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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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Tandem mass spectrometry is a technique that uses multiple mass analyzers in series to obtain a higher selectivity and reduce chemical noise during analyte detection. Instruments with multiple analyzers separated by an interaction cell enable secondary fragmentation and selected study of the fragment ions.Secondary fragmentations occur in the interaction cell and can be induced by various factors. Fragmentation induced by collision with inert gases, such as N2, Ar, He, etc., is called...
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Field-modulated selective ion storage in a quadrupole ion trap.

G Wellscor1, C Huston

  • 1Varian Chromatography Systems, 2700 Mitchell Drive, Walnut Creek, California, USA.

Journal of the American Society for Mass Spectrometry
|November 12, 2013
PubMed
Summary
This summary is machine-generated.

A new selective ion storage method uses resonance excitation and amplitude modulation in quadrupole ion traps. This technique enhances target ion storage and reduces loss from collision-activated dissociation.

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Area of Science:

  • Analytical Chemistry
  • Mass Spectrometry
  • Ion Optics

Background:

  • Quadrupole ion traps are widely used for mass analysis and ion manipulation.
  • Selective ion storage is crucial for improving sensitivity and reducing spectral complexity.
  • Conventional methods can lead to ion loss due to unwanted reactions or dissociation.

Purpose of the Study:

  • To introduce a novel method for selective ion storage in a quadrupole ion trap.
  • To enhance the storage efficiency of target ions while ejecting unwanted ions.
  • To minimize ion loss caused by collision-activated dissociation.

Main Methods:

  • Application of broadband waveforms to the endcaps for resonance excitation and ion ejection.
  • Implementation of a unique trapping field amplitude modulation technique.
  • Development of frequency-optimized waveforms with fewer frequency components.
  • Calculation of waveform requirements and optimization methods.

Main Results:

  • Demonstrated enhanced storage of selected target ions.
  • Achieved ejection of unwanted ions via resonance excitation.
  • Reduced target ion loss resulting from collision-activated dissociation.
  • Showed equivalent performance compared to methods using non-modulated fields and higher frequency density waveforms.

Conclusions:

  • The described method offers improved selective ion storage in quadrupole ion traps.
  • Amplitude modulation of trapping fields enables efficient waveform optimization.
  • This technique provides a valuable advancement for mass spectrometry applications requiring enhanced ion selectivity and reduced ion loss.