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Related Concept Videos

Mass Analyzers: Common Types01:19

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The quadrupole mass analyzer consists of four cylindrical metal rods arranged in a diamond carrying a DC voltage and a radio-frequency AC voltage. The motion of ions through the quadrupole depends on the field strength, causing only ions of a certain m/z to resonate successfully and strike the detector at a given field strength. Though the transmission rate for these analyzers is high, the exact elemental composition of the sample is not determined because of low resolution; however, they are...
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The mass analyzer is a crucial component of the mass spectrometer. In the ionization chamber, the vaporized sample is bombarded with a high-energy electron beam to generate a radical cation and further fragment into neutral molecules, radicals, and cations. A series of negatively charged accelerator plates accelerate the cations into the mass analyzer. The mass analyzer separates ions according to their mass-to-charge (m/z) ratios and then directs them to the detector. The common types of mass...
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Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
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Consider two charges of equal magnitude but opposite signs. If they cannot be separated by an external electric field, the system is called a permanent dipole. For example, the water molecule is a dipole, making it a good solvent.
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Experimental Methods for Trapping Ions Using Microfabricated Surface Ion Traps
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Linear ion trap with added octopole field component: the property and method.

Qiankun Dang1, Fuxing Xu1, Xiaohua Huang2

  • 1Shanghai Key Laboratory of Molecular Catalysis and Functional Material, Department of Chemistry and Laser Chemistry Institute, Fudan University, Shanghai, 200433, China.

Journal of Mass Spectrometry : JMS
|December 5, 2015
PubMed
Summary

Adding an octopole field component to a linear ion trap (LIT) improves performance. A novel LIT design using rectangular and semi-circular electrodes achieves high resolution and facilitates tandem mass spectrometry, simplifying fabrication.

Keywords:
linear ion trapoctopoleradial ejectionrectangular electrodesemi-circular electrode

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Area of Science:

  • Analytical Chemistry
  • Mass Spectrometry
  • Instrument Design

Background:

  • Superimposing octopole fields enhances ion trap mass analyzer performance.
  • Conventional radial-ejection linear ion traps (LITs) achieve octopole fields by stretching ejection rod pairs.

Purpose of the Study:

  • Investigate the impact of octopole and higher-order potentials on LIT performance.
  • Develop a simpler method for incorporating octopole components into LITs.

Main Methods:

  • Designed a novel LIT using a combination of rectangular and semi-circular electrodes.
  • Employed numerical simulations and experimental validation to study the device's properties.
  • Optimized electrode geometry for efficient ion ejection.

Main Results:

  • A positive octopole field component was successfully generated by adjusting rectangular electrode position and width.
  • Achieved a mass resolution exceeding 1200 at m/z 609 (1600 Da/s).
  • Demonstrated effective performance in tandem mass spectrometry experiments.
  • Optimal rectangular electrode geometry yielded performance comparable to semi-circular electrodes.

Conclusions:

  • The novel LIT design with mixed electrode shapes is effective for generating octopole fields.
  • This design offers a simple and easily fabricated alternative for enhancing LIT performance.
  • The method allows for tunable octopole field strength through geometric adjustments.