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Mass Analyzers: Common Types01:19

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Experimental Methods for Trapping Ions Using Microfabricated Surface Ion Traps
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Space-charge effects with mass-selective axial ejection from a linear quadrupole ion trap.

Hui Qiao1, Cong Gao, Dunmin Mao

  • 1Department of Chemistry, University of British Columbia, 2036 Main Mall, Vancouver, BC V6T 1Z1, Canada.

Rapid Communications in Mass Spectrometry : RCM
|November 19, 2011
PubMed
Summary

This study investigates methods to reduce space charge-induced mass shifts in quadrupole ion traps. Optimizing operating conditions like ejection q value and scan speed can significantly decrease these shifts, improving mass spectrometry accuracy.

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Area of Science:

  • Analytical Chemistry
  • Mass Spectrometry
  • Ion Optics

Background:

  • Space charge effects in ion traps cause mass shifts and peak broadening, reducing spectral accuracy.
  • Mass-selective axial ejection is a technique used to overcome these limitations.
  • Understanding the parameters influencing space charge is crucial for accurate mass measurements.

Purpose of the Study:

  • To investigate methods for reducing mass shifts caused by space charge in linear quadrupole ion traps.
  • To evaluate the impact of various operating parameters on mass shifts during axial ejection.

Main Methods:

  • Utilized mass-selective axial ejection with dipole excitation at q≈0.85.
  • Scanned trapping radiofrequency (rf) voltage to achieve ion resonance for excitation and ejection.
  • Experimentally studied the effects of injection q value, ejection q value, excitation amplitude, quadrupole dc voltages, exit lens rf voltage, and scan speed.

Main Results:

  • Mass shifts were generally reduced with higher ejection q values, higher excitation amplitudes, applied quadrupole dc voltages, and higher scan speeds.
  • Applying quadrupole dc voltages appeared to increase ion cloud temperature, thereby lowering mass shifts.
  • Observed that space charge decreases ion oscillation frequencies, requiring higher rf voltages and leading to higher apparent masses and broader peaks.

Conclusions:

  • Proper selection of operating conditions, including ejection q value, excitation amplitude, quadrupole dc application, and scan speed, can effectively reduce space charge-induced mass shifts.
  • While these methods can mitigate mass shifts, they cannot entirely eliminate them.