A newly developed prototype magnetic sector mass spectrometer with high resolving power

Abstract

In recent years, high-resolution mass spectrometers have been applied and made tunable to various fields. In this study, a prototype magnetic sector mass spectrometer with high resolving power has been developed. Its design is based on employing a 90 • magnetic sector-field analyzer with double trajectory, a miniature Nier-type ion source and two channel-type electron multipliers for ion detection. The ion accelerating voltage is controllable from 200 to 2500 V and the mass range demonstrated herein is (1-73) amu. The resolution of the instrument for the lower mass channel helium and higher mass channel nitrogen is about 0.008 amu and 0.05 amu (full width at half maximum), respectively, or m/∆m ≈ 550 in the whole mass range of (1-40) amu. The present sensitivity is measured to be approximately 8.4 × 10 −5 A/Pa.

Portable mass spectrometry system: instrumentation, applications, and path to ‘omics analysis

“…Yan et al. [32] reported that increasing the exit slit to 1.5 mm further improved the ionization efficiency.…”

“…Li et al [30] designed a miniature EI source which employs two identical rhenium-tungsten filaments featuring longer lifetime and improved stability with a power consumption of 15 W. Meng et al [31] developed the ionization chamber with a dimension of 12 × 12 × 7 mm 3 and an exit slit that is 1 mm wide. Yan et al [32] reported that increasing the exit slit to 1.5 mm further improved the ionization efficiency.…”

“…Sinha et al [121] reported the first miniaturized magnetic sector analyzer for coupling with portable GC instrument in 1991. here, the mass spectrograph type detection allowed high rate of ion detection rate in order to capture the GC chromatograph. The miniaturization of the analyzer was enabled by the development of powerful Nd-Fe-B type permanent magnet [31,32,122,123]. The mass range achieved was 40-240 m/z.…”

Enabling Isotope Ratio Measurements on an Ion Trap Mass Spectrometer

“…The most common instrumentation used for such measurements are sector instruments. Sector instruments provide very stable ion beams and separate ions spatially, allowing for a multicollector detection system . Multicollector detector arrays traditionally consist of either faraday cup detectors (FC), electron multipliers (EM), or a combination of both depending on the application.…”

“…Sector instruments provide very stable ion beams and separate ions spatially, allowing for a multicollector detection system. 18 Multicollector detector arrays traditionally consist of either faraday cup detectors (FC), 19 electron multipliers (EM), 20 or a combination of both depending on the application. Generally, faraday cups will have a longer lifetime and provide a linear response with the ion signal and are useful for measuring high abundance ions.…”