for producing an electron beam () comprises: emission means for emitting a plurality of electrons; and focusing means for focusing said plurality of electrons into said electron beam (). 6. An apparatus according to claim 1, wherein said means for producing an electron beam () comprises: An apparatus according to claim 1, wherein said means for producing an electron beam () comprising: a filament (12) for producing a plurality of electrons; a repeller (14); said repeller (14) and an anode (16) operatively associated to focus said plurality of electrons into said electron beam () passing through said first () and second ionization regions (22), whereby an interaction between said electron beam () and molecules of said gas within said ionization chamber produces said first () and said second ion streams (32) from a same gas density; said means for directing said first ion stream () to said analyzer comprising: a focus plate (24) biased such that said first ion stream () is directed to said analyzer, wherein said analyzer includes means for calculating at least one partial pressure of said gas within said ionization chamber; said means for directing said second ion stream (32) to said ion collector (26) comprising: an ion collector (26) biased such that said second ion stream (32) is directed to an ion collector 4

5 7 EP B1 8 (26); means for measuring a reference current produced by said second ion stream (32) at said ion collector (26); and means, using said reference current, for calculating said total pressure of said gas within said ionization chamber. 13. An apparatus according to claim 12, wherein said anode grid (18) has a rectangular cross-section. 14. An apparatus according to claim 13, wherein said anode grid (18) includes a flat portion that is oriented perpendicular to said electron beam (). 1. A method for determining a total pressure of a gas, comprising the steps of: providing an ionization chamber, said ionization chamber having first () and second ionization regions (22), wherein a boundary between said regions (, 22) is defined by one of an aperture and an anode grid ; producing an electron beam () passing through said first () and second ionization regions (22), whereby an interaction between said electron beam () and molecules of said gas within said ionization chamber produces first () and second ion streams (32) from a same gas density; directing said first ion stream () to an analyzer; and directing said second ion stream (32) to an ion collector (26). 16. A method according to claim 1, further comprising the steps of: collecting said second ion stream (32) at said ion collector (26); measuring a reference current produced by said second ion stream (32) at said ion collector (26); and calculating, using said reference current, said total pressure of said gas within said ionization chamber eine Ionisationskammer, ein Mittel zum Erzeugen eines Elektronenstrahls (), ein Mittel zum Ausrichten eines ersten Ionenstroms () in Richtung eines Analysators; und ein Mittel zum Ausrichten eines zweiten Ionenstroms (32) in Richtung eines Ionenauffängers (26) und die Vorrichtung ist dadurch gekennzeichnet, dass die Ionisationskammer eine erste () und eine zweite Ionisationsregion (22) umfasst, wobei eine Grenze zwischen den Regionen (, 22) durch eine Öffnung oder ein Anodengitter (18) definiert ist; und der Elektronenstrahl () die erste () und die zweite Ionisationsregion (22) durchläuft, wodurch eine Wechselwirkung zwischen dem Elektronenstrahl () und Molekülen des Gases innerhalb der Ionisationskammer den ersten () und den zweiten Ionenstrom (32) mit einer gleichen Gasdichte erzeugt. 2. Eine Vorrichtung gemäß Patentanspruch 1, weiterhin umfassend: ein Mittel zum Sammeln des zweiten Ionenstroms (32) am Ionenauffänger (26); ein Mittel zum Messen eines Referenzstroms, der durch den zweiten Ionenstrom (32) am Ionenauffänger (26) erzeugt wird; und ein Mittel zum Berechnen des Gesamtdrucks des Gases innerhalb der Ionisationskammer unter Verwendung des Referenzstroms. 3. Eine Vorrichtung gemäß Patentanspruch 2, wobei der Analysator ein Mittel zum Berechnen von mindestens einem Partialdruck des Gases innerhalb der Ionisationskammer umfasst. 4. Eine Vorrichtung gemäß Patentanspruch 3, weiterhin umfassend einen Elektronenstrahlfänger (28), der weitestgehend alle Elektronen sammelt, die nicht mit den Gasmolekülen wechselwirken.. Eine Vorrichtung gemäß Patentanspruch 4, wobei das Mittel zum Erzeugen eines Elektronenstrahls () umfasst: ein Emissionsmittel zum Emittieren einer Mehrzahl von Elektronen; und ein Fokussiermittel, um die Mehrzahl von Elektronen in den Elektronenstrahl () zu bündeln. Patentansprüche 1. Eine Vorrichtung zum Bestimmen eines Gesamtdrucks eines Gases, umfassend: 0 6. Eine Vorrichtung gemäß Patentanspruch 1, wobei das Mittel zum Erzeugen eines Elektronenstrahls () umfasst: ein Emissionsmittel zum Emittieren einer Mehrzahl von Elektronen; und ein Fokussiermittel, um die Mehrzahl von Elektronen in den Elektronenstrahl () zu bündeln.

6 9 EP B1 7. Eine Vorrichtung gemäß Patentanspruch 6, wobei das Fokussiermittel einen Reflektor (14) umfasst, der drei Seiten und eine Öffnung zum Durchlaufen des Elektronstrahls () aufweist. 8. Eine Vorrichtung gemäß Patentanspruch 1, wobei das Anodengitter (18) einen rechteckigen Querschnitt aufweist. einen Heizfaden (12), um eine Mehrzahl von Elektronen zu erzeugen; einen Reflektor (14); wobei der Reflektor (14) und eine Anode (16) wirkverbunden sind, um die Mehrzahl von Elektronen in den Elektronenstrahl () zu bündeln, der die erste () und die zweite Ionisationsregion (22) durchläuft, wodurch eine Wechselwirkung zwischen dem Elektronenstrahl () und Molekülen des Gases innerhalb der Ionisationskammer den ersten () und den zweiten Ionenstrom (32) mit einer gleichen Gasdichte erzeugt; wobei das Mittel zum Ausrichten des ersten Ionenstroms () in Richtung des Analysators weiterhin umfasst: eine Fokussierplatte (24), die derart vorgespannt ist, dass der erste Ionenstrom () in Richtung des Analysators ausgerichtet wird, wobei der Analysator ein Mittel zum Berechnen von mindestens einem Partialdruck des Gases innerhalb der Ionisationskammer aufweist; wobei das Mittel zum Ausrichten des zweiten Ionenstroms (32) in Richtung des Ionenauffängers (26) umfasst: einen Ionenauffänger (26), der derart vorgespannt ist, dass der zweite Ionenstrom (32) in Richtung eines Ionenauffängers (26) ausgerichtet wird; sowie ein Mittel zum Messen eines Referenzstroms, der durch den zweiten Ionenstrom (32) am Ionenauffänger (26) erzeugt wird; und ein Mittel zum Berechnen des Gesamtdrucks des Gases innerhalb der Ionisationskammer unter Verwendung des Referenzstroms. 13. Eine Vorrichtung gemäß Patentanspruch 12, wobei das Anodengitter (18) einen rechteckigen Querschnitt aufweist. 9. Eine Vorrichtung gemäß Patentanspruch 8, wobei das Anodengitter (18) einen flachen Abschnitt umfasst, der senkrecht zum Elektronenstrahl () ausgerichtet ist. 14. Eine Vorrichtung gemäß Patentanspruch 13, wobei das Anodengitter (18) einen flachen Abschnitt umfasst, der senkrecht zum Ionenstrahl () ausgerichtet ist.. Eine Vorrichtung gemäß Patentanspruch 1, wobei der Elektronenstrahl () die erste Ionisationsregion () durchläuft, bevor der Elektronenstrahl () die zweite Ionisationsregion (22) durchläuft. 11. Eine Vorrichtung gemäß Patentanspruch 1, wobei der Elektronenstrahl () die zweite Ionisationsregion (22) durchläuft, bevor der Elektronenstrahl () die erste Ionisationsregion () durchläuft. 12. Eine Vorrichtung gemäß Patentanspruch 1, wobei das Mittel zum Erzeugen eines Elektronenstrahls () umfasst: Ein Verfahren zum Bestimmen eines Gesamtdrucks eines Gases, das die folgenden Schritte aufweist: Bereitstellen einer Ionisationskammer, die eine erste () und eine zweite Ionisationsregion (22) aufweist, wobei eine Grenze zwischen den Regionen (, 22) durch eine Öffnung oder ein Anodengitter definiert ist; Erzeugen eines Elektronenstrahls (), der die erste () und die zweite Ionisationsregion (22) durchläuft, wodurch eine Wechselwirkung zwischen dem Elektronenstrahl () und Molekülen des Gases innerhalb der Ion isationskammer einen ersten () und einen zweiten Ionenstrom (32) mit einer gleichen Gasdichte erzeugt; Ausrichten des ersten Ionenstroms () in Richtung eines Analysators; und Ausrichten des zweiten Ionenstroms (32) in Richtung eines Ionenauffängers (26). 16. Ein Verfahren gemäß Patentanspruch 1, das die weiteren Schritte aufweist: Sammeln des zweiten Ionenstroms (32) am Ionenauffänger (26); Messen eines Referenzstroms, der durch den zweiten Ionenstrom (32) am Ionenauffänger (26) erzeugt wird; und Berechnen des Gesamtdrucks des Gases innerhalb der Ionisationskammer unter Verwendung des Referenzstroms. Revendications 1. Appareil de détermination d une pression totale d un gaz comprenant : une chambre d ionisation ; un moyen de production d un faisceau d électrons () ; un moyen de direction d un premier courant ionique () vers un analyseur ; et un moyen de direction d un second courant io- 6

7 11 EP B1 12 nique (32) vers un collecteur d ions (26), caractérisé en ce que ladite chambre d ionisation ayant des première () et seconde régions d ionisation (22), dans lequel une limite entre lesdites régions (, 22) est définie par un élément parmi une ouverture et un réseau d anode (18) ; et ledit faisceau d électrons () passant à travers lesdites première () et seconde régions d ionisation (22), moyennant quoi une interaction entre ledit faisceau d électrons () et des molécules dudit gaz au sein de ladite chambre d ionisation produit lesdits premier () et second courants ioniques (32) à partir d une même densité gazeuse. 2. Appareil selon la revendication 1, comprenant en outre : un moyen de recueil dudit second courant ionique (32) au niveau dudit collecteur d ions (26) ; un moyen de mesure d un courant de référence produit par ledit second courant ionique (32) au niveau dudit collecteur d ions (26) ; et un moyen de calcul de ladite pression totale dudit gaz au sein de ladite chambre d ionisation en utilisant ledit courant de référence. 3. Appareil selon la revendication 2, dans lequel ledit analyseur inclut un moyen de calcul d au moins une pression partielle dudit gaz au sein de ladite chambre d ionisation. 4. Appareil selon la revendication 3, comprenant en outre un arrêt de faisceau d électrons (28) qui recueille essentiellement l ensemble des électrons n interagissant pas avec lesdites molécules gazeuses.. Appareil selon la revendication 4, dans lequel ledit moyen de production d un faisceau d électrons () comprend : un moyen d émission pour émettre une pluralité d électrons ; et un moyen de concentration pour concentrer ladite pluralité d électrons dans ledit faisceau d électrons (). 6. Appareil selon la revendication 1, dans lequel ledit moyen de production d un faisceau d électrons () comprend : un moyen d émission pour émettre une pluralité d électrons ; et un moyen de concentration pour concentrer ladite pluralité d électrons dans ledit faisceau d électrons () Appareil selon la revendication 6, dans lequel ledit moyen de concentration inclut un réflecteur (14) ayant trois côtés et une ouverture pour que ledit faisceau d électrons () passe à travers. 8. Appareil selon la revendication 1, dans lequel ledit réseau d anode (18) a une section transversale rectangulaire. 9. Appareil selon la revendication 8, dans lequel ledit réseau d anode (18) inclut une portion plate qui est orientée perpendiculairement audit faisceau d électrons ().. Appareil selon la revendication 1, dans lequel ledit faisceau d électrons () passe à travers ladite première région d ionisation () avant que ledit faisceau d électrons () passe à travers ladite seconde région d ionisation (22). 11. Appareil selon la revendication 1, dans lequel ledit faisceau d électrons () passe à travers ladite seconde région d ionisation (22) avant que ledit faisceau d électrons () passe à travers ladite première région d ionisation (). 12. Appareil selon la revendication 1, dans lequel ledit moyen de production d un faisceau d électrons () comprend : un filament (12) pour produire une pluralité d électrons ; un réflecteur (14) ; ledit réflecteur (14) et une anode (16) étant associés de manière opérationnelle pour concentrer ladite pluralité d électrons dans ledit faisceau d électrons () passant à travers lesdites première () et seconde régions d ionisation (22), moyennant quoi une interaction entre ledit faisceau d électrons () et des molécules dudit gaz au sein de ladite chambre d ionisation produit ledit premier () et ledit second courants ioniques (32) à partir d une même densité gazeuse ; ledit moyen de direction dudit premier courant ionique () vers ledit analyseur comprend : une plaque de concentration (24) inclinée de sorte que ledit premier courant ionique () est dirigé vers ledit analyseur, dans lequel ledit analyseur inclut un moyen de calcul d au moins une pression partielle dudit gaz au sein de ladite chambre d ionisation ; ledit moyen de direction dudit second courant ionique (32) vers ledit collecteur d ions (26) comprend : 7

8 13 EP B1 14 un collecteur d ions (26) incliné de sorte que ledit second courant ionique (32) est dirigé vers un collecteur d ions (26) ; un moyen de mesure d un courant de référence produit par ledit second courant ionique (32) au niveau dudit collecteur d ions (26) ; et un moyen de calcul de ladite pression totale dudit gaz au sein de ladite chambre d ionisation en utilisant ledit courant de référence. 13. Appareil selon la revendication 12, dans lequel ledit réseau d anode (18) a une section transversale rectangulaire Appareil selon la revendication 13, dans lequel ledit réseau d anode (18) inclut une portion plate qui est orientée perpendiculairement audit faisceau d électrons (). 1. Procédé de détermination d une pression totale d un gaz comprenant les étapes consistant à : fournir une chambre d ionisation, ladite chambre d ionisation ayant des première () et seconde régions d ionisation (22), dans lequel une limite entre lesdites régions (, 22) est définie par un élément parmi une ouverture et un réseau d anode ; produire un faisceau d électrons () passant à travers lesdites première () et seconde régions d ionisation (22), moyennant quoi une interaction entre ledit faisceau d électrons () et des molécules dudit gaz au sein de ladite chambre d ionisation produit des premier () et second courants ioniques (32) à partir d une même densité gazeuse ; diriger ledit premier courant ionique () vers un analyseur ; et diriger ledit second courant ionique (32) vers un collecteur d ions (26) Procédé selon la revendication 1, comprenant en outre les étapes consistant à : 4 recueillir ledit second courant ionique (32) au niveau dudit collecteur d ions (26) ; mesurer un courant de référence produit par ledit second courant ionique (32) au niveau dudit collecteur d ions (26) ; et calculer ladite pression totale dudit gaz au sein de ladite chambre d ionisation en utilisant ledit courant de référence. 0 8

9 EP B1 9

10 EP B1

11 EP B1 11

12 EP B1 REFERENCES CITED IN THE DESCRIPTION This list of references cited by the applicant is for the reader s convenience only. It does not form part of the European patent document. Even though great care has been taken in compiling the references, errors or omissions cannot be excluded and the EPO disclaims all liability in this regard. Patent documents cited in the description US A [0007] US A [0008] 12

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