Faraday cup of ion receiver of thermal ionization mass spectrometer

Abstract

The utility model discloses a Faraday cup of an ion receiver of a thermal ionization mass spectrometer, which comprises a non-metal receiving support, a non-metal receiving electrode and a pair of external fixing metal plates, the non-metal receiving support is concaved inwards to form a notch communicated with the outside, the non-metal receiving electrode is arranged in the notch, and the external fixing metal plates are fixed on the non-metal receiving support. The pair of external fixing metal plates are oppositely fixed on the two side surfaces of the non-metal receiving bracket, and the external fixing metal plates and the non-metal receiving bracket are encircled to enable the notch to only have a state that the top is communicated with the outside, so that the whole Faraday cup retains the rigidity of metal, the outside is not easy to deform, and the service life of the Faraday cup is prolonged. The non-metallic material is adopted in the device, so that the device has the characteristic of not rebounding ions, interference on ion measurement can be effectively reduced, and the measurement accuracy is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of thermal ionization mass spectrometer, concretely relates to a thermal ionization mass spectrometer ion receiver faraday cup. BACKGROUND

[0002] The mass spectrometer aims at determining the chemical element isotope composition in a sample, the ion source functions to convert elements into positive ion forms and accelerate and focus into an ion beam, facilitating subsequent charged ion magnetic field analysis. The ion receiver functions to collect ions after electromagnetic analysis, and the charged ion movement has current, which is amplified through external equipment, and the collected ion ratio can be measured, so that the isotope ratio of different mass-to-charge ratios is measured. The working principle of the thermal ionization magnetic mass spectrometer is based on the spatial separation of solid sample elements of analyte, which are ionized by different work functions and form an ion beam, and then the content of each component is determined. In order to achieve this goal, the sample is spotted on a sample support, and then ionized by current into the ion optical lens system of the mass spectrometer, collected into a narrow beam by the ion optical system of the ion source, and accelerated to a much higher energy than the initial thermal energy propagation. The generated single ion beam is guided into a transverse uniform magnetic field (analyzer), where it is divided into multiple beams, each containing only one m / e value (ion mass / ion charge) of ions. By changing the induction of the magnetic field, the ion beam of the m / e value required for measurement can be guided into the faraday cup of the ion receiver. The ions of each ion beam provide their charges to the ion collector, that is, they generate current in their circuit. The size of the current can be used as a measure of the content of the component in the sample gas.

[0003] For example, the patent CN202211048597.8 provides a faraday cup and charged particle beam measurement method, the faraday cup includes: a cover plate and a cup body; a plurality of through holes are arranged on the cover plate, and the plurality of through holes are used for receiving a charged particle beam; the cup body is provided with an absorption cavity communicated with the plurality of through holes, and the absorption cavity is used for absorbing the charged particle beam to generate current. The material of the cup body can be stainless steel, aluminum or other metal materials.

[0004] However, the faraday cup is made of stainless steel, and the receiving electrode sheet reflects electrons, which can interfere with ion measurement and cause measurement deviation. Utility model content

[0005] The utility model aims at overcoming the above technical defects, and provides a thermal ionization mass spectrometer ion receiver faraday cup, which solves the technical problem of metal interference with ion measurement in the prior art.

[0006] In order to achieve the above technical purpose, the utility model adopts the following technical scheme:

[0007] The utility model provides a kind of thermal ionization mass spectrometer ion receiver faraday cup, including:

[0008] Nonmetal receiving support, nonmetal receiving electrode and a pair of outer fixed metal plate, the nonmetal receiving support is concave and forms gap with outside, the nonmetal receiving electrode is arranged in the gap, a pair of the outer fixed metal plate is fixed on the two sides of the nonmetal receiving support, the outer fixed metal plate, the nonmetal receiving support is enclosed to make the gap only have the state that top is communicated with outside.

[0009] In some embodiments, the nonmetal receiving support, the nonmetal receiving electrode is made of graphite material.

[0010] In some embodiments, the outer fixed metal plate is made of stainless steel material.

[0011] In some embodiments, the inner surface of the gap extends to form a protrusion, the nonmetal receiving electrode edge corresponds to the position of the protrusion and is provided with a bayonet that matches the protrusion, and the nonmetal receiving electrode is fixed relative to the nonmetal receiving support by clamping the protrusion and the bayonet.

[0012] In some embodiments, the nonmetal receiving support is provided with an embedding groove matched with the outer fixed metal plate on both sides, and the outer fixed metal plate is welded in the embedding groove, and the outer surface of the outer fixed metal plate is flush with the outer surface of the nonmetal receiving support.

[0013] In some embodiments, further comprising a suppression grid, the suppression grid is fixed on the nonmetal receiving support and located above the gap, and a grid slot on the suppression grid corresponds to the gap.

[0014] In some embodiments, further comprising an outer receiving slit member, the outer receiving slit member is installed on the suppression grid and spaced from the suppression grid.

[0015] In some embodiments, a first ceramic gasket is arranged between the suppression grid and the nonmetal receiving support, and a second ceramic gasket is arranged between the outer receiving slit member and the suppression grid.

[0016] In some embodiments, further comprising a ceramic screw, the ceramic screw is sequentially arranged in the outer receiving slit member, the second ceramic gasket, the suppression grid, the first ceramic gasket, and is threadedly connected with the nonmetal receiving support.

[0017] In some embodiments, a through hole is formed in the nonmetal receiving support, and one end of the ceramic screw extends into the through hole.

[0018] Compared with the prior art, the ion receiver Faraday cup of the thermal ionization mass spectrometer provided by the utility model has the advantages that the Faraday cup is formed by the nonmetal receiving support, the nonmetal receiving electrode and the pair of outer fixed metal plates, the nonmetal receiving support is concave to form a gap connected with the outside, the nonmetal receiving electrode is arranged in the gap, the pair of outer fixed metal plates are fixed on the two sides of the nonmetal receiving support oppositely, the outer fixed metal plates and the nonmetal receiving support enclose the gap so that the gap only has a top connected with the outside, the outer fixed metal plates make the whole Faraday cup retain the rigidity of metal and not be deformed externally, the nonmetal material is adopted in the interior, the Faraday cup has the characteristics of not rebounding ions, can effectively reduce the interference on ion measurement and improve the accuracy of measurement.

[0019] The above description is only a summary of the technical scheme of the utility model, in order to more clearly understand the technical means of the utility model, and can be implemented according to the content of the specification, as follows with the preferred embodiment of the utility model and the cooperation of the drawings detailed description.The specific embodiment of the utility model is given in detail by the following examples and its drawings. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is the structure schematic view of the ion receiver Faraday cup of the thermal ionization mass spectrometer provided by the utility model;

[0021] Figure 2 It is the explosion structure schematic view of the ion receiver Faraday cup of the thermal ionization mass spectrometer provided by the utility model.

[0022] MARKED FOR EXPLANATION:

[0023] 1-nonmetal receiving support, 11-gap, 12-protrusion, 13-embedded groove, 14-through hole, 2-nonmetal receiving electrode, 3-outer fixed metal plate, 4-suppression grid, 5-outer receiving slit piece, 6-first ceramic gasket, 7-second ceramic gasket, 8-ceramic screw. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical scheme and advantages of the utility model more clearly, the following combines the drawings and examples, and the utility model is further explained in detail.It should be understood that the specific examples described here are only used to explain the utility model, and are not used to limit the utility model.

[0025] Please refer to Figure 1 , 2The utility model provides a kind of thermal ionization mass spectrometer ion receiver faraday cup, comprising: nonmetal receiving support 1, nonmetal receiving electrode 2 and a pair of outer fixed metal plate 3, the recess 11 that is connected with outside is formed in the concave of nonmetal receiving support 1, nonmetal receiving electrode 2 is arranged in the recess 11, a pair of the outer fixed metal plate 3 is fixed on the two sides of nonmetal receiving support 1 oppositely, the outer fixed metal plate 3, nonmetal receiving support 1 enclose to make the recess 11 only have the state that top is connected with outside.

[0026] In the utility model, including: nonmetal receiving support 1, nonmetal receiving electrode 2 and a pair of outer fixed metal plate 3, the recess 11 that is connected with outside is formed in the concave of nonmetal receiving support 1, nonmetal receiving electrode 2 is arranged in the recess 11, a pair of the outer fixed metal plate 3 is fixed on the two sides of nonmetal receiving support 1 oppositely, the outer fixed metal plate 3, nonmetal receiving support 1 enclose to make the recess 11 only have the state that top is connected with outside, wherein, nonmetal receiving support 1, nonmetal receiving electrode 2 are made of nonmetal material, the outer fixed metal plate 3 is made of metal material, entire faraday cup has retained the rigidity of metal, and external deformation is not easy, its inside adopts nonmetal material, has the characteristics of not bouncing ion, can effectively reduce the interference to ion measurement, improves the accuracy of measurement.

[0027] Specifically, the inner surface of the recess 11 extends to form a protrusion 12, and the nonmetal receiving electrode 2 has a bayonet 21 corresponding to the position of the protrusion 12, which matches the protrusion 12. The nonmetal receiving electrode 2 is fixed relative to the nonmetal receiving support 1 by the clamping of the protrusion 12 and the bayonet 21. The clamping has the advantage of not introducing metal fixing parts such as bolts or screws, which can minimize the metal parts inside the faraday cup and ensure the accuracy of measurement.

[0028] Specifically, the nonmetal receiving support 1 and the nonmetal receiving electrode 2 are made of graphite material. Graphite material can absorb ions and not bounce ions, which can avoid ion bouncing inside and ensure the accuracy of measurement.

[0029] Specifically, the nonmetal receiving support 1 has a matching embedding groove 13 on both sides, and the outer fixed metal plate 3 is welded in the embedding groove 13, and the outer surface of the outer fixed metal plate 3 is flush with the outer surface of the nonmetal receiving support 1. The purpose of this arrangement is to improve the integrity of the nonmetal receiving support 1 and the outer fixed metal plate 3.

[0030] Specifically, the outer fixed metal plate 3 is made of stainless steel material. The outer fixed metal plate 3 has strong rigidity and can effectively protect the internal parts.

[0031] Further, the inhibitory grid 4 is fixed on the non-metal receiving support 1 and located above the notch 11, and the grid slot on the inhibitory grid 4 corresponds to the notch 11.

[0032] Further, the outer receiving slot member 5 is installed on the inhibitory grid 4 and spaced from the inhibitory grid 4.

[0033] Further, the first ceramic gasket 6 is arranged between the inhibitory grid 4 and the non-metal receiving support 1, and the second ceramic gasket 7 is arranged between the outer receiving slot member 5 and the inhibitory grid 4.

[0034] Further, the ceramic screw 8 is sequentially arranged in the outer receiving slot member 5, the second ceramic gasket 7, the inhibitory grid 4, the first ceramic gasket 6, and is threadedly connected with the non-metal receiving support 1.

[0035] Further, the through hole 14 is formed in the non-metal receiving support 1, and one end of the ceramic screw 8 extends into the through hole 14.

[0036] The ion receiving device of the thermal ionization mass spectrometer Faraday cup provided by the utility model has the advantages that the Faraday cup is formed by a non-metal receiving support, a non-metal receiving electrode and a pair of outer fixed metal plates, the non-metal receiving support is concave and has a notch for connecting with the outside, the non-metal receiving electrode is arranged in the notch, the pair of outer fixed metal plates are fixed on the two sides of the non-metal receiving support, the outer fixed metal plates and the non-metal receiving support enclose the notch so that the notch only has a top part connected with the outside, the Faraday cup has the rigidity of metal and is not easy to deform, the non-metal material is used in the Faraday cup, the Faraday cup has the characteristics of not rebounding ions, can effectively reduce the interference on ion measurement and improve the accuracy of measurement.

[0037] The specific embodiments of the utility model described above do not constitute a limitation on the protection scope of the utility model. Any other corresponding changes and modifications made according to the technical concept of the utility model should be included in the protection scope of the utility model claims.

Claims

1. A thermal ionization mass spectrometer ion-receiver Faraday cup, characterized in that, It includes: Non-metal receiving support, non-metal receiving electrode and a pair of external fixed metal plate, the non-metal receiving support is concave to form a notch connected with the outside, the non-metal receiving electrode is arranged in the notch, a pair of the external fixed metal plate is fixed on the two sides of the non-metal receiving support, the external fixed metal plate, the non-metal receiving support is enclosed to make the notch only have the top connected with the outside.

2. The ion receptor Faraday cup of a thermal ionization mass spectrometer of claim 1, wherein, The non-metal receiving support and the non-metal receiving electrode are made of graphite material.

3. The ion receptacle Faraday cup of a thermal ionization mass spectrometer of claim 2, wherein, The external fixed metal plate is made of stainless steel material.

4. The ion receptor Faraday cup of a thermal ionization mass spectrometer of claim 1, wherein, The inner surface of the notch extends to form a protrusion, the non-metal receiving electrode edge corresponds to the position of the protrusion and is provided with a bayonet matched with the protrusion, and the non-metal receiving electrode is fixed relative to the non-metal receiving support through the clamping of the protrusion and the bayonet.

5. The ion receptacle Faraday cup of a thermal ionization mass spectrometer of claim 2, wherein, The non-metal receiving support is provided with a embedding groove matched with the external fixed metal plate on both sides, and the external fixed metal plate is welded in the embedding groove, and the outer surface of the external fixed metal plate is flush with the outer surface of the non-metal receiving support.

6. The ion receptacle Faraday cup of a thermal ionization mass spectrometer of claim 1, wherein, It also includes an inhibition gate, which is fixed on the non-metal receiving support and above the notch, and the gate slit on the inhibition gate corresponds to the notch.

7. The ion receptacle Faraday cup of a thermal ionization mass spectrometer of claim 6, wherein, It also includes an external receiving slot member, which is installed on the inhibition gate and spaced from the inhibition gate.

8. The ion receptor Faraday cup of a thermal ionization mass spectrometer of claim 7, wherein, The first ceramic gasket is arranged between the inhibition gate and the non-metal receiving support, and the second ceramic gasket is arranged between the external receiving slot member and the inhibition gate.

9. The ion receptor Faraday cup of a thermal ionization mass spectrometer of claim 8, wherein, It also includes a ceramic screw, which is sequentially arranged in the external receiving slot member, the second ceramic gasket, the inhibition gate, the first ceramic gasket, and is threadedly connected with the non-metal receiving support.

10. The ion receptor Faraday cup of a thermal ionization mass spectrometer of claim 9, wherein, The non-metal receiving support is provided with a through hole, and one end of the ceramic screw extends into the through hole.

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