Electronic time-of-flight spectrometer

Abstract

The utility model relates to the technical field of atomic molecular physics, and particularly discloses an electronic time-of-flight spectrometer which comprises an eTOF pipeline, a three-way pipe, an MCP, a drift tube, a first magnetic shielding tube, a second magnetic shielding tube, a first flange, a second flange, a plurality of first bolts, a Nose, a copper net, an electrostatic lens assembly and an installation assembly. One end of the drift tube is inserted into the three-way tube, the drift tube is sleeved with the first magnetic shielding tube, the second magnetic shielding tube is sleeved with the second magnetic shielding tube, the first flange is arranged at one end of the second magnetic shielding tube, the eTOF pipeline is arranged on one side of the second flange, and the electrostatic lens assembly is arranged in the eTOF pipeline. The copper net is arranged in the eTOF pipeline, the Nose is arranged at one end of the eTOF pipeline, and through the arrangement, the problems that in the prior art, electron focusing precision is low, a magnetic field is inconvenient to adjust, cost is high, and machining is not easy are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of atomic and molecular physics, in particular to an electron time-of-flight spectrometer. Background Art

[0002] Time-of-flight spectrometers are mainly used to measure the energy or momentum of electrons or ions excited by photoionization. The principle is to convert the kinetic energy or momentum of charged particles by measuring the time required for them to fly a certain distance. However, when measuring the momentum or energy of photoelectrons, ions, existing time-of-flight spectrometers must shorten the measurement time in order to improve the signal-to-noise ratio, resulting in low collection efficiency.

[0003] In order to solve the above technical problems, the existing patent document with the announcement number (CN112509906B) discloses a magnetic focusing flight tube and a magnetic focusing time-of-flight spectrometer, including a flight tube body, an outlet strong magnet and a particle detector. The flight tube body, the outlet strong magnet and the particle detector are all located in a vacuum chamber. The particle detector and the outlet strong magnet are sequentially arranged at the rear end of the outlet of the flight tube body. The outlet strong magnet is used to concentrate the particles to be measured and be received by the particle detector. The S pole of the outlet strong magnet faces the outlet of the flight tube body, and the particles to be measured are electrons. The N pole of the outlet strong magnet faces the outlet of the flight tube body, and the particles to be measured are ions. The flight tube has a high collection efficiency for electrons or ions. When the flight tube is used in a time-of-flight spectrometer, it can more accurately obtain the kinetic energy or momentum measurement results of electrons and ions.

[0004] However, in the above-mentioned prior art, the precision of focusing electrons is low, it is inconvenient to adjust the magnetic field, and the cost is high and difficult to process. Utility Model Content

[0005] The purpose of the utility model is to provide an electron time-of-flight spectrometer, aiming to solve the technical problems in the prior art of low precision in focusing electrons, inconvenience in adjusting the magnetic field, high cost and difficulty in processing.

[0006] To achieve the above-mentioned objectives, the present invention adopts an electron time-of-flight spectrometer, including an eTOF pipe, a tee, an MCP, a drift tube, a first magnetic shielding tube, a second magnetic shielding tube, a first flange, a second flange, multiple first bolts, a nose, a copper mesh, an electrostatic lens assembly and a mounting assembly, wherein the MCP is arranged at one end of the tee, one end of the drift tube is inserted into the interior of the tee, the first magnetic shielding tube is sleeved on the outside of the drift tube, the second magnetic shielding tube is sleeved on the outside of the second magnetic shielding tube, the first flange is arranged at one end of the second magnetic shielding tube, the second flange is fitted with the first flange, multiple first bolts respectively pass through the second flange and are respectively threadedly connected to the first flange, the eTOF pipe is arranged on one side of the second flange, the electrostatic lens assembly is arranged inside the eTOF pipe, the copper mesh is arranged inside the eTOF pipe, the nose is arranged at one end of the eTOF pipe, and the mounting assembly is arranged on the outside of the second magnetic shielding tube.

[0007] Among them, the mounting assembly includes a third flange and multiple second bolts. The third flange is sleeved on the outside of the second magnetic shielding tube and fits with the tee. Multiple second bolts pass through the third flange respectively and are threadedly connected to the tee.

[0008] In which, the electrostatic lens assembly includes an insulating plate, multiple first electrode sheets, multiple second electrode sheets, multiple groups of first fixing members and multiple groups of second fixing members. The insulating plate is arranged between the first flange and the second flange, and the multiple first electrode sheets are arranged in sequence on one side of the insulating plate. The multiple groups of first fixing members respectively penetrate the multiple first electrode sheets, and the multiple second electrode sheets are arranged in sequence on the side of the insulating plate away from the multiple first electrode sheets. The multiple groups of second fixing members respectively penetrate the multiple second electrode sheets.

[0009] Each group of the first fixing members includes a first insulating rod, a first insulating sheet and a first nut. The first insulating rod sequentially passes through multiple first electrode sheets and the first insulating sheet. The first nut is threadedly connected to the first insulating rod.

[0010] Each group of the second fixing members includes a second insulating rod, a second insulating sheet and a second nut. The second insulating rod sequentially passes through multiple second electrode sheets and the second insulating sheet. The second nut is threadedly connected to the first insulating rod.

[0011] The first magnetic shielding tube has a plurality of first circular holes, and the second magnetic shielding tube has a plurality of second circular holes.

[0012] The utility model provides an electron time-of-flight spectrometer. When it is used, the Nose is aimed at the electron generation area. The generated electrons pass through the copper mesh and enter the electrostatic lens assembly. The electrodes at each level in the electrostatic lens assembly generate an electric field, thereby focusing the generated electrons. The focused electrons then pass through the drift tube to the MCP. The electrostatic lens assembly can apply voltage separately, so the electric field can be adjusted as needed to obtain different electron focusing effects. This method can effectively solve the problems in the prior art of low precision in focusing electrons, inconvenience in adjusting the magnetic field, high cost and difficulty in processing. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0014] Figure 1 It is a structural diagram of the present utility model.

[0015] Figure 2 It is a sectional view of the overall structure of the utility model.

[0016] Figure 3 It is a partial structural diagram of the utility model.

[0017] Figure 4 It is a partial structural diagram of the utility model.

[0018] 101-eTOF pipe, 102-tee pipe, 103-MCP, 104-drift tube, 105-first magnetic shielding tube, 106-first circular hole, 107-second magnetic shielding tube, 108-second circular hole, 109-first flange, 110-second flange, 111-first bolt, 112-Nose, 113-copper mesh, 114-third flange, 115-second bolt, 116-insulating plate, 117-first electrode sheet, 118-second electrode sheet, 119-first insulating rod, 120-first insulating sheet, 121-first nut, 122-second insulating rod, 123-second insulating sheet, 124-second nut. DETAILED DESCRIPTION

[0019] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0020] See also Figures 1 to 4 ,in Figure 1 It is a structural diagram of the utility model. Figure 2 This is a sectional view of the overall structure of the utility model. Figure 3 This is a partial structural diagram of the utility model. Figure 4 It is a partial structural diagram of the utility model.

[0021] The utility model provides an electron time-of-flight spectrometer, comprising an eTOF pipeline 101, a tee pipe 102, an MCP 103, a drift tube 104, a first magnetic shielding tube 105, a second magnetic shielding tube 107, a first flange 109, a second flange 110, a plurality of first bolts 111, a nose 112, a copper mesh 113, an electrostatic lens assembly and a mounting assembly, wherein the MCP 103 is arranged at one end of the tee pipe 102, one end of the drift tube 104 is inserted into the interior of the tee pipe 102, the first magnetic shielding tube 105 is sleeved on the outside of the drift tube 104, and the second magnetic shielding tube 107 is sleeved on the second magnetic shielding tube 107. The first flange 109 is arranged on the outside of the second magnetic shielding tube 107, the second flange 110 is fitted with the first flange 109, and multiple first bolts 111 respectively pass through the second flange 110 and are respectively threadedly connected to the first flange 109. The eTOF pipe 101 is arranged on one side of the second flange 110, the electrostatic lens assembly is arranged inside the eTOF pipe 101, the copper mesh 113 is arranged inside the eTOF pipe 101, the Nose 112 is arranged at one end of the eTOF pipe 101, and the mounting assembly is arranged on the outside of the second magnetic shielding tube 107.

[0022] In this embodiment, the Nose 112 is aligned with the electron generation area, and the generated electrons pass through the copper mesh 113 into the electrostatic lens assembly. The electrodes at each level in the electrostatic lens assembly generate an electric field, thereby focusing the generated electrons. The focused electrons then pass through the drift tube 104 to the MCP 103. The electrostatic lens assembly can apply voltage separately, so the electric field can be adjusted as needed to obtain different electron focusing effects.

[0023] Furthermore, the mounting assembly includes a third flange 114 and a plurality of second bolts 115. The third flange 114 is sleeved on the outside of the second magnetic shielding tube 107 and fits with the tee pipe 102. The plurality of second bolts 115 respectively pass through the third flange 114 and are respectively threadedly connected to the tee pipe 102.

[0024] In this embodiment, the third flange 114 is fixed to the tee pipe 102 by a plurality of second bolts 115 , thereby installing the first magnetic shielding tube 105 and the second magnetic shielding tube 107 .

[0025] Furthermore, the electrostatic lens assembly includes an insulating plate 116, multiple first electrode sheets 117, multiple second electrode sheets 118, multiple groups of first fixing members and multiple groups of second fixing members. The insulating plate 116 is arranged between the first flange 109 and the second flange 110, and the multiple first electrode sheets 117 are arranged in sequence on one side of the insulating plate 116. The multiple groups of first fixing members respectively penetrate the multiple first electrode sheets 117. The multiple second electrode sheets 118 are arranged in sequence on the side of the insulating plate 116 away from the multiple first electrode sheets 117. The multiple groups of second fixing members respectively penetrate the multiple second electrode sheets 118.

[0026] In this embodiment, multiple sets of the first fixing members are used to mount multiple first electrode sheets 117 , and multiple sets of the second fixing members are used to mount multiple second electrode sheets 118 .

[0027] Furthermore, each group of the first fixing members includes a first insulating rod 119 , a first insulating sheet 120 and a first nut 121 . The first insulating rod 119 sequentially passes through multiple first electrode sheets 117 and the first insulating sheet 120 . The first nut 121 is threadedly connected to the first insulating rod 119 .

[0028] In this embodiment, the first insulating rod 119 is sequentially passed through the plurality of first electrode sheets 117 and the first insulating sheet 120 , and then the first nut 121 is tightened, thereby installing the plurality of first electrode sheets 117 .

[0029] Furthermore, each set of the second fixing members includes a second insulating rod 122 , a second insulating sheet 123 and a second nut 124 . The second insulating rod 122 sequentially passes through multiple second electrode sheets 118 and the second insulating sheet 123 . The second nut 124 is threadedly connected to the first insulating rod 119 .

[0030] In this embodiment, the second insulating rod 122 is sequentially passed through the plurality of second electrode sheets 118 and the second insulating sheet 123 , and then the second nut 124 is tightened, thereby installing the plurality of second electrode sheets 118 .

[0031] Furthermore, the first magnetic shielding tube 105 has a plurality of first circular holes 106 , and the second magnetic shielding tube 107 has a plurality of second circular holes 108 .

[0032] In this embodiment, the first circular hole 106 and the second circular hole 108 are used for threading.

[0033] The beneficial effects of the present invention are as follows: the Nose 112 is aligned with the electron generation area, and the generated electrons pass through the copper mesh 113 into the plurality of first electrode sheets 117 and the plurality of second electrode sheets 118, and the electrodes at each level in the plurality of first electrode sheets 117 and the plurality of second electrode sheets 118 generate an electric field, thereby focusing the generated electrons, and the focused electrons then pass through the drift tube 104 to the MCP 103, and the plurality of first electrode sheets 117 and the plurality of second electrode sheets 118 can be applied with voltages separately, so the electric field can be adjusted as needed to obtain different electron focusing effects, and the first electrode sheets 117 and the plurality of second electrode sheets 118 can be applied with voltages separately, so that the electric field can be adjusted as needed to obtain different electron focusing effects, and the first electrode sheets 117 and the plurality of second electrode sheets 118 can be applied with voltages separately ... The second electrode pieces 118 are all made of titanium alloy, which is easier to produce than the magnets used for magnetic focusing, and the quality and effect are easier to control. The multiple first electrode pieces 117 and the multiple second electrode pieces 118 are installed through half tooling, which can ensure the concentricity of the multiple first electrode pieces 117 and the multiple second electrode pieces 118, thereby ensuring the effect of focusing electrons. The first magnetic shielding tube 105 and the second magnetic shielding tube 107 have staggered openings to facilitate threading, while ensuring magnetic shielding and vacuuming effects. This method can effectively solve the problems in the existing technology of low precision in focusing electrons, inconvenience in adjusting the magnetic field, high cost and difficulty in processing.

[0034] The above disclosure is only a preferred embodiment of the present invention, and certainly cannot be used to limit the scope of rights of the present invention. Ordinary technicians in this field can understand that all or part of the processes of the above embodiment and equivalent changes made in accordance with the claims of the present invention are still within the scope of the utility model.

Claims

1. An electron time-of-flight spectrometer, characterized in that It includes an eTOF pipe, a tee, an MCP, a drift tube, a first magnetic shielding tube, a second magnetic shielding tube, a first flange, a second flange, multiple first bolts, a nose, a copper mesh, an electrostatic lens assembly and a mounting assembly. The MCP is arranged at one end of the tee, one end of the drift tube is inserted into the interior of the tee, the first magnetic shielding tube is sleeved on the outside of the drift tube, the second magnetic shielding tube is sleeved on the outside of the second magnetic shielding tube, the first flange is arranged at one end of the second magnetic shielding tube, the second flange is fitted with the first flange, multiple first bolts respectively pass through the second flange and are respectively threadedly connected to the first flange, the eTOF pipe is arranged on one side of the second flange, the electrostatic lens assembly is arranged inside the eTOF pipe, the copper mesh is arranged inside the eTOF pipe, the nose is arranged at one end of the eTOF pipe, and the mounting assembly is arranged on the outside of the second magnetic shielding tube.

2. The electron time-of-flight spectrometer according to claim 1, wherein The mounting assembly includes a third flange and a plurality of second bolts. The third flange is sleeved on the outside of the second magnetic shielding tube and fits with the tee. The plurality of second bolts respectively pass through the third flange and are respectively threadedly connected to the tee.

3. The electron time-of-flight spectrometer according to claim 2, wherein The electrostatic lens assembly includes an insulating plate, multiple first electrode sheets, multiple second electrode sheets, multiple groups of first fixing members and multiple groups of second fixing members. The insulating plate is arranged between the first flange and the second flange. The multiple first electrode sheets are arranged in sequence on one side of the insulating plate. The multiple groups of first fixing members respectively penetrate the multiple first electrode sheets. The multiple second electrode sheets are arranged in sequence on the side of the insulating plate away from the multiple first electrode sheets. The multiple groups of second fixing members respectively penetrate the multiple second electrode sheets.

4. The electron time-of-flight spectrometer according to claim 3, wherein Each group of the first fixing members includes a first insulating rod, a first insulating sheet and a first nut. The first insulating rod sequentially passes through a plurality of the first electrode sheets and the first insulating sheet. The first nut is threadedly connected to the first insulating rod.

5. The electron time-of-flight spectrometer according to claim 4, characterized in that Each set of the second fixing members includes a second insulating rod, a second insulating sheet and a second nut. The second insulating rod sequentially passes through a plurality of second electrode sheets and the second insulating sheet. The second nut is threadedly connected to the first insulating rod.

6. The electron time-of-flight spectrometer according to claim 5, characterized in that The first magnetic shielding tube has a plurality of first circular holes, and the second magnetic shielding tube has a plurality of second circular holes.

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