WO2017068729A1 - 飛行時間型質量分析装置 - Google Patents
飛行時間型質量分析装置 Download PDFInfo
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- WO2017068729A1 WO2017068729A1 PCT/JP2015/080028 JP2015080028W WO2017068729A1 WO 2017068729 A1 WO2017068729 A1 WO 2017068729A1 JP 2015080028 W JP2015080028 W JP 2015080028W WO 2017068729 A1 WO2017068729 A1 WO 2017068729A1
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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
- H01J49/40—Time-of-flight spectrometers
- H01J49/401—Time-of-flight spectrometers characterised by orthogonal acceleration, e.g. focusing or selecting the ions, pusher electrode
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J49/00—Particle spectrometers or separator tubes
- H01J49/0009—Calibration of the apparatus
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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
- H01J49/08—Electron sources, e.g. for generating photo-electrons, secondary electrons or Auger electrons
Definitions
- the present invention relates to a time-of-flight mass spectrometer, and more particularly to a time-of-flight mass spectrometer of an orthogonal acceleration method (sometimes referred to as a vertical acceleration method).
- TOF-MS Time-of-Flight Mass Spectrometer
- TOF-MS Time-of-Flight Mass Spectrometer
- the orthogonal acceleration type TOF-MS a certain group of ions are given to the ions incident on the orthogonal acceleration unit in a predetermined period in a direction orthogonal to the incident direction, and a group of ions is sent to the flight space.
- the orthogonal acceleration method TOF-MS accelerates a group of ions in a direction perpendicular to the incident direction, thereby eliminating the influence of flight time variation due to flight speed variation in the incident direction and improving mass resolution. be able to.
- a pair of electrodes are arranged opposite to each other across the region where the ions are incident (orthogonal acceleration region) of the orthogonal acceleration unit, and a pulse voltage is applied to the one set of electrodes at the predetermined cycle.
- the application of the pulse voltage is performed, for example, by switching a voltage applied from a power source.
- the period (corresponding to the predetermined period) in which the pulse voltage is applied and the ions are sent out is set to be longer than the time of flight of ions having the mass-to-charge ratio at the upper limit of the measurement mass range in TOF-MS.
- the orthogonal acceleration type TOF-MS is often used in combination with a liquid chromatograph or a gas chromatograph.
- a chromatographic mass spectrometer a plurality of target components separated in time by a chromatographic column are introduced into an orthogonal acceleration type TOF-MS, and they are sequentially subjected to mass spectrometry.
- the ions generated from each target component are different, and the mass-to-charge ratios of these ions are different. Therefore, a measurement mass range is set for each target component, and a pulse voltage is applied at a cycle corresponding to the measurement mass range, so that ions are To send.
- Each of the above-mentioned pair of electrodes has a stray capacitance, and the amount of current changes according to the period (interval) in which the pulse voltage is applied. Therefore, even when a constant voltage is applied, a voltage drop occurs in the electrode in a magnitude corresponding to the period. As a result, the energy applied to the ions varies depending on the period, and as a result, the flight time of the ions changes. As mentioned above, since TOF-MS determines the mass-to-charge ratio of ions based on the time of flight, if the flight time of ions changes, the mass-to-charge ratio will shift and the mass accuracy of the measurement results will decrease. There was a problem.
- the problem to be solved by the present invention is that the flight time of the orthogonal acceleration method does not decrease the mass accuracy of the measurement result even if the period of applying a voltage to the electrode for applying energy to direct ions to the flight space is changed.
- a mass spectrometer is provided.
- the first aspect of the present invention accelerates ions incident on the orthogonal acceleration region in a direction perpendicular to the direction of the incident and sends the ions to the flight space.
- An orthogonal acceleration time-of-flight mass spectrometer that determines the mass-to-charge ratio of ions based on time, a) an ion transport electrode for transporting ions to the orthogonal acceleration region; b) An orthogonal acceleration electrode that is disposed opposite to the orthogonal acceleration region and accelerates ions incident on the orthogonal acceleration region in a direction orthogonal to the direction of incidence, c) a flight path defining electrode having a flight tube disposed on the outer periphery of the flight space; d) Applied voltage information that is information on the magnitude of the voltage applied to the orthogonal acceleration electrode, the ion transport electrode, and the flight path defining electrode, the orthogonal acceleration electrode, the ion transport electrode, and the flight path defining For at least one of the electrodes
- ions having the same mass-to-charge ratio pass through the flight space in the same flight time. It can be created by obtaining a voltage value detected by flying. More specifically, the voltage drop having a magnitude corresponding to the ion sending cycle occurs in the pair of electrodes included in the orthogonal acceleration electrode, and as a result, the energy applied to the ions is offset.
- the applied voltage information can be created by experimentally obtaining a voltage value that accelerates or decelerates ions.
- the orthogonal acceleration time-of-flight mass spectrometer based on the applied voltage information stored in the storage unit in advance, at least one of the orthogonal acceleration electrode, the ion transport electrode, and the flight path defining electrode is used.
- the voltage application unit applies a voltage having a magnitude corresponding to the ion delivery cycle.
- the ion incident position in the orthogonal acceleration region changes, resulting in a difference in energy applied to the ions in the orthogonal acceleration part.
- the resulting change in flight time is offset.
- the ions are accelerated or decelerated according to the ion delivery cycle, and the energy applied to the ions by the orthogonal acceleration unit is increased.
- the change in flight time due to the difference is offset. Therefore, the mass accuracy of the measurement result does not decrease.
- the applied voltage information may be, for example, a table format in which the value of the applied voltage is associated with each of a plurality of periods, or a mathematical formula for obtaining the value of the applied voltage using the ion sending period as a variable.
- the time-of-flight mass spectrometer preferably further includes an acceleration electrode composed of a plurality of electrodes for accelerating ions from the orthogonal acceleration electrode toward the flight space.
- the acceleration electrode is associated with an applied voltage having a different magnitude according to the ion delivery cycle, thereby accelerating or decelerating ions according to the ion delivery cycle. It is also possible to cancel out changes in
- the ion transport electrode is an electrode for converging ions flying toward the orthogonal acceleration region, and includes, for example, a plurality of ring electrodes arranged so as to surround the incident axis of the ions.
- the flight path defining electrode includes a reflectron electrode for returning the ions in flight space in addition to the flight tube.
- the second aspect of the present invention accelerates ions incident on the orthogonal acceleration region in a direction orthogonal to the direction of the incident and sends the ions to the flight space.
- An orthogonal acceleration time-of-flight mass spectrometer that determines the mass-to-charge ratio of ions based on time, a) an orthogonal acceleration electrode disposed opposite to the incident axis of the incident ions; b) a voltage application unit for applying a voltage of a constant magnitude to the orthogonal acceleration electrode at a predetermined period; c) a flight time determination unit that detects ions after flying in the flight space and determines the flight time of the ions; d) a storage unit storing mass determination information, which is information defining a relationship between a flight time of the ions and a mass-to-charge ratio according to the period of the applied voltage; e) a mass-to-charge ratio determining unit that determines a mass-to-charge ratio of
- the mass determination information is created based on a result of a preliminary experiment in which a constant magnitude voltage is applied to the orthogonal acceleration electrode to obtain a flight time of ions having a known mass-to-charge ratio at a plurality of different periods. Can do.
- the energy applied to the ions also changes.
- the flight time of the ions changes according to the period of the applied voltage.
- the mass-to-charge ratio of ions is determined using the mass determination information in which the relationship between the time of flight of ions and the mass-to-charge ratio is defined according to the period of the applied voltage. The influence of changes in the flight time of the ions is eliminated. Therefore, even if the period of the applied voltage is changed, the mass accuracy of the measurement result does not decrease.
- the influence of the voltage drop that occurs with the magnitude according to the period of the applied voltage is applied to the applied voltage according to the period.
- the accuracy of the measurement results is reduced even if the period of the applied voltage is changed, because it is excluded by using information on the magnitude of the voltage (applied voltage information) or information on the relationship between the flight time and the mass-to-charge ratio (mass determination information) There is nothing to do.
- FIG. 3 is a diagram for explaining an applied voltage at an orthogonal acceleration electrode of the orthogonal acceleration type time-of-flight mass spectrometer according to the first embodiment.
- 6 is an example of time-of-flight-mass-to-charge ratio information in Example 2.
- a time-of-flight mass spectrometer is an orthogonal acceleration type time-of-flight mass spectrometer (TOF-MS), and applies a pulse voltage to a set of electrodes arranged in an orthogonal acceleration unit at a predetermined cycle.
- TOF-MS time-of-flight mass spectrometer
- the orthogonal acceleration type TOF-MS a voltage drop occurs in the orthogonal acceleration portion with a magnitude corresponding to the period of the applied voltage to one set of electrodes.
- the present invention has been made for the purpose of preventing the kinetic energy imparted to the ions from being changed by this voltage drop to reduce the mass accuracy of the measurement result.
- the present invention is characterized in that a means for compensating for the difference between the time of flight and the mass-to-charge ratio is provided.
- Example 1 is a liquid chromatograph mass spectrometer including one embodiment of a time-of-flight mass spectrometer according to the present invention.
- the mass spectrometer of the present embodiment is an orthogonal acceleration type reflectron type TOF-MS.
- the liquid chromatograph / mass spectrometer of Example 1 has a liquid chromatograph section 1, a mass spectrometer section 2, and a control section 4 for controlling these operations.
- the liquid chromatograph unit 1 includes a mobile phase container 10 in which a mobile phase is stored, a pump 11 that sucks the mobile phase and delivers it at a constant flow rate, and a mobile phase. And a column 13 for separating various compounds contained in the sample solution in the time direction.
- the mass analysis unit 2 includes a first intermediate chamber whose degree of vacuum is increased stepwise between an ionization chamber 20 that is substantially atmospheric pressure and a high-vacuum analysis chamber 24 that is evacuated by a vacuum pump (not shown). 21, the second intermediate chamber 22, and the third intermediate chamber 23.
- the ionization chamber 20 is provided with an electrospray ionization probe (ESI probe) 201 that sprays while applying a charge to the sample solution eluted from the column 13 of the liquid chromatograph section 1.
- ESI probe electrospray ionization probe
- the ionization chamber 20 and the first intermediate chamber 21 communicate with each other through a small heating capillary 202.
- the first intermediate chamber 21 and the second intermediate chamber 22 are separated by a skimmer 212 having a small hole at the top, and each of the first intermediate chamber 21 and the second intermediate chamber 22 is used for transporting ions to the subsequent stage while converging.
- Ion guides 211 and 221 are arranged.
- a quadrupole mass filter 231 that separates ions according to a mass-to-charge ratio
- a collision cell 232 having a multipole ion guide 233 therein, and ions discharged from the collision cell 232 are transported.
- An ion guide 234 is arranged for this purpose.
- the collision cell 232 is supplied with CID gas such as argon or nitrogen continuously or intermittently.
- the analysis chamber 24 includes an ion transport electrode 241 for transporting ions incident from the third intermediate chamber 23 to the orthogonal acceleration unit, and two electrodes 242A arranged opposite to each other with an incident optical axis (orthogonal acceleration region) of ions interposed therebetween.
- An accelerating electrode 242 comprising 242B, an accelerating electrode 243 for accelerating the ions sent to the flight space by the orthogonal accelerating electrode 242, a reflectron electrode 244 (244A, 244B) for forming a return orbit of the ions in the flight space, and A detector 245 and a flight tube 246 located at the outer edge of the flight space are provided.
- the reflectron electrode 244 and the flight tube 246 correspond to the flight path defining electrode in the present invention.
- the mass spectrometer 2 can perform MS scan measurement, MS / MS scan measurement, or MS n scan measurement (n is an integer of 3 or more).
- MS / MS scan measurement product ion scan measurement
- CID gas is supplied into the collision cell 232, and the precursor ions are cleaved to generate product ions.
- product ions are introduced into the flight space, and the mass-to-charge ratio is obtained based on their flight time.
- the control unit 4 includes a storage unit 41 and includes a measurement execution unit 42, a voltage application unit 43, a flight time determination unit 44, and a mass-to-charge ratio determination unit 45 as functional blocks. Moreover, it has the function to control each operation
- the entity of the control unit 4 is a personal computer, and can function as the above-described units by executing a program installed in advance in the computer.
- An input unit 6 and a display unit 7 are connected to the control unit 4.
- the storage unit 41 stores time-of-flight-mass-to-charge ratio information and applied voltage information.
- the time-of-flight-mass-to-charge ratio information is information describing the time required for ions having various mass-to-charge ratios to fly through the flight space of the mass analyzer 2.
- the applied voltage information is information on the values of applied voltages to the ion transport electrode 241, the orthogonal acceleration electrode 242, the acceleration electrode 243, the reflectron electrode 244, and the flight tube 246, and in this embodiment, the orthogonal acceleration electrode 242 is used. Is applied with different applied voltages according to the ion delivery cycle.
- the orthogonal acceleration electrode 242 disposed in the analysis chamber 24 has a stray capacitance, and the amount of current changes according to the period (interval) in which the pulse voltage is applied. Therefore, as shown in FIG. 2, even when a voltage A0 having a constant magnitude is applied, the electrodes 242A and 242B cause a voltage drop with a magnitude corresponding to the period.
- the applied voltage information used in the present embodiment compensates for this voltage drop, and the period and applied voltage are determined based on the results of preliminary experiments so that constant energy is given to ions regardless of the period of the applied voltage. This is information associated with the size.
- a table in which different applied voltage values (voltages A1, A2, A3) are associated with the three types of ion delivery cycles (125 ⁇ s, 250 ⁇ s, 500 ⁇ s) is used. It is done.
- the user inputs the retention time and measurement mass range of each component contained in the sample through the input unit 6 (FIG. 4).
- the retention time of component A is 3.0 min and the measurement mass range is 100-2000
- the retention time of component B is 5.0 min and the measurement mass range is 100-10000
- the retention time of component C is 8.0 min
- the measurement mass range is 2000-40000.
- the measurement execution unit 42 refers to the time-of-flight-mass-to-charge ratio information, and detects ions having the maximum mass-to-charge ratio within the measurement mass range from the orthogonal acceleration electrode 242 for each of the components A, B, and C. The time required to fly to the vessel 245 is obtained. Then, a cycle longer than that time and closest to the time is determined from the three types of applied voltage cycles described in the applied voltage information. In this embodiment, voltage application periods of 125 ⁇ s, 250 ⁇ s, and 500 ⁇ s are determined for each of component A, component B, and component C. In the case of ions with short flight times (ions with a small mass-to-charge ratio), use a cycle longer than the cycle determined by the above procedure to accumulate more ions in the ion trap and increase the efficiency of ion utilization. You may make it raise.
- the measurement execution unit 42 determines the measurement conditions, creates a file describing the conditions, and stores the file in the storage unit 41. Specifically, the measurement time corresponding to each holding time of each component input by the user is determined, and the measurement mass range, the cycle of the applied voltage, the magnitude of the applied voltage, and the like are associated with each measurement time. Thus, the measurement conditions are determined (FIG. 5).
- the measurement of detecting ions with a mass-to-charge ratio of 100-2000 by sending out ions at a cycle of 125 ⁇ s is repeated a predetermined number of times (for example, 50 times). Accumulate and output the results.
- the measurement of detecting ions with a mass-to-charge ratio of 100-2000 by sending out ions with a period of 125 ⁇ s is repeated a predetermined number of times, and the ions are sent with a period of 250 ⁇ s to send the mass-to-charge ratio.
- the measurement for detecting 2000-10000 ions is repeated a predetermined number of times, and further, a series of measurements of sending ions at a cycle of 500 ⁇ s and detecting ions having a mass-to-charge ratio of 10000-40000 is repeated a predetermined number of times as one set. Repeat a set of measurements.
- the lower part of FIG. 6 shows one set of measurements repeated for a measurement time of 6.0-7.0 min.
- a set of a series of measurements in which two types of measurements (250 ⁇ s and 500 ⁇ s) are performed a predetermined number of times is set as one set, and the one set of measurements is repeatedly performed.
- the measurement execution unit 42 displays a screen for prompting the user to start analysis on the display unit 7.
- the measurement execution unit 42 executes analysis by controlling each part of the liquid chromatograph unit 1 and the mass analysis unit 2 based on the contents described in the measurement condition file. A voltage is applied to each part based on the applied voltage information. And the product ion produced
- the flight time determination unit 44 determines the flight time of each detected product ion based on the ion detection signal in the detector 245.
- the mass-to-charge ratio determining unit 45 determines the mass-to-charge ratio of each product ion based on the time-of-flight-mass-to-charge ratio information stored in the storage unit 41.
- a voltage having a magnitude that takes into consideration the influence of a voltage drop that occurs at a magnitude corresponding to the period of the applied voltage is applied from the power source to the orthogonal acceleration electrode 242. Therefore, a constant energy can be imparted to the ions regardless of the period of the applied voltage and sent to the flight space (FIG. 6). Therefore, even if the period of the applied voltage is changed, the mass accuracy of the measurement result does not decrease.
- a table format in which the magnitude of the applied voltage is associated with each of the three predetermined periods as the applied voltage information is used.
- the relationship between the period and magnitude of the applied voltage is used. Attached graphs and mathematical formulas can also be used.
- the magnitude of the voltage applied to the orthogonal acceleration electrode 242 is changed according to the ion transmission period, but other electrodes (the ion transport electrode 241, the acceleration electrode 243, the reflectron electrode 244).
- the same effect as described above can also be obtained by changing the magnitude of the voltage applied to the flight tube 246) in accordance with the ion sending cycle.
- the same voltage is applied to the ion transport electrode 241 and the electrodes 242A and 242B of the orthogonal acceleration electrode 242, but the same voltage is applied to the ion transport electrode 241 and the electrode 242A.
- a voltage lower than these (smaller absolute value) is applied to the electrode 242B (here, the applied voltage has the same polarity as the ions)
- the ions enter the orthogonal acceleration region while facing the electrode 242B.
- the flight time of ions is shortened. Accordingly, a decrease in energy applied to ions (which increases the flight time of ions) can be offset.
- the magnitude of the voltage applied to the acceleration electrode 243 When the magnitude of the voltage applied to the acceleration electrode 243 is changed, the magnitude of energy applied to the ions sent from the orthogonal acceleration electrode 242 toward the flight space can be changed. Therefore, the same effect as described above can also be obtained by applying a voltage having a different magnitude depending on the ion delivery cycle to the acceleration electrode 243.
- the same effect as described above can also be obtained by applying a voltage having a different magnitude to the flight tube 246 according to the ion delivery cycle.
- the voltage drop generated at the orthogonal acceleration electrode 242 can be offset by changing the magnitude of the voltage applied to each electrode constituting the TOF-MS in accordance with the ion sending cycle.
- a high voltage of several thousand volts is constantly applied to the acceleration electrode 243, the reflectron electrode 244, and the flight tube 246, so that the value is finely changed during measurement and the size is accurately controlled. Difficult to do.
- the magnitude of the voltage that is constantly applied to the ion transport electrode 241 and the orthogonal acceleration electrode 242 is normally about several tens of volts (however, the electrode 242A is used during the orthogonal acceleration of ions).
- the magnitude of the pulse voltage applied to 242B is several thousand volts), and it is preferable to change the magnitude of the voltage applied to these according to the ion delivery period.
- FIG. 7 shows the main configuration. Since the configurations of the liquid chromatograph unit 1 and the mass spectrometer unit 2 are the same as those of the first embodiment, description thereof will be omitted, and the configuration of the control unit 40 will be mainly described.
- the control unit 40 includes a storage unit 411, and includes a measurement execution unit 421, a voltage application unit 431, a flight time determination unit 44, and a mass-to-charge ratio determination unit 451 as functional blocks. Further, similarly to the first embodiment, the liquid chromatograph unit 1 and the mass spectrometer unit 2 each have a function of controlling the operation of each unit.
- the entity of the control unit 40 is a personal computer, to which an input unit 6 and a display unit 7 are connected.
- the storage unit 411 stores time-of-flight-mass-to-charge ratio information different from that in the first embodiment. In the second embodiment, different time-of-flight-mass-to-charge ratio information is used for each period of applied voltage.
- the time-of-flight-mass-to-charge ratio information that takes account of the change is used in consideration of changes in the time of flight of ions according to the period of the applied voltage, as shown in FIG.
- time-of-flight-mass-to-charge ratio information of the present embodiment various information such as a table format and a mathematical expression can be used in addition to the graph format as shown in FIG. Or you may correct
- the user inputs the retention time and measurement mass range of each component contained in the sample through the input unit 6 (FIG. 4).
- the retention time of component A is 3.0 min and the measurement mass range is 100-2000
- the retention time of component B is 5.0 min and the measurement mass range is 100-10000
- the retention time of component C is 8.0 min
- the measurement mass range is 300-40000.
- the measurement execution unit 421 refers to the time-of-flight-mass-to-charge ratio information, and detects ions having the maximum mass-to-charge ratio within the measurement mass range from the orthogonal acceleration electrode 242 for each of the components A, B, and C.
- the time required to fly to the vessel 245 is obtained.
- a period longer than that time and closest to the time is determined from three predetermined periods of applied voltages (125 ⁇ s, 250 ⁇ s, and 500 ⁇ s).
- voltage application periods of 125 ⁇ s, 250 ⁇ s, and 500 ⁇ s are determined for each of component A, component B, and component C.
- time-of-flight-mass-to-charge ratio information referred to here may be any of the three types of time-of-flight-mass-to-charge ratio information, but the longest time-of-flight is associated with ions of the same mass-to-charge ratio. (Ie, time-of-flight-mass-to-charge information for a period of 125 ⁇ s, which has the largest voltage drop and the least energy applied to the ions).
- the measurement execution unit 421 determines the measurement conditions, creates a file describing the conditions, and stores the file in the storage unit 411.
- the measurement execution unit 421 determines a measurement time corresponding to each holding time of each component input by the user, and includes a measurement mass range, a cycle of the applied voltage, a magnitude of the applied voltage, and the like for each measurement time.
- the measurement conditions are determined by associating with each other (FIG. 9).
- a voltage A0 having a constant magnitude is applied to the orthogonal acceleration electrode 242 regardless of the period of the applied voltage.
- the measurement execution unit 421 When the measurement conditions for each component are determined, the measurement execution unit 421 creates a measurement condition file and stores it in the storage unit 411. Then, a screen prompting the user to start analysis is displayed on the display unit 7. When the user instructs the start of analysis, the measurement execution unit 421 executes analysis by controlling each part of the liquid chromatograph unit 1 and the mass analysis unit 2 based on the contents described in the measurement condition file.
- the flight time determination unit 44 determines the flight time for each of the product ions generated from each component based on the period of the applied voltage and the ion detection signal from the detector 245.
- the mass-to-charge ratio determining unit 451 includes the time-of-flight-mass corresponding to the period of the applied voltage in the measurement time zone in which each product ion is detected in the time-of-flight-mass-to-charge ratio information stored in the storage unit 41. Using the charge ratio information, the mass to charge ratio is determined. As described above, the time-of-flight-mass-to-charge ratio information of the present embodiment is created in consideration of the fact that the energy imparted to the ions changes due to the voltage drop that occurs according to the period of the applied voltage. The mass-to-charge ratio can be determined accurately regardless of the voltage period.
- the case where the energy applied to the ions decreases due to the voltage drop at the orthogonal acceleration electrode 242 has been described as an example, but the energy applied to the ions may increase due to the voltage drop.
- An example is shown in FIG.
- the solid line indicates the potential of each part in the design
- the broken line indicates the potential after the voltage drop in the electrodes 242A and 242B.
- the voltage drop at the electrode 242B is larger than the voltage drop at the electrode 242A
- the potential in the orthogonal acceleration region becomes higher than the designed potential.
- the energy imparted to the ions accelerated toward the flight space is increased, and the flight time of the ions is shortened.
- the voltage drop at the electrode 242B has only the electrode 242B disposed on one side thereof, whereas the electrode 242B has only one electrode 242B. Then, since the electrode 242A is arranged on one side and the acceleration electrode 243 is arranged on the opposite side, the stray capacitance of the electrode 242B is larger.
- Example 1 the product ion scan measurement was performed in the liquid chromatograph mass spectrometer, but the mass-to-charge ratio was determined based on the flight time of ions in the orthogonal acceleration type mass spectrometer. Can be used in equipment and measurements.
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Abstract
Description
a) 前記直交加速領域にイオンを輸送するイオン輸送電極と、
b) 前記直交加速領域を挟んで対向配置され、該直交加速領域に入射したイオンを該入射の方向と直交する方向に加速する直交加速電極と、
c) 前記飛行空間の外周に配置されるフライトチューブを有する飛行経路規定電極と、
d) 前記直交加速電極、前記イオン輸送電極、及び飛行経路規定電極に印加する電圧の大きさに関する情報である印加電圧情報であって、前記直交加速電極、前記イオン輸送電極、及び前記飛行経路規定電極のうちの少なくとも1つについて、イオンの送出周期に応じて異なる大きさの印加電圧が対応付けられた印加電圧情報が保存された記憶部と、
e) 前記印加電圧情報に基づき、前記直交加速電極、前記イオン輸送電極、及び飛行経路規定電極に電圧を印加する電圧印加部と
を備えることを特徴とする。
直交加速電極に対してイオンの送出周期に応じて異なる大きさの電圧を印加すると、イオンの送出周期を変化させて測定を行っても、イオンに付与されるエネルギーが一定に保たれる。
また、イオン輸送電極に対してイオンの送出周期に応じて異なる大きさの電圧を印加すると、直交加速領域内でのイオン入射位置が変化し、直交加速部でイオンに付与されるエネルギーの違いに起因する飛行時間の変化が相殺される。
さらに、飛行経路規定電極に対してイオンの送出周期に応じて異なる大きさの電圧を印加すると、イオンの送出周期に応じてイオンが加速又は減速され、直交加速部でイオンに付与されるエネルギーの違いに起因する飛行時間の変化が相殺される。
従って、測定結果の質量精度が低下することがない。
前記イオン輸送電極は、直交加速領域に向かって飛行するイオンを収束させる電極であり、例えば前記イオンの入射軸を取り囲むように配置された複数のリング状電極で構成される。
また、リフレクトロン型のTOF-MSの場合、前記飛行経路規定電極には、フライトチューブに加え、飛行空間においてイオンを折り返し飛行させるためのリフレクトロン電極も含まれる。
a) 前記入射するイオンの入射軸を挟んで対向配置された直交加速電極と、
b)予め決められた周期で一定の大きさの電圧を前記直交加速電極に印加する電圧印加部と、
c) 前記飛行空間を飛行した後のイオンを検出して該イオンの飛行時間を決定する飛行時間決定部と、
d) 前記印加電圧の周期に応じて前記イオンの飛行時間と質量電荷比の関係が規定された情報である質量決定情報が保存された記憶部と、
e) 前記質量決定情報に基づき、前記飛行時間決定部により決定されたイオンの飛行時間からイオンの質量電荷比を決定する質量電荷比決定部と
を備えることを特徴とする。
また、測定時間4.0-6.0minの間は、125μsの周期でイオンを送出して125μsの周期でイオンを送出して質量電荷比100-2000のイオンを検出する測定を所定回数繰り返した後、250μsの周期でイオンを送出して質量電荷比2000-10000のイオンを検出する測定を所定回数繰り返すという一連の測定を1セットとして、該1セットの測定を繰り返し実行する。
さらに、測定時間6.0-7.0minの間は、125μsの周期でイオンを送出して質量電荷比100-2000のイオンを検出する測定を所定回数繰り返し、250μsの周期でイオンを送出して質量電荷比2000-10000のイオンを検出する測定を所定回数繰り返し、さらに500μsの周期でイオンを送出して質量電荷比10000-40000のイオンを検出する測定を所定回数繰り返すという一連の測定を1セットとして、該1セットの測定を繰り返し実行する。図6の下段に、測定時間6.0-7.0minの間に繰り返される1セットの測定を示す。
測定時間7.0-10.0minも、上記同様に、2種類の周期(250μs、500μs)の測定をそれぞれ所定回数実行する一連の測定を1セットとして、該1セットの測定が繰り返し実行される。
10…移動相容器
11…ポンプ
12…インジェクタ
13…カラム
2…質量分析部
20…イオン化室
202…加熱キャピラリ
21…第1中間室
211…イオンガイド
212…スキマー
22…第2中間室
23…第3中間室
231…四重極マスフィルタ
232…コリジョンセル
233…多重極イオンガイド
234…イオンガイド
24…分析室
241…イオン輸送電極
242…直交加速電極
243…加速電極
244…リフレクトロン電極
245…検出器
246…フライトチューブ
4、40…制御部
41、411…記憶部
42、421…測定実行部
43、431…電圧印加部
44…飛行時間決定部
45、451…質量電荷比決定部
6…入力部
7…表示部
Claims (3)
- 直交加速領域に入射するイオンを該入射の方向に直交する方向に加速して飛行空間に送出し、該飛行空間における飛行時間に基づきイオンの質量電荷比を決定する直交加速方式の飛行時間型質量分析装置であって、
a) 前記直交加速領域にイオンを輸送するイオン輸送電極と、
b) 前記直交加速領域を挟んで対向配置され、該直交加速領域に入射したイオンを該入射の方向と直交する方向に加速する直交加速電極と、
c) 前記飛行空間の外周に配置されるフライトチューブを有する飛行経路規定電極と、
d) 前記直交加速電極、前記イオン輸送電極、及び飛行経路規定電極に印加する電圧の大きさに関する情報である印加電圧情報であって、前記直交加速電極、前記イオン輸送電極、及び前記飛行経路規定電極のうちの少なくとも1つについて、イオンの送出周期に応じて異なる大きさの印加電圧が対応付けられた印加電圧情報が保存された記憶部と、
e) 前記印加電圧情報に基づき、前記直交加速電極、前記イオン輸送電極、及び飛行経路規定電極に電圧を印加する電圧印加部と
を備えることを特徴とする飛行時間型質量分析装置。 - 前記印加電圧情報が、複数の周期のそれぞれに印加電圧の値を対応づけたテーブル形式のものであることを特徴とする請求項1に記載の飛行時間型質量分析装置。
- 直交加速領域に入射するイオンを該入射の方向に直交する方向に加速して飛行空間に送出し、該飛行空間における飛行時間に基づきイオンの質量電荷比を決定する直交加速方式の飛行時間型質量分析装置であって、
a) 前記入射するイオンの入射軸を挟んで対向配置された直交加速電極と、
b) 予め決められた周期で一定の大きさの電圧を前記直交加速電極に印加する電圧印加部と、
c) 前記飛行空間を飛行した後のイオンを検出して該イオンの飛行時間を決定する飛行時間決定部と、
d) 前記印加電圧の周期に応じて前記イオンの飛行時間と質量電荷比の関係が規定された情報である質量決定情報が保存された記憶部と、
e) 前記質量決定情報に基づき、前記飛行時間決定部により決定されたイオンの飛行時間からイオンの質量電荷比を決定する質量電荷比決定部と
を備えることを特徴とする飛行時間型質量分析装置。
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