EP2820667A2 - Verfahren zur bestimmung des maximums des massenpeaks in der massenspektrometrie - Google Patents
Verfahren zur bestimmung des maximums des massenpeaks in der massenspektrometrieInfo
- Publication number
- EP2820667A2 EP2820667A2 EP13708748.2A EP13708748A EP2820667A2 EP 2820667 A2 EP2820667 A2 EP 2820667A2 EP 13708748 A EP13708748 A EP 13708748A EP 2820667 A2 EP2820667 A2 EP 2820667A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- values
- amplitude
- value
- measurement
- maximum
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J49/00—Particle spectrometers or separator tubes
- H01J49/0027—Methods for using particle spectrometers
- H01J49/0036—Step by step routines describing the handling of the data generated during a measurement
-
- 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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J49/00—Particle spectrometers or separator tubes
- H01J49/0027—Methods for using particle spectrometers
- H01J49/0031—Step by step routines describing the use of the apparatus
-
- 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
-
- 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
- H01J49/28—Static spectrometers
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J49/00—Particle spectrometers or separator tubes
- H01J49/02—Details
- H01J49/04—Arrangements for introducing or extracting samples to be analysed, e.g. vacuum locks; Arrangements for external adjustment of electron- or ion-optical components
Definitions
- the invention relates to a method for determining the maximum of the mass peak of the molecules measured by means of mass spectrometry.
- Mass spectrometers are used for the analysis of gases and are used in particular in leak detectors.
- the substance to be examined is ionized by electrons in the gas phase and fed to an analyzer.
- the anode voltage determines the setpoint for the mass position.
- a cathode and an anode we create an electric field that accelerates the electrons leaving the cathode, which ionize the gas molecules present.
- the charged ions are accelerated by the anode potential and, when they have passed the separation system, reach the catcher.
- the separation system contains a magnetic field that deflects the ions.
- the too heavy ions are deflected too small by the magnetic field, while the too light ions are too much distracted.
- the anode potential determines the mass that passes through the separation system. In the region of a mass results in a signal amplitude, which depends on the exact anode potential, such that the signal amplitude at a little too small or a little too large anode potential is less than the maximum.
- the ratios are comparable, whereby the same method is applicable.
- the invention has for its object to provide a faster method for determining the mass balance for mass spectrometry.
- the method according to the invention is defined by the features of claim 1. Accordingly, the respective signal values are recorded for at least three different setting values or anode voltages. If the first or the last amplitude value is maximum, the measurement is repeated for other setting values until a measured signal amplitude between the first and the last measured signal amplitude is maximum. Before the recording of each measuring point, it is preferable to wait until the amplitude signal has settled. The measured amplitude values and the associated setting values are stored as measuring points. Subsequently, a quadratic function is determined, which contains the measuring points. The maximum of the quadratic function is determined and used to determine the maximum of the set values for the desired molecular weight.
- the measurement is carried out according to the invention with at least three different setting values and with no more than ten setting values.
- the determination of the maximum of a square function containing the measurement points eliminates the need for successive measurements, which also results in a faster determination of molecular weight.
- the invention is based on the idea to conclude from only a few measured values on the actual course of the measurement signal without completely measuring the course.
- the x-values are the mass axis, ie, the predetermined set values
- the y-values are the measured amplitude values for each set value.
- the constants a and b can be determined after establishing a system of equations for the measuring points.
- the x-value of the maximum of the function is formed by forming the first derivative of the function quadratic function determined.
- the x value corresponding to the maximum is the set value of the molecular weight sought.
- the first or the last of the recorded amplitude values should be maximum, this is an indication that the searched maximum does not lie between these two measured values. Since the amplitude function does not exactly correspond to a parabola, it is advisable to repeat the measurement for a new range of setting values, the first setting value corresponding to the last setting value of the previous measurement. In this way, the measurements are repeated until a maximum amplitude measured value is established between the respective first and the last setting value of a measurement. If the setting values have been selected correctly, the average value is usually greater than the neighboring values already during the first measurement. For the measured values of this last measurement, the maximum is then determined according to the method described above.
- the accuracy of the method according to the invention can be increased by the fact that, as soon as there is a maximum amplitude value between the first and the last setting value, further amplitude values for setting values located closer to one another are recorded around this amplitude value. In other words, in other words, the distances between the setting values of the repeated measurement and the setting value of the maximum amplitude value are smaller than in the respective previous measurement.
- FIG. 1 shows a graphical representation of the measured values according to the invention.
- the self-adjusting amplitude values A1, A2 and A3 are measured for three different setting values M1, M2 and M3.
- the measured amplitude values AI, A2, A3 are together with the associated Setting values M l, M2, M3 as coordinate pairs (M l, AI), (M2, A2) and (M3, A3) stored.
- the coordinate pairs are plotted in the figure as points in a coordinate system.
- the x-axis corresponds to the setting values, ie the mass axis M
- the y-axis corresponds to the associated amplitude axis A.
- the figure shows that the amplitude value A2 of the average setting value M2 is greater than the amplitude values A1 and A3 of the first set value M l and the last set value M3. This means that the maximum of the sought gradient is between the first set value M l and the third set value M3. If this is not the case, the measurement would have to be repeated, with the first set value M l of a subsequent measurement corresponding to the set value M3 of the respective previous measurement, in order to omit any range.
- a parabola is searched containing these measurement points.
- the quadratic function y ax 2 + bx + c with the mathematical constants a, b, c is set up as a parabola.
- the x values correspond to the setting values, which in the case of sector field mass spectrometers corresponds to the anode voltage and the y values to the associated amplitude values.
- a system of equations is set up using the measurement points and resolved according to the constants a and b.
Landscapes
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Other Investigation Or Analysis Of Materials By Electrical Means (AREA)
- Electron Tubes For Measurement (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102012203137A DE102012203137A1 (de) | 2012-02-29 | 2012-02-29 | Verfahren zur Bestimmung des Maximums des Massenpeaks in der Massenspektrometrie |
| PCT/EP2013/054055 WO2013127933A2 (de) | 2012-02-29 | 2013-02-28 | Verfahren zur bestimmung des maximums des massenpeaks in der massenspektrometrie |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP2820667A2 true EP2820667A2 (de) | 2015-01-07 |
| EP2820667B1 EP2820667B1 (de) | 2020-04-22 |
Family
ID=47845968
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP13708748.2A Active EP2820667B1 (de) | 2012-02-29 | 2013-02-28 | Verfahren zur bestimmung des maximums des massenpeaks in der massenspektrometrie |
Country Status (9)
| Country | Link |
|---|---|
| US (1) | US9147561B2 (de) |
| EP (1) | EP2820667B1 (de) |
| JP (1) | JP6263132B2 (de) |
| CN (1) | CN104137222B (de) |
| DE (1) | DE102012203137A1 (de) |
| IN (1) | IN2014DN07155A (de) |
| RU (1) | RU2633513C2 (de) |
| TW (1) | TWI589871B (de) |
| WO (1) | WO2013127933A2 (de) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10124856B2 (en) * | 2015-07-20 | 2018-11-13 | Jeffrey John Cederstrom | Aerobar-mounted rotational torque surge brake for a bicycle |
Family Cites Families (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10324766A1 (de) * | 2003-05-31 | 2004-12-16 | Inficon Gmbh | Leckraten-Messvorichtung |
| US20050080571A1 (en) * | 2003-10-10 | 2005-04-14 | Klee Matthew S. | Mass spectrometry performance enhancement |
| JP4284167B2 (ja) * | 2003-12-24 | 2009-06-24 | 株式会社日立ハイテクノロジーズ | イオントラップ/飛行時間型質量分析計による精密質量測定方法 |
| GB2412487A (en) * | 2004-03-26 | 2005-09-28 | Thermo Finnigan Llc | A method of improving a mass spectrum |
| US7227130B2 (en) * | 2004-05-20 | 2007-06-05 | Mds Inc. | Method for providing barrier fields at the entrance and exit end of a mass spectrometer |
| JP2006184275A (ja) * | 2004-11-30 | 2006-07-13 | Jeol Ltd | 質量分析方法および質量分析装置 |
| US20060255258A1 (en) * | 2005-04-11 | 2006-11-16 | Yongdong Wang | Chromatographic and mass spectral date analysis |
| DE102005028557A1 (de) * | 2005-06-21 | 2007-01-04 | Inficon Gmbh | Verfahren zum Kalibrieren eines spektrometrischen Schnüffellecksuchers |
| WO2009048739A2 (en) * | 2007-10-10 | 2009-04-16 | Mks Instruments, Inc. | Chemical ionization reaction or proton transfer reaction mass spectrometry with a quadrupole or time-of-flight mass spectrometer |
| US8258462B2 (en) * | 2008-09-05 | 2012-09-04 | Thermo Finnigan Llc | Methods of calibrating and operating an ion trap mass analyzer to optimize mass spectral peak characteristics |
| CA2787504A1 (en) * | 2010-10-07 | 2012-04-12 | The Government Of United States Of America As Represented By The Secreta Ry Of The Department Of Health And Human Services Center For Disease Con | Use of detector response curves to optimize settings for mass spectrometry |
| EP2447980B1 (de) * | 2010-11-02 | 2019-05-22 | Thermo Fisher Scientific (Bremen) GmbH | Verfahren zur Herstellung eines Massenspektrums mit verbessertem Auflösungsvermögen |
-
2012
- 2012-02-29 DE DE102012203137A patent/DE102012203137A1/de not_active Ceased
-
2013
- 2013-02-28 CN CN201380011043.3A patent/CN104137222B/zh active Active
- 2013-02-28 US US14/381,170 patent/US9147561B2/en active Active
- 2013-02-28 EP EP13708748.2A patent/EP2820667B1/de active Active
- 2013-02-28 JP JP2014559220A patent/JP6263132B2/ja active Active
- 2013-02-28 WO PCT/EP2013/054055 patent/WO2013127933A2/de not_active Ceased
- 2013-02-28 RU RU2014138548A patent/RU2633513C2/ru active
- 2013-03-01 TW TW102107242A patent/TWI589871B/zh active
-
2014
- 2014-08-26 IN IN7155DEN2014 patent/IN2014DN07155A/en unknown
Non-Patent Citations (1)
| Title |
|---|
| See references of WO2013127933A2 * |
Also Published As
| Publication number | Publication date |
|---|---|
| TWI589871B (zh) | 2017-07-01 |
| IN2014DN07155A (de) | 2015-04-24 |
| CN104137222A (zh) | 2014-11-05 |
| WO2013127933A2 (de) | 2013-09-06 |
| US9147561B2 (en) | 2015-09-29 |
| WO2013127933A3 (de) | 2013-12-19 |
| TW201341793A (zh) | 2013-10-16 |
| JP2015508898A (ja) | 2015-03-23 |
| EP2820667B1 (de) | 2020-04-22 |
| US20150014523A1 (en) | 2015-01-15 |
| RU2633513C2 (ru) | 2017-10-13 |
| CN104137222B (zh) | 2016-08-24 |
| JP6263132B2 (ja) | 2018-01-31 |
| DE102012203137A1 (de) | 2013-08-29 |
| RU2014138548A (ru) | 2016-04-20 |
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