Magnetic sectors mass spectrometric

Performance Parameters. Since the detector is often involved in the separation of isobars, normal mass analyzer resolution and mass accuracy do not really apply. The mass spectrometric resolution would be determined by the magnetic and electric sectors. Only atomic species are analyzed, so that sets the upper m/z... 

By using non-normal beam incidence and curved pole pieces, the effective radius of curvature of the magnetic sector field is extended, which results in an increase in dispersion and an improvement in the abundance sensitivity of the mass spectrometric system.4... 

Preferably, electrospray ionization (ESI) is used in combination with quadrupole mass filters [16,17], whereas MALDI is commonly used in combination with the time-of-flight (TOF) analyzer [18], The relatively simple construction of these two types of analyzers and the resulting price advantage has led to their replacing the traditional magnetic sector instruments as the workhorses of mass spectrometric analysis. A more recent development is the ion-cyclotron-resonance (ICR) analyzer [19] which can be used for both ES-and MALDI-ionization. 

Tbe reader new to mass spectrometry is advised to consult an appropriate introductory text [2-9]. A few mass spectrometric terms will be explained here by way of background and to outline the principles of choosing a flame ionization detector, ions are produced in the mass spectrometric detector, but the mass spectrometer is able to analyze these ions further according to their molecular weights or rather, mass-to-charge ratios (m/z, see below) to provide a mass spectrum. Different principles are employed to achieve this in a variety of types of mass spectrometer. The instruments most commonly used in GC—MS are known as magnetic sector, quadrupole and ion trap mass spectrometers. Their differences are not further described here. Bench-top systems are of the quadrupole or ion trap type. 

Installing additional accessories in front of the ion source can render analytes amenable to ionization and subsequent mass spectrometric analysis. On-line sample treatment is especially important when analyzing liquid-phase, complex, and/or concentrated samples. For example a thermal vaporizer was used to enable analysis of liquid samples by a process mass spectrometer designed for gas analysis [196], This system has been successfully implemented in the monitoring of an esterification reaction [197]. The obtained data were in a good agreement with those recorded by in-line mid-infrared spectrometry. The setup incorporated a magnetic sector analyzer with two detectors an electron multiplier detector... 

Isotope-ratio mass spectrometry is used to determine the relative isotopic abundances of major and trace elements. Mass spectrometric methods are able to measure the relative concentrations of both radioactive and stable isotopes with a precision and accuracy of better than 0.001%. To achieve measurements of this quality, isotope-ratio MS relies almost exclusively on magnetic-sector instruments operated in temperature-controlled laboratories (Becker and Dietze 2000). 

Magnetic sector type SIMS Microspectrophotometry Matrix solid-phase dispersion Mass spectrometric thermal analysis... 

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