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Dipolar excitation in the third stability region.
Nikolai V Konenkov1, Eugenii Ya Chernyak2, Vladimir A Stepanov3
1Ryazan State University, Svoboda Str., 46, Ryazan, 390000, Russian Federation. n.konenkov@rsu.edu.ru.
European Journal of Mass Spectrometry (Chichester, England)
|August 25, 2016
Summary
Dipole resonant excitation enhances ion analyzer resolution and transmission. This study optimizes mass peak shape by adjusting resonance frequency and dipolar potential amplitude in the third stability region.
Area of Science:
- Mass spectrometry
- Ion optics
- Analytical chemistry
Background:
- Dipole resonant excitation creates ion instability bands.
- These bands are most effectively excited at the fundamental frequency π = βΩ/2.
Purpose of the Study:
- To investigate mass peak shape in the third stability region using dipolar resonance excitation.
- To analyze the impact of resonance frequency and dipolar potential amplitude on peak shape and ion transmission.
Main Methods:
- Numerical integration of ion motion equations.
- Simulation of ion trajectories with given ion source emittance.
- Calculation of mass peak shape for quadrupoles with round rods.
Main Results:
- Resolution power can be varied within the third stability region.
- Dipolar potential phase changes lead to periodic resolution variations.
- Optimal peak shape achieved with r/r0=1.130 for round rods.
- Dipolar excitation increases transmission by 5-10%.
Conclusions:
- Dipole resonant excitation offers control over mass peak shape and resolution.
- Optimized excitation parameters improve ion transmission efficiency.
- Findings are applicable to quadrupole mass analyzers with round rods.
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