WO2022239243A1 - 質量分析装置 - Google Patents
質量分析装置 Download PDFInfo
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- WO2022239243A1 WO2022239243A1 PCT/JP2021/018471 JP2021018471W WO2022239243A1 WO 2022239243 A1 WO2022239243 A1 WO 2022239243A1 JP 2021018471 W JP2021018471 W JP 2021018471W WO 2022239243 A1 WO2022239243 A1 WO 2022239243A1
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- 238000004949 mass spectrometry Methods 0.000 title abstract description 6
- 150000002500 ions Chemical class 0.000 claims abstract description 214
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- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
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- 150000001793 charged compounds Chemical class 0.000 description 1
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- 238000001514 detection method Methods 0.000 description 1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J49/00—Particle spectrometers or separator tubes
- H01J49/02—Details
- H01J49/10—Ion sources; Ion guns
- H01J49/14—Ion sources; Ion guns using particle bombardment, e.g. ionisation chambers
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J49/00—Particle spectrometers or separator tubes
- H01J49/26—Mass spectrometers or separator tubes
- H01J49/34—Dynamic spectrometers
- H01J49/42—Stability-of-path spectrometers, e.g. monopole, quadrupole, multipole, farvitrons
Definitions
- the present invention relates to a mass spectrometer, and more specifically, an ion source using an ionization method such as an electron ionization (EI) method, a chemical ionization (CI) method, or a negative chemical ionization (NCI) method. It relates to a mass spectrometer equipped with.
- EI electron ionization
- CI chemical ionization
- NCI negative chemical ionization
- a mass spectrometer equipped with an ion source based on an ionization method such as the EI method, CI method, or NCI method is used.
- the mass spectrometer described in Patent Document 1 is a mass spectrometer equipped with an EI ion source.
- the EI ion source has a box-shaped ionization chamber.
- An electron inlet is formed on one of the opposing walls of the ionization chamber, and an electron outlet is formed on the other.
- the filament heats up and generates thermal electrons.
- the thermal electrons are accelerated by the electric field, enter the ionization chamber through the electron inlet, and travel toward the trap electrode located outside the electron outlet. This creates a thermionic current that passes through the ionization chamber. Gaseous sample molecules supplied into the ionization chamber come into contact with thermal electrons and are ionized by interaction with the thermal electrons.
- a pair of magnets are arranged on the outside of the filament and the trap electrode so as to sandwich them, and these magnets form a magnetic field having magnetic lines of force in a direction parallel to the thermionic current in the ionization chamber.
- Thermoelectrons receive the Lorentz force from the magnetic field and travel spirally around the lines of magnetic force. This suppresses the expansion of the thermoelectron flow, increases the chances of contact between the thermoelectrons and the sample molecules, and increases the ionization efficiency.
- the sample molecular ions generated in the ionization chamber as described above are ionized by an electric field formed by one or both of the extraction electrode arranged outside the ionization chamber and the repeller electrode arranged inside the ionization chamber. It is pulled out from the inside of the ionization chamber to the outside through the outlet.
- the extracted ions are introduced into a mass separator such as a quadrupole mass filter through an ion transport optical system, and the mass-to-charge ratio (strictly speaking, italicized “m/z", but in this specification, " are separated and detected according to their mass-to-charge ratio" or "m/z").
- the above mass spectrometer is often used in combination with a gas chromatograph as a gas chromatograph-mass spectrometer (GC-MS).
- a gas chromatograph-mass spectrometer GC-MS
- helium is often used as the carrier gas for gas chromatographs, and the lower limit of the measurement mass-to-charge ratio range is the mass of helium ions so that a large amount of helium ions generated by the ion source do not enter the ion detector. higher than the charge ratio.
- the sample is introduced directly into the mass spectrometer without using a gas chromatograph, and ions derived from sample molecules such as hydrogen and helium contained in the sample, or hydrogen ions generated by fragmentation, There is also a strong demand from users to quantify ions with a low mass-to-charge ratio with high sensitivity.
- this type of mass spectrometer is generally used as a GC-MS, in which case ions with very low mass-to-charge ratios are not observed, so such ions can be detected with high sensitivity. It cannot be said that sufficient consideration has been given to the analysis by
- the present invention has been made in order to solve these problems.
- a mass spectrometer equipped with an ion source that utilizes thermal electrons for ionization such as an EI ion source
- high analysis of ions with a particularly low mass-to-charge ratio is possible. Its purpose is to achieve sensitivity.
- a mass spectrometer equipped with an ion source that ionizes components contained in a sample gas, the ion source comprising: an ionization chamber having an ion exit and forming a space inside thereof substantially separated from the outside; a thermionic supply unit that supplies thermionic electrons to the inside of the ionization chamber; a magnetic field generator for forming a magnetic field inside the ionization chamber for spirally turning the thermoelectrons; Direct or indirect action of the thermoelectrons deflects the ions originating from the sample component generated in the ionization chamber in a direction against the force received from the magnetic field when the ions are directed toward the ion exit port. a deflection electric field forming part for forming a deflection electric field in the ionization chamber; Prepare.
- the magnetic field formed in the ionization chamber has the effect of suppressing the expansion of the thermionic current.
- the track will be curved.
- the bending of ion trajectories due to the influence of such a magnetic field can be one of the major causes of ion loss.
- the electric field generated by the deflection electric field generator corrects the bending of the trajectory caused by the force of the magnetic field applied to the ions generated in the ionization chamber. be able to.
- the loss of ions generated in the ionization chamber when extracted from the ionization chamber to the outside can be suppressed, and the extraction efficiency of ions can be improved.
- a larger amount of ions can be subjected to mass spectrometry, and high analytical sensitivity can be achieved.
- FIG. 1 is an overall configuration diagram of a mass spectrometer that is an embodiment of the present invention
- FIG. Schematic vertical end view (A) and schematic horizontal end view (B) of an ion source in the mass spectrometer of the present embodiment.
- Simulation results of ion trajectories inside the ionization chamber (m/z 100, with thermionic focusing magnetic field, no ion deflection electric field). Simulated ion trajectories inside the ionization chamber (m/z 2, with thermionic focusing field, and continuous ion deflection electric field). Simulation results for ion trajectories inside the ionization chamber (m/z 4, with thermionic focusing field, and continuous ion deflection electric field). Simulated ion trajectory inside the ionization chamber (m/z 100, with thermionic focusing field, continuous ion deflection electric field).
- Simulation results for ion trajectories inside the ionization chamber (m/z 2, with thermionic focusing magnetic field, and pulsed ion deflection electric field). Simulation results for ion trajectories inside the ionization chamber (m/z 4, with thermionic focusing magnetic field, and pulsed ion deflection electric field). Simulation results of ion trajectories inside the ionization chamber (m/z 100, with thermionic focusing magnetic field, with pulsed ion deflection electric field). Figure showing simulation results of temporal changes in ion position inside the ionization chamber (m/z 2, with magnetic field for thermionic focusing, with electric field for ion deflection).
- FIG. 4 is a schematic diagram showing the timing of mass scanning and deflection electric field formation in the mass spectrometer of the present embodiment.
- FIG. 4 is an explanatory diagram of the timing of forming a deflection electric field in another form of mass spectrometer.
- FIG. 10 is a schematic lateral end view of an EI ion source in a modified mass spectrometer;
- FIG. 11 is a schematic lateral end view of an EI ion source in a mass spectrometer of another modified example;
- the ion source performs ionization using thermal electrons, and specifically is an ion source according to, for example, the EI method, the CI method, or the NCI method.
- the method and mode of mass separation are not limited to a specific one.
- a mass spectrometer having a region for dissociating ions such as a collision cell or an ion trap and capable of performing MS/MS analysis or MS n analysis (where n is an integer of 3 or more) may be used.
- FIG. 1 is an overall configuration diagram of a mass spectrometer according to this embodiment.
- FIG. 2 is a schematic vertical end view (A) and a schematic horizontal end view (B) of the ion source in the mass spectrometer of this embodiment.
- This mass spectrometer is a single quadrupole mass spectrometer.
- FIGS. 1 and 2 three axes of X, Y and Z which are orthogonal to each other are defined.
- the mass spectrometer of the present embodiment includes an EI ion source 3, an ion transport optical system 4, and an ion transport optical system 4 arranged along an ion optical axis C inside a chamber 1 evacuated by a vacuum pump (not shown).
- a quadrupole mass filter 5 and an ion detector 6 are provided.
- the ion optical axis C is parallel to the Z-axis direction.
- the EI ion source 3 includes an ionization chamber 30 which has a substantially rectangular parallelepiped outer shape and is made of a conductive material such as metal.
- An ion exit port 301, an electron introduction port 302, and an electron exit port 303 are formed in the side wall, upper wall, and lower wall of the ionization chamber 30, respectively.
- a repeller electrode 31 is arranged inside the ionization chamber 30 , a filament 32 is arranged outside the electron inlet 302 , and a trap electrode 33 is arranged outside the electron outlet 303 .
- a pair of magnets 34 and 35 are arranged above and below the filament 32 and the trap electrode 33 so as to sandwich the filament 32 and the trap electrode 33.
- two extraction electrodes 36A each having an ion passage opening are formed outside the ion ejection port 301.
- 36B (together referred to as 36) are arranged.
- a deflection electrode 37 is arranged inside the ionization chamber 30 , and a sample gas introduction pipe 304 is connected to the side wall of the ionization chamber 30 .
- the ionization chamber 30 is grounded and its potential is 0V.
- a predetermined DC voltage Vd is applied to the deflection electrode 37 from the deflection voltage generator 7 .
- a deflection voltage generator 7 is controlled by a controller 9 together with a quadrupole voltage generator 8 that applies a voltage to each electrode of the quadrupole mass filter 5 .
- the mass spectrometer also includes a voltage generator that applies predetermined voltages to the filament 32, the trap electrode 33, the extraction electrode 36, the ion transport optical system 4, and the like.
- FIG. 1 the operation of mass spectrometry performed in the mass spectrometer of this embodiment will be described with reference to FIGS. 1 and 2.
- FIG. 1 the operation of mass spectrometry performed in the mass spectrometer of this embodiment will be described with reference to FIGS. 1 and 2.
- a sample gas is introduced into the ionization chamber 30 through a sample gas introduction pipe 304 from, for example, a direct sample introduction device.
- An electric current is supplied to the filament 32, which heats the filament 32 and produces thermoelectrons.
- Voltages applied to the filament 32 and the trap electrode 33 form a predetermined potential difference between them, and the thermoelectrons are accelerated by the potential difference and travel toward the trap electrode 33 . That is, as shown in FIG. 2A, a thermoelectron flow is formed passing through the ionization chamber 30 from the filament 32 toward the trap electrode 33, that is, traveling in the negative direction of the Y-axis.
- a pair of magnets 34, 35 create a magnetic field within the ionization chamber 30 that describes flux lines parallel to the thermionic current. Each thermoelectron flies in a helical circle around this magnetic flux line. This suppresses the expansion of the thermionic current in the X-axis direction and the Z-axis direction.
- the sample molecules contained in the sample gas are ionized by contact with thermal electrons.
- the pushing electric field formed in the ionization chamber 30 by the potential difference between the repeller electrode 31 and the inner wall of the ionization chamber 30 pushes the ions generated as described above approximately in the Z-axis direction, that is, toward the ion exit 301 . has a pushing action.
- a direct-current voltage having a polarity opposite to that of the ions is applied to the extraction electrode 36 , and the extraction electric field generated thereby reaches the interior of the ionization chamber 30 through the ion exit port 301 .
- This extraction electric field has the effect of attracting ions. Ions generated in the ionization chamber 30 are drawn out through the ion exit port 301 and introduced into the ion transport optical system 4 by the action of both the pushing electric field and the drawing electric field.
- the ions are once converged near the ion optical axis C and sent to the quadrupole mass filter 5.
- a predetermined voltage obtained by superimposing a high-frequency voltage (RF voltage) on a DC voltage is applied from a quadrupole voltage generator 8 to the four rod electrodes constituting the quadrupole mass filter 5, and a specific voltage corresponding to the voltage is applied. Only ions with a mass-to-charge ratio selectively pass through the quadrupole mass filter 5 .
- the ion detector 6 generates and outputs a detection signal corresponding to the amount of ions that have arrived.
- mass spectral data indicating the ion intensity in a predetermined mass-to-charge ratio range can be obtained.
- FIGS. 3 to 16 are diagrams showing simulation results of temporal changes in the position of ions in the Z-axis direction inside the ionization chamber 30.
- FIG. 13 to 16 are diagrams showing simulation results of temporal changes in the position of ions in the Z-axis direction inside the ionization chamber 30.
- a magnetic field is formed inside the ionization chamber 30 .
- the magnetic flux lines in the magnetic field are oriented in a direction perpendicular to the paper surface of FIGS.
- the Lorentz force due to this magnetic field acts not only on thermal electrons but also on various ions generated inside the ionization chamber 30 .
- FIG. 3 shows m/z 2 when neither a magnetic field (denoted as “B” in FIGS. 3 to 16 ) nor a later-described deflection electric field (denoted as “EX” in FIGS. 3 to 16) are present. It is a simulation result of an ion trajectory.
- FIGS. 4-6 are respectively simulation results of ion trajectories at m/z 2, m/z 4, and m/z 100 in the presence of a magnetic field but no deflection electric field. 4 to 6 can be said to be ion trajectories in a general EI ion source.
- the ions generated in the central portion of the ionization chamber 30 travel toward the ion exit port 301 as a whole. Then, due to the effect of a convergent electric field formed near the ion passage opening of the extraction electrode 36A by the second extraction electrode 36B (not shown) located further right of the extraction electrode 36A visible in the figure, ions are It may be focused and pass through the ion passage aperture. This is normal and nearly ideal ion behavior.
- a predetermined voltage Vd having the same polarity as the ions is applied.
- a positive DC voltage is applied to the deflection electrode 37 to generate a deflection electric field that pushes the ions in the negative direction of the X axis as indicated by arrow A in FIG. , are formed in a part of the ionization chamber 30 .
- the curvature of the ion trajectory can also be corrected by creating an electric field that attracts the ions instead of one that pushes them.
- Figures 7 to 9 show the trajectories of ions at m/z 2, m/z 4, and m/z 100, respectively, in the presence of a magnetic field to form a deflecting electric field (with an electric field strength of 100 V/m). These are simulation results. 7 and 8, light ions of m/z 2 and m/z 4 have their trajectories corrected by the action of the deflection electric field, and the amount of ions passing through the ion passage aperture of the extraction electrode 36A clearly increases. I understand. On the other hand, as shown in FIG.
- the mass spectrometer of this embodiment generally performs analysis in either scan mode or selected ion monitoring (SIM) mode.
- FIG. 17 is a schematic diagram showing an example of the timing of mass scanning and deflection electric field formation in scan mode.
- the scanning range of mass scanning is, for example, m/z 1 to m/z 1000, and in the example shown in FIG. 17, scanning is repeatedly performed in the direction in which the mass-to-charge ratio increases.
- the quadrupole mass filter 5 is configured from the quadrupole voltage generator 8 so that ions of m/z 2 selectively pass through the quadrupole mass filter 5.
- a predetermined voltage is applied to the rod electrodes.
- the EI ion source 3 needs to correct the curvature of the ion trajectory due to the influence of the magnetic field.
- the control unit 9 applies a deflection voltage Vd to the deflection electrode 37 so as to form a deflection electric field in synchronization with the timing of selectively passing ions having a small mass-to-charge ratio in the quadrupole mass filter 5.
- the deflection voltage generator 7 is controlled.
- the period for forming the deflection electric field (the pulse width of the deflection voltage in FIG. 17) may be determined in advance according to the mass-to-charge ratio range of the ions for which it is necessary to correct the bending of the trajectory due to the influence of the magnetic field.
- ions generated by the EI ion source 3 are efficiently transferred into the ionization chamber 30 for ions with any mass-to-charge ratio from a low mass-to-charge ratio to a high mass-to-charge ratio when performing analysis in the scan mode. , and can be analyzed by the quadrupole mass filter 5. As a result, high analytical sensitivity can be achieved for any ion.
- the degree of improvement in analytical sensitivity can be increased by switching the value of the deflection voltage Vd not only in two values but in multiple steps.
- the mass spectrometer of the above embodiment uses a quadrupole mass filter as a mass separator, and only ions having a specific mass-to-charge ratio are measured at a given point in time, Control as described above is possible.
- a mass spectrometer using, for example, a sector magnetic field mass separator, an orthogonal acceleration time-of-flight mass separator, or the like as a mass separator ions entering the mass separator almost simultaneously are Therefore, the control as described above cannot be adopted. Therefore, in such a mass spectrometer, the following control should be performed.
- Figures 10-12 are m/z 2, m/z 4, and m/z 100 when a magnetic field is present and a deflecting electric field (with an electric field strength of 100 V/m) is formed for 2.0 us. It is a simulation result of an ion trajectory. As can be seen by comparing FIGS. 7 and 10, and between FIGS. 8 and 11, even when the period during which the deflecting electric field is acting is 2.0 us, the ion trajectory is sufficiently bent by the action of the magnetic field. Modified, nearly all ions can pass through the ion passage aperture. On the other hand, as can be seen by comparing FIG. 9 and FIG.
- FIGS. 13 to 16 are diagrams showing simulation results of temporal positional changes of ions inside the ionization chamber 30 when both a magnetic field and a deflection electric field are present.
- the horizontal axis indicates the position in the Z-axis direction
- the vertical axis indicates the time for ions to pass through the XY plane at each position on the Z-axis. Therefore, in these figures, the time at the position Z1 corresponding to the left surface of the extraction electrode 36A represents the time required for the ions generated near the center of the ionization chamber 30 to reach the left surface of the extraction electrode 36A.
- ions of m/z 2 and m/z 4 reach the left surface of the extraction electrode 36A within 1.5 us after being generated near the center of the ionization chamber 30.
- ions with m/z 100 require about 3 to 7 us from being generated near the center of the ionization chamber 30 to reaching the left surface of the extraction electrode 36A.
- ions of m/z 500 require about 8 to 15 us from being generated near the center of the ionization chamber 30 to reaching the left surface of the extraction electrode 36A.
- the ion with m/z 100-500 has moved only slightly in the Z-axis direction from its starting position when 2 us have passed since the ion was generated. , exists at a position with a sufficient distance to the ion exit.
- the controller 9 intermittently applies a deflection voltage to the deflection electrode 37 as shown in FIG. It is preferable to control the deflection voltage generator 7 so that the voltage is applied.
- ta is 2.0us as an example.
- tb may be appropriately determined according to the upper limit of the mass-to-charge ratio range of the object to be measured.
- this upper limit is m/z 500
- the measured mass-to-charge ratio range is, for example, m/z 1-500
- tb should be longer.
- tb should be shorter.
- the deflection electrode 37 for forming a deflection electric field in the ionization chamber 30 is arranged in the ionization chamber 30.
- the ionization chamber 30 is generally very small, and the ionization chamber 30 is very small. Adding new electrodes can be difficult.
- the configuration as shown in FIG. 19 or 20 may be employed. 19 and 20 are lateral end views of the ionization chamber 30, similar to FIG. 2(B).
- the ionization chamber 30 itself is divided into two (30A, 30B) in the X-axis direction, and the two partial ionization chambers 30A, 30B are connected via an insulating member 305 between them.
- One partial ionization chamber 30B is grounded, and the deflection voltage Vd is applied to the other partial ionization chamber 30A.
- Vd deflection voltage
- a hole is provided in the wall surface of the ionization chamber 30, and a rod-shaped deflection electrode 37B is inserted into the hole.
- a cylindrical insulating member 305 insulates between the deflection electrode 37B and the ionization chamber 30 .
- power supply is easier than in the configuration shown in FIG. With such a configuration, it is also possible to form a deflection electric field similar to that of the above embodiment.
- the mass spectrometer of the above embodiment uses an EI ion source, but any ion source that performs ionization using thermoelectrons and uses a magnetic field to focus the thermoelectrons may be used. Therefore, the present invention can also be applied to a mass spectrometer using a CI ion source or an NCI ion source, for example.
- the configurations other than the ion source are not limited to those described in the above embodiments, and can be changed as appropriate. Therefore, the mass spectrometer according to the present invention is not limited to a single-type quadrupole mass spectrometer, but may be a time-of-flight mass spectrometer, an ion trap mass spectrometer, a triple quadrupole mass spectrometer, a sector magnetic field type Naturally, it can be applied to various types of mass spectrometers such as mass spectrometers and ion mobility-mass spectrometers.
- One aspect of the mass spectrometer according to the present invention is a mass spectrometer equipped with an ion source that ionizes components contained in a sample gas, the ion source comprising: an ionization chamber having an ion exit and forming a space inside thereof substantially separated from the outside; a thermionic supply unit that supplies thermionic electrons to the inside of the ionization chamber; a magnetic field generator for forming a magnetic field inside the ionization chamber for spirally turning the thermoelectrons; Direct or indirect action of the thermoelectrons deflects the ions originating from the sample component generated in the ionization chamber in a direction against the force received from the magnetic field when the ions are directed toward the ion exit port. a deflection electric field forming part for forming a deflection electric field in the ionization chamber; Prepare.
- thermoelectrons supplied into the ionization chamber by the thermoelectron supply unit advance while spirally turning due to the action of the magnetic field formed by the magnetic field generation unit.
- the magnetic field has the effect of suppressing the spread of the thermoelectron current, but ions with a low mass-to-charge ratio are also affected by the magnetic field, and their trajectories are bent when heading toward the ion exit.
- the action of the electric field formed by the deflection electric field generator corrects the bending of the trajectory caused by the force of the magnetic field applied to the ions generated in the ionization chamber.
- the loss of ions generated in the ionization chamber when extracted from the ionization chamber to the outside can be suppressed, and the extraction efficiency of ions can be improved.
- a larger amount of ions can be subjected to mass spectrometry, and analytical sensitivity can be improved.
- a deflection electric field with a predetermined electric field strength may be continuously formed, but in that case, the ions are hardly affected by the magnetic field. Conversely, heavy ions may have their trajectories bent under the influence of the deflection electric field, resulting in ion loss.
- the deflection electric field generator includes electrodes arranged inside the ionization chamber or as part of the inner wall of the ionization chamber, and intermittent electrodes between the electrodes. and a voltage generator that applies a voltage to the substrate.
- the mass spectrometer according to Section 1 has a quadrupole mass filter as a mass separator, and according to the mass-to-charge ratio of ions selectively passing through the quadrupole mass filter, , and a control unit that adjusts the timing of forming the deflection electric field.
- the light ions are ions at the same timing as the light ions pass through the quadrupole mass filter.
- a deflection electric field may be created as it emanates from the source. That is, the scanning of the voltage applied to the electrodes constituting the quadrupole mass filter is synchronized with the timing of forming the deflection electric field in the ionization chamber.
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Abstract
Description
イオン射出口を有し、その内部に外部とは略区画された空間を形成するイオン化室と、
前記イオン化室の内部に熱電子を供給する熱電子供給部と、
前記熱電子を螺旋状に旋回させるために前記イオン化室の内部に磁場を形成する磁場形成部と、
前記熱電子の直接的な又は間接的な作用により前記イオン化室内で生成された試料成分由来のイオンが前記イオン射出口に向かう際に、前記磁場から受ける力に抗する方向に該イオンを偏向させる偏向電場を該イオン化室内に形成する偏向電場形成部と、
を備える。
図1は、本実施形態の質量分析装置の全体構成図である。図2は、本実施形態の質量分析装置におけるイオン源の概略縦端面図(A)及び概略横端面図(B)である。この質量分析装置はシングル四重極型質量分析装置である。なお、説明の都合上、図1及び図2中に示すように、互いに直交するX、Y、Zの3軸を定める。
上述した例示的な実施形態が以下の態様の具体例であることは、当業者には明らかである。
イオン射出口を有し、その内部に外部とは略区画された空間を形成するイオン化室と、
前記イオン化室の内部に熱電子を供給する熱電子供給部と、
前記熱電子を螺旋状に旋回させるために前記イオン化室の内部に磁場を形成する磁場形成部と、
前記熱電子の直接的な又は間接的な作用により前記イオン化室内で生成された試料成分由来のイオンが前記イオン射出口に向かう際に、前記磁場から受ける力に抗する方向に該イオンを偏向させる偏向電場を該イオン化室内に形成する偏向電場形成部と、
を備える。
3…EIイオン源
30…イオン化室
301…イオン射出口
302…電子導入口
303…電子排出口
304…試料ガス導入管
305…絶縁部材
30A、30B…部分イオン化室
31…リペラー電極
32…フィラメント
33…トラップ電極
34、35…磁石
36、36A…引出し電極
37、37B…偏向電極
4…イオン輸送光学系
5…四重極マスフィルター
6…イオン検出器
7…偏向電圧発生部
8…四重極電圧発生部
9…制御部
Claims (3)
- 試料ガスに含まれる成分をイオン化するイオン源を具備する質量分析装置であって、該イオン源は、
イオン射出口を有し、その内部に外部とは略区画された空間を形成するイオン化室と、
前記イオン化室の内部に熱電子を供給する熱電子供給部と、
前記熱電子を螺旋状に旋回させるために前記イオン化室の内部に磁場を形成する磁場形成部と、
前記熱電子の直接的な又は間接的な作用により前記イオン化室内で生成された試料成分由来のイオンが前記イオン射出口に向かう際に、前記磁場から受ける力に抗する方向に該イオンを偏向させる偏向電場を該イオン化室内に形成する偏向電場形成部と、
を備える質量分析装置。 - 前記偏向電場形成部は、前記イオン化室の内部又は該イオン化室の内壁の一部として配置された電極と、該電極に間欠的に電圧を印加する電圧発生部と、を含む、請求項1に記載の質量分析装置。
- 質量分離器として四重極マスフィルターを有し、該四重極マスフィルターを選択的に通過させるイオンの質量電荷比に応じて、前記偏向電場を形成するタイミングを調整する制御部、をさらに備える、請求項1に記載の質量分析装置。
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JPH07307134A (ja) * | 1994-05-11 | 1995-11-21 | Tdk Corp | 単色多価イオンビームの発生方法及びその装置 |
JP2016157523A (ja) * | 2015-02-23 | 2016-09-01 | 株式会社島津製作所 | イオン化装置 |
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