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Area of Science:

  • Analytical Chemistry
  • Physical Chemistry
  • Mass Spectrometry

Background:

  • Gas-phase ion parking is crucial for analyzing high-mass ions in native mass spectrometry.
  • Understanding ion behavior under resonance excitation is essential for optimizing ion trapping.
  • Previous models lacked detailed explanations for high-mass ion parking mechanisms.

Purpose of the Study:

  • To develop and validate a forced, damped harmonic oscillator model for gas-phase ion parking.
  • To investigate the factors influencing ion parking efficiency for high-mass ions.
  • To provide a semi-quantitative prediction of ion trapping performance under various conditions.

Main Methods:

  • Development of a forced, damped harmonic oscillator model.
  • Application of the model to high-mass ions (17 kDa, 467 kDa, 2 MDa).
  • Experimental validation using horse skeletal muscle myoglobin and β-galactosidase ions.

Main Results:

  • Ion secular frequency spacings are constant between adjacent charge states and decrease with protein mass.
  • Ion parking is primarily driven by oppositely charged ion cloud separation, with less influence from resonance excitation velocity.
  • Parked ion cloud size limits ion parking at high m/z ratios; off-target ion parking is sensitive to bath gas pressure.

Conclusions:

  • The model accurately predicts ion parking behavior for high-mass proteins.
  • Efficient ion parking is achievable for 17 kDa and 467 kDa proteins under accessible trapping conditions.
  • Decreasing charge states lead to larger ion clouds, hindering efficient ion trapping.