A device for detecting illicit chemicals in air

Abstract

The application discloses a device for on-site detection of easily-made toxic chemicals in air. Miniaturized mass spectrometry combined with a micro six-pole focusing instrument improves the sensitivity of the instrument, and can realize on-site rapid detection of easily-made toxic chemicals in air. The opening and closing of a sampling pump realize rapid switching of a single-photon ionization source mode and a proton transfer reaction ionization source mode, broaden the detection range of the instrument, and are helpful to the search and investigation of illegal storage of easily-made toxic chemicals and drug-making dens.

Description

Technical Field

[0001] This invention relates to the field of precursor chemical detection, specifically a field detection device for precursor chemicals in the air. This device can rapidly switch between single-photon ionization source mode and proton transfer reaction ionization source mode by turning the sampling pump on and off, thus broadening the instrument's application range. The miniaturized mass spectrometer combined with a micro hexapole focusing system enhances the instrument's sensitivity, enabling rapid field detection of precursor chemicals in the air, which is helpful in the investigation and crackdown on illegal precursor chemical storage sites and drug manufacturing sites. Background Technology

[0002] Precursor chemicals are raw materials used to manufacture synthetic drugs. Investigating the illegal transportation and storage of precursor chemicals and uncovering drug manufacturing sites are crucial. Due to the volatility of precursor chemicals, low concentrations of these chemicals are present in the air near illegal storage sites and drug manufacturing sites. Detecting these airborne precursor chemicals and drug synthesis intermediates helps in identifying such sites.

[0003] In 2017, Du Xiguang et al. proposed an impedance spectroscopy detection method and device for precursor chemicals, utilizing electrochemical methods to detect the liquid under test. Although this method is simple to operate, requires minimal skill from the tester, and is suitable for on-site testing, it can only detect suspected liquids and cannot detect precursor chemical components in the air. Summary of the Invention

[0004] This invention discloses an on-site detection device for precursor chemicals in the air. The device can rapidly switch between single-photon ionization source mode and proton transfer reaction ionization source mode by turning the sampling pump on and off, broadening the instrument's application range. The excellent focusing capability of the miniature hexapole enhances the instrument's sensitivity. The built-in standard spectral library enables rapid qualitative analysis of the sample, and the device is simple to operate, suitable for non-professionals. Its compact size makes it suitable for on-site operation.

[0005] The purpose of this invention is to provide an on-site detection device for easily manufactured toxic chemicals in the air.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A field detection device for precursor chemicals, characterized in that: It includes sample introduction area 8, ionization and transport area 14, and detection area 18; The sample injection area 8 includes a metal capillary tube 5 and a metal capillary tube 6. One end of the two metal capillary tubes intersects at the inlet end of the sample injection pipe 7 on the cavity, and the included angle between the axes of the two capillary tubes at the intersection is 60°-90°, and they are respectively at an angle of 30°-45° to the axis of the inlet end of the sample injection pipe 7. The other end of the metal capillary tube 5 is directly connected to the atmosphere, and the other end of the metal capillary tube 6 is connected to the atmosphere through a three-way valve 4. The third port of the three-way valve 4 is connected to the gas outlet of the bubbling bottle 3. The gas inlet of the bubbling bottle 3 is connected to the gas outlet of the sampling pump 1. The ionization and transport region includes a vacuum ultraviolet lamp 9, a repulsion electrode 10, a focusing electrode 11, and a hexadecimal bar 12; the repulsion electrode 10 and the focusing electrode 11 are both plate-shaped electrodes, which are arranged in parallel and spaced apart. The outlet end of the sample inlet pipe 7 faces the middle of the region between the repulsion electrode 10 and the focusing electrode 11, and the light emitted from the vacuum ultraviolet lamp 9 irradiates the region between the repulsion electrode 10 and the focusing electrode 11. The focusing electrode 11 has an ion passage in the middle, and a hexagonal bar 12 is provided on the side of the focusing electrode 11 away from the repulsion electrode. The detection zone 18 includes an ion trap mass analyzer 16 and a detector 17; the ionization and transport zone 14 is connected to the detection zone 18 via an open electrode 13. Ions generated between the repulsion electrode 10 and the focusing electrode 11 pass sequentially through the ion through-hole in the middle of the focusing electrode 11, the hexagon 12, and the open electrode 13 to the ion trap mass analyzer 16, and are then detected by the detector 17.

[0007] The perforated electrode 13 is a plate-shaped electrode with a frustum-shaped through hole in the middle; the ionization and transport region 1 and the detection region 18 are connected through the perforated electrode 13 to achieve vacuum differential.

[0008] The outlet end of the injection pipe 7 passes through the middle of the repulsion electrode 10 and the focusing electrode facing its right side; The repulsion electrode is parallel to the focusing electrode and is located to the left of the focusing electrode. The distance between the right end face 10 of the repulsion electrode and the left end face of the focusing electrode 11 is 5-7 mm. The vacuum ultraviolet lamp 9 is located above the repulsion electrode and the focusing electrode, and the axis of the light outlet of the vacuum ultraviolet lamp 9 is located at the midline between the right end face of the repulsion electrode 10 and the left end face of the focusing electrode 11. The distance between the left end face of the hexagon 12 and the right end face of the focusing electrode 11 is 0.5-1.5 mm. The six rod-shaped electrodes of the hexapole 12 have a diameter of 4.5 mm and a length of 25-35 mm.

[0009] The air inlet of the bubbling bottle 3 is connected to the sampling pump 1 through a PTFE tube 2. The liquid in the bubbling bottle 3 is water. In the proton transfer reaction ionization source mode, it enters the ionization and transport region 14 and is photoionized by the vacuum ultraviolet lamp 9 to generate hydrated protons. The hydrated protons and the analyte molecules undergo a radio frequency enhanced proton transfer reaction in the hexapole 12 region. The device can quickly switch between single-photon ionization source mode and proton transfer reaction ionization source mode. Specifically: when sampling pump 1 is off, metal capillary tube 5 and metal capillary tube 6 passively draw in air for sampling due to the pressure difference between the ionization and transport region 14 and atmospheric pressure. At this time, the ionization source mode is single-photon ionization source. When sampling pump is on and the pumping speed is greater than the inlet air flow rate of the device, the sampling pump draws air into the bubbling bottle 3, metal capillary tube 5 draws air, and metal capillary tube 6 draws water into the ionization region to generate hydrated protons and undergo a proton transfer reaction. At this time, the ionization source mode is proton transfer reaction ionization source.

[0010] Voltages V1 and V2 are applied between the repulsion electrode 10 and the focusing electrode 11, with V1 being greater than V2. The electric fields of the repulsion electrode and the focusing electrode are used to reduce the positive and negative ion recombination reaction between photoelectrons and product ions.

[0011] The ionization and transport region also includes a hollow cavity in which the vacuum ultraviolet lamp 9, the repulsion electrode 10, the focusing electrode 11, and the hexagon 12 are all placed; the metal capillary tube 1 5 and the metal capillary tube 2 6 are fixed on the cavity of the ionization and transport region 14. A circular through hole is provided on the side wall of the cavity; the through hole electrode 13 is placed in the through hole, and the four edges of the through hole electrode 13 are sealed to the inner wall of the circular through hole of the cavity, or the through hole electrode 13 is placed on the side wall of the cavity, and the left or right surface of the through hole electrode 13 is sealed to the outer or inner wall of the right side wall of the ionization source cavity, and the projection of the through hole in the middle of the through hole of the through hole on the side wall of the cavity is located in the through hole on the right side wall of the cavity; The temperature of the metal capillary tube 5 and the metal capillary tube 6 is maintained at 80-160℃. As the temperature increases, the gas pressure in the ionization and transport region increases, the molecular number density of the sample to be tested increases, the number of ions generated by photoionization increases, and the increase in gas pressure is beneficial to improving the hexapole transport efficiency and the sensitivity of the instrument.

[0012] The device also includes a control system 21, which is a tablet computer. The control system 21 controls the voltage of the vacuum ultraviolet lamp 9, repulsion electrode 10, focusing electrode 11, hexapole 12, aperture electrode 13, lens electrode 15, ion trap mass analyzer 16, and detector 17 through mass spectrometry software, and controls the ion trap mass analyzer 16 to perform analysis. The mass spectrometry software has a built-in mass spectrometry library of common precursor chemicals, including one or more of toluene, acetone, phenylacetone, chloroform, acetic anhydride, diethyl ether, and 3,4-methylenedioxyphenyl-2-propanone.

[0013] The frequency of the hexapole 12 is 1-2.4MHz, and the peak-to-peak value of the radio frequency is adjustable between 160-400V.

[0014] The pumping speed of the sampling pump is adjustable from 100ml / min to 500ml / min.

[0015] The ion trap mass analyzer is a rectangular ion trap or a linear ion trap, and the detector is an electron multiplier or a Faraday disk.

[0016] (1) The outstanding advantage of this invention is that by controlling the opening and closing of the sampling pump, the single-photon ionization source mode and the proton transfer reaction ionization source mode can be quickly switched, thus broadening the application range of the instrument.

[0017] (2) This invention uses hydrated protons as reacting ions and avoids space charge effects by utilizing the mass discrimination effect of ion trap mass spectrometry. A miniature hexapole (30mm in length, 4.5mm in diameter) is used for ion transport in the miniature ion trap mass spectrometry, improving the instrument's sensitivity. This enables rapid on-site detection of precursor chemicals in the air, aiding in the investigation and crackdown on illegal storage sites and drug manufacturing sites.

[0018] (3) The present invention heats the capillary, which not only reduces the adsorption residue of the sample on the inner wall of the capillary, but also increases the gas pressure in the ionization and transport zone, which is beneficial to improving the ion production of photoionization and the transport efficiency of the micro hexapole. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 Mass spectra measured by devices at different distances in a simulated scenario. Detailed Implementation

[0020] Figure 1 This is a schematic diagram of the structure of the present invention; The sample introduction area is defined as follows: 8 is the sample introduction area, including 1 is the sampling pump, 2 is the PTFE tubing, 3 is the bubble bottle, 4 is the three-way valve, 5 is the first metal capillary tube, 6 is the second metal capillary tube, and 7 is the sample introduction tubing; 14 is the ionization and transport area, including 9 is the vacuum UV lamp, 10 is the repulsion electrode, 11 is the focusing electrode, and 12 is the hexapole; 18 is the detection area, including 15 is the lens electrode, 16 is the ion trap mass analyzer, 17 is the detector, and 13 is the open electrode connection; 19 is the mechanical pump, 20 is the molecular pump; and 21 is the control system. Example 1

[0021] The sample injection area 8 includes a metal capillary tube 5 and a metal capillary tube 6. One end of the two metal capillary tubes intersects at the inlet end of the sample injection pipe 7 on the cavity, and the included angle between the axes of the two capillary tubes at the intersection is 90°, and they are respectively at a 45° angle to the axis of the inlet end of the sample injection pipe 7. The other end of the metal capillary tube 5 is directly connected to the atmosphere, and the other end of the metal capillary tube 6 is connected to the atmosphere through a three-way valve 4. The third port of the three-way valve 4 is connected to the gas outlet of the bubbling bottle 3. The gas inlet of the bubbling bottle 3 is connected to the gas outlet of the sampling pump 1. The ionization and transport region 14 includes a vacuum ultraviolet lamp 9, a repulsion electrode 10, a focusing electrode 11, and a hexadecimal bar 12; the repulsion electrode 10 and the focusing electrode 11 are both plate-shaped electrodes, which are arranged in parallel and spaced apart. The outlet end of the sample inlet pipe 7 faces the middle of the region between the repulsion electrode 10 and the focusing electrode 11, and the light emitted from the vacuum ultraviolet lamp 9 irradiates the region between the repulsion electrode 10 and the focusing electrode 11. The focusing electrode 11 has an ion passage in the middle, and a hexagonal bar 12 is provided on the side of the focusing electrode 11 away from the repulsion electrode. Detection zone 18 includes ion trap mass analyzer 16 and detector 17; ionization and transport zone 14 is connected to detection zone 18 via open electrode 13; Ions generated between the repulsion electrode 10 and the focusing electrode 11 pass sequentially through the ion through-hole in the middle of the focusing electrode 11, the hexagon 12, and the open electrode 13 to the ion trap mass analyzer 16, and are then detected by the detector 17.

[0022] The perforated electrode 13 is a plate-shaped electrode with a frustum-shaped through hole in the middle; the ionization and transport region 1 and the detection region 18 are connected through the perforated electrode 13 to achieve vacuum differential.

[0023] The outlet end of the injection pipe 7 passes through the middle of the repulsion electrode 10 and the focusing electrode facing its right side; The repulsion electrode is parallel to the focusing electrode, and the repulsion electrode is located to the left of the focusing electrode. The distance between the right end face 10 of the repulsion electrode and the left end face of the focusing electrode 11 is 6mm. The vacuum ultraviolet lamp 9 is located above the repulsion electrode and the focusing electrode, and the axis of the light outlet of the vacuum ultraviolet lamp 9 is located at the midline between the right end face of the repulsion electrode 10 and the left end face of the focusing electrode 11. The distance between the left end face of the hexagon 12 and the right end face of the focusing electrode 11 is 1mm. The six rod-shaped electrodes of the hexapole 12 have a diameter of 4.5 mm and a length of 30 mm.

[0024] The air inlet of the bubbling bottle 3 is connected to the sampling pump 1 through a PTFE tube 2. The liquid in the bubbling bottle 3 is water. In the proton transfer reaction ionization source mode, it enters the ionization and transport region 14 and is photoionized by the vacuum ultraviolet lamp 9 to generate hydrated protons. The hydrated protons and the analyte molecules undergo a radio frequency enhanced proton transfer reaction in the hexapole 12 region. The device can quickly switch between single-photon ionization source mode and proton transfer reaction ionization source mode. Specifically: when sampling pump 1 is off, metal capillary tube 5 and metal capillary tube 6 passively draw in air for sampling due to the pressure difference between the ionization and transport region 14 and atmospheric pressure. At this time, the ionization source mode is single-photon ionization source. When sampling pump is on and the pumping speed is greater than the inlet air flow rate of the device, the sampling pump draws air into the bubbling bottle 3, metal capillary tube 5 draws air, and metal capillary tube 6 draws water into the ionization region to generate hydrated protons and undergo a proton transfer reaction. At this time, the ionization source mode is proton transfer reaction ionization source.

[0025] Voltages V1 and V2 are applied between the repulsion electrode 10 and the focusing electrode 11, with V1 being greater than V2. The electric fields of the repulsion electrode and the focusing electrode are used to reduce the recombination reaction between photoelectrons and product ions.

[0026] The ionization and transport region also includes a hollow cavity in which the vacuum ultraviolet lamp 9, the repulsion electrode 10, the focusing electrode 11, and the hexapole 12 are all placed; metal capillary tube 1 5 and metal capillary tube 2 6 are fixed on the cavity of the ionization and transport region 14. A circular through hole is provided on the side wall of the cavity; the through hole electrode 13 is placed in the through hole, and the four edges of the through hole electrode 13 are sealed to the inner wall of the circular through hole of the cavity, or the through hole electrode 13 is placed on the side wall of the cavity, and the left or right surface of the through hole electrode 13 is sealed to the outer or inner wall of the right side wall of the ionization source cavity, and the projection of the through hole in the middle of the through hole of the through hole on the side wall of the cavity is located in the through hole on the right side wall of the cavity; The temperature of metal capillary tube 5 and metal capillary tube 6 is maintained at 120℃. As the temperature increases, the gas pressure in the ionization and transport region increases, the molecular number density of the sample to be tested increases, the number of ions generated by photoionization increases, and the increase in gas pressure is beneficial to improving the transmission efficiency of the hexapole and thus improving the sensitivity of the instrument.

[0027] The device also includes a control system 21, which is a tablet computer that controls the instrument via mass spectrometry software. The mass spectrometry software connects to the instrument's main control board via Wi-Fi and controls the voltage of the vacuum UV lamp 9, repulsion electrode 10, focusing electrode 11, hexapole 12, aperture electrode 13, lens electrode 15, ion trap mass analyzer 16, and detector 17 by controlling the switches of each port and issuing voltage commands, thereby controlling the ion trap mass analyzer 16 to perform analysis. The mass spectrometry software has a built-in mass spectrometry library of common precursor chemicals, including toluene, acetone, phenylacetone, chloroform, and acetic anhydride.

[0028] The hexapole 12 has a frequency of 2.4MHz and a peak-to-peak RF voltage of 400V.

[0029] The sampling pump has a pumping speed of 150 ml / min.

[0030] The ion trap mass analyzer is a rectangular ion trap or a linear ion trap, and the detector is an electron multiplier or a Faraday disk.

[0031] The simulation scenario was set as follows: The experiment was conducted in a laboratory with no other personnel present, and all participants wore protective masks. Before the experiment, background gas samples were collected to eliminate interference. Two open containers, containing 2 ml of toluene and 2 ml of acetone respectively, were placed at distances of 4 m, 6 m, and 8 m from the mass spectrometer sampling port. The scenario was constructed using a single-photon ionization source to assess the detection capability of easily manufactured toxic chemicals in the air. The sampling pump was turned off, and metal capillary tubes 5 and 6 passively absorbed gas for sampling due to the pressure difference between the ionization and transport region 14 and atmospheric pressure. Voltage parameters were loaded using the mass spectrometry software, the vacuum UV lamp was turned on, and the mass spectrometer, consisting of the sample introduction region, ionization and transport region, and detection region, was started for detection. Spectral changes were observed, and the sample diffusion was considered to have reached equilibrium when the sample signal intensity remained constant at different distances. After the experiment, the laboratory windows were opened to rapidly reduce the concentrations of toluene and acetone in the room. The experimental intervals at 4 m, 6 m, and 8 m were 2 hours. Each experiment was performed in parallel five times, and background gas samples were collected before each experiment. Abnormal toluene concentration was used as an early warning indicator; phenylacetone is a raw material for methamphetamine production; the presence of phenylacetone confirmed the presence of a drug manufacturing site. Concentration variation data with distance is shown below. Figure 2 As shown, abnormal toluene concentration in the air can be detected at a distance of 8m, and phenylacetone can be detected in the air at a distance of 6m, verifying the device's ability to detect precursor chemicals in the air on-site.

Claims

1. A field detection device for easily manufactured toxic chemicals in the air, characterized in that: Includes sample introduction area (8), ionization and transport area (14), and detection area (18); The sample injection area (8) includes a metal capillary tube one (5) and a metal capillary tube two (6). One end of the two metal capillary tubes intersects at the inlet end of the sample injection pipe (7) on the cavity, and the included angle between the axes of the two capillary tubes at the intersection is 60°-90°, and they are respectively at an angle of 30°-45° to the axis of the inlet end of the sample injection pipe (7). The other end of the metal capillary tube one (5) is directly connected to the atmosphere, and the other end of the metal capillary tube two (6) is connected to the atmosphere through a three-way valve (4). The third port of the three-way valve (4) is connected to the gas outlet of the bubbling bottle (3). The air inlet of the bubbling bottle (3) is connected to the air outlet of the sampling pump (1). The ionization and transport region includes a vacuum ultraviolet lamp (9), a repulsion electrode (10), a focusing electrode (11), and a hexapole (12); the repulsion electrode (10) and the focusing electrode (11) are both plate-shaped electrodes, which are arranged in parallel and spaced apart. The outlet end of the sample inlet pipe (7) faces the middle of the region between the repulsion electrode (10) and the focusing electrode (11), and the light emitted from the vacuum ultraviolet lamp (9) irradiates the region between the repulsion electrode (10) and the focusing electrode (11). The focusing electrode (11) has an ion passage in the middle and a hexagon (12) is provided on the side of the focusing electrode (11) away from the repulsion electrode. The detection zone (18) includes an ion trap mass analyzer (16) and a detector (17); the ionization and transport zone (14) and the detection zone (18) are connected by an open electrode (13); Ions generated between the repulsion electrode (10) and the focusing electrode (11) pass sequentially through the ion through-hole in the middle of the focusing electrode (11), the hexagon (12), and the open electrode (13) to the ion trap mass analyzer (16) and are then detected by the detector (17). The inlet of the bubbling bottle (3) is connected to the sampling pump (1) through a PTFE tube (2). The liquid in the bubbling bottle (3) is water. In the proton transfer reaction ionization source mode, it enters the ionization and transport region (14) and is photoionized by the vacuum ultraviolet lamp (9) to generate hydrated protons. The hydrated protons and the analyte molecules undergo a radio frequency enhanced proton transfer reaction in the hexapole (12) region. The device can quickly switch between single-photon ionization source mode and proton transfer reaction ionization source mode. Specifically: when the sampling pump (1) is off, metal capillary tube one (5) and metal capillary tube two (6) passively draw in air for sampling due to the pressure difference between the ionization and transport region (14) and atmospheric pressure. At this time, the ionization source mode is single-photon ionization source. When the sampling pump is on and the pumping speed is greater than the inlet air flow rate of the device, the sampling pump draws air into the bubble bottle (3), metal capillary tube one (5) draws air, and metal capillary tube two (6) draws water into the ionization region to generate hydrated protons and undergo proton transfer reaction. At this time, the ionization source mode is proton transfer reaction ionization source.

2. The apparatus according to claim 1, characterized in that: The perforated electrode (13) is a plate-shaped electrode with a frustum-shaped through hole in the middle; the ionization and transport region (14) and the detection region (18) are connected through the perforated electrode (13) to achieve vacuum differential.

3. The apparatus according to claim 1, characterized in that: The outlet end of the injection pipe (7) passes through the middle of the repulsion electrode (10) and the focusing electrode facing its right side; The repulsion electrode is parallel to the focusing electrode. The repulsion electrode is located to the left of the focusing electrode. The distance between the right end face of the repulsion electrode (10) and the left end face of the focusing electrode (11) is 5-7 mm. The vacuum ultraviolet lamp (9) is located above the repulsion electrode and the focusing electrode. The light outlet axis of the vacuum ultraviolet lamp (9) is located at the midline between the right end face of the repulsion electrode (10) and the left end face of the focusing electrode (11). The distance between the left end face of the hexagon (12) and the right end face of the focusing electrode (11) is 0.5-1.5 mm. The six rod-shaped electrodes (12) have a diameter of 4.5 mm and a length of 25-35 mm.

4. The apparatus according to claim 1, characterized in that: Voltages V1 and V2 are applied between the repulsion electrode (10) and the focusing electrode (11), with V1 being greater than V2, to reduce the positive and negative ion recombination reaction between photoelectrons and product ions by utilizing the electric fields of the repulsion electrode and the focusing electrode.

5. The apparatus according to claim 1, characterized in that: The ionization and transport region also includes a hollow cavity in which a vacuum ultraviolet lamp (9), a repulsion electrode (10), a focusing electrode (11), and a hexagon (12) are placed; metal capillary tube one (5) and metal capillary tube two (6) are fixed on the cavity of the ionization and transport region (14); A circular through hole is provided on the side wall of the cavity; the through hole electrode (13) is placed in the through hole, and the four edges of the through hole electrode (13) are sealed to the inner wall of the circular through hole of the cavity, or the through hole electrode (13) is placed on the side wall of the cavity, and the left or right surface of the through hole electrode (13) is sealed to the outer or inner wall of the right side wall of the ionization source cavity, and the projection of the through hole in the middle of the through hole of the through hole on the side wall of the cavity is located in the through hole on the right side wall of the cavity; The temperature of the first metal capillary tube (5) and the second metal capillary tube (6) is maintained at 80-160℃. As the temperature increases, the gas pressure in the ionization and transmission zone increases, the molecular density of the sample to be tested increases, the number of ions generated by photoionization increases, and the increase in gas pressure is beneficial to improving the transmission efficiency of the hexapole and improving the sensitivity of the instrument.

6. The apparatus according to claim 1, characterized in that: The device also includes a control system (21), which is a tablet computer. The control system (21) controls the voltage of the vacuum ultraviolet lamp (9), repulsion electrode (10), focusing electrode (11), hexapole (12), aperture electrode (13), lens electrode (15), ion trap mass analyzer (16), and detector (17) through mass spectrometry software, and controls the ion trap mass analyzer (16) to perform analysis. The mass spectrometry software has a built-in library of common precursor chemical mass spectrometry, including one or more of toluene, acetone, phenylacetone, chloroform, acetic anhydride, diethyl ether, and 3,4-methylenedioxyphenyl-2-propanone.

7. The apparatus according to claim 1, characterized in that: The frequency of the hexagon (12) is 1-2.4MHz, and the peak-to-peak value of the radio frequency is adjustable between 160-400V.

8. The apparatus according to claim 1, characterized in that: The pumping speed of the sampling pump is adjustable from 100ml / min to 500ml / min.

9. The apparatus according to claim 1, characterized in that: The ion trap mass analyzer is a rectangular ion trap or a linear ion trap, and the detector is an electron multiplier or a Faraday disk.

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