MS - Quadrupole Mass spectrometer
MS - Quadrupole mass spectrometers enable the analysis of molecules by mass and charge through ion selection in high vacuum. They are suitable for precise partial pressure measurements and residual gas analysis in laboratory settings.
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MS - Quadrupole Mass spectrometer
MS - Quadrupole mass spectrometers enable the analysis of molecules by mass and charge through ion selection in high vacuum. They are suitable for precise partial pressure measurements and residual gas analysis in laboratory settings.
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Thermo Fisher Scientific (Schweiz) AG
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Guide and selection support
Quadrupole mass spectrometers are primarily used in analytical laboratories to identify and quantify substances based on their mass-to-charge ratio. Ionization is typically achieved by electron impact, and ions are filtered by a dynamic electric field. When selecting a quadrupole MS, important aspects include mass accuracy, detection limits, and sample handling. LabFinder provides a clear overview for product selection, including technical features and helpful search terms. The platform assists in procuring mass spectrometers for a wide variety of analytical requirements.
Applications and Benefits
Quadrupole mass spectrometers are used for the precise analysis of molecules in the gas or residual gas phase by measuring their mass-to-charge ratio. They are suitable for use in high to ultra-high vacuum ranges and support residual gas analysis, trace gas analysis, and the identification of components in complex mixtures. The technology used in laboratories offers a good balance of accuracy, speed, and ease of use.
Selection Criteria
Key selection parameters include achievable mass accuracy, sensitivity or detection limit, the dynamic measurement range of the quadrupole, and compatibility with existing sample preparation methods (e.g., coupling with gas chromatography). The ionization method, usually electron impact ionization at about 70 eV, should suit the intended samples. User-friendliness, software integration, and maintenance efforts also play a role in device selection.
Variants and Measurement Principles
The basic measurement principle relies on ion selection via an alternating electric field inside four parallel rod electrodes that generate a quadrupole field. Ions with a specific mass-to-charge combination pass through the filter and are registered by the detector. Variants typically concern the quadrupole design (e.g., rod length, operating frequency) or coupling with other separation techniques (e.g., gas chromatography). The electron entry energy is typically 70 eV, characteristic for electron impact ionization.
Calibration and Maintenance
Regular calibration is required to ensure precise mass assignments, often using standard substances with known masses. Maintenance includes cleaning the quadrupole rods and the ion path as well as checking the high vacuum. Software-supported diagnostic tools help monitor instrument performance and enable timely maintenance actions.
Limitations of Application
Quadrupole mass spectrometers are especially suited for analyzing small and medium-sized molecules, offering good mass resolution, but generally have lower mass resolution and accuracy compared to other MS types like time-of-flight (TOF) or Fourier-transform ion cyclotron resonance (FT-ICR). The ionization method may not be ideal for very fragile molecules. Analysis of very complex or large molecules may require additional precautions.
Search and Related Terms
MS quadrupole, quadrupole MS, quadrupole mass spectrometer, mass spectrometer quadrupole, MS quadrupole mass spectrometer, quadrupole spectrometer, quadrupole mass spectrometry, mass spectrometer with quadrupole analysis, partial pressure measurement instrument, ion selectivity, electron impact ionization, m/e selection, residual gas analysis, high vacuum analysis instruments, MS detector.
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Frequently asked questions
How does a quadrupole mass spectrometer work?
In a quadrupole mass spectrometer, gas samples are ionized, usually by electron impact ionization. The resulting ions pass through four parallel rod electrodes that generate a dynamic electric field. This field filters the ions according to their mass-to-charge ratio, allowing only ions of certain masses to reach the detector.
For which applications is a quadrupole mass spectrometer especially suitable?
It is particularly well suited for residual gas analysis, partial pressure measurements in high vacuum, analysis of small to medium-sized molecules, and for combination with chromatographic separation techniques such as gas chromatography.
Which selection criteria are important for quadrupole MS instruments?
Important criteria include mass accuracy, detection limit, ionization method, compatibility with sample preparation, operability, software support, and maintenance effort.
What are the limitations of quadrupole technology compared to other mass spectrometers?
Quadrupole mass spectrometers provide lower mass resolution and accuracy than, for example, time-of-flight or FT-ICR types, and are less suited for very large or complex molecules as well as particularly sensitive substances.
How are quadrupole mass spectrometers calibrated and maintained?
Calibration is performed using standard compounds of known masses. Maintenance includes cleaning the quadrupole rods, checking the ion path and the high vacuum, as well as using software-supported diagnostics to ensure device performance.
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