title: Linear ion trap mass selectivity with impulse power supply and sinusoidal dipolar excitation.
abstract: BACKGROUND
  An ion trap mass analyzer can be operated by either a sinusoidal waveform power supply or an impulse waveform power supply. The optimal conditions for the performance of ion trap which is driven by an impulse waveform power supply with sinusoidal dipolar voltage were investigated theoretically, and further verified by experiments.
  
  
  METHODS
  The analytical relationship between β and q values is derived theoretically for optimal performance, and the dependencies β(q) for different trapezoidal waveforms are studied. To explain the dependence of resolution with working point q, the derivative dβ/dq is also derived analytically for the case of a rectangular waveform power supply. The theoretical results are further verified by experiments.
  
  
  RESULTS
  The results from both theoretical calculations and experiments are in very good agreement. The behaviour resolution with q is controlled by the dispersion dβ/dq that was also confirmed by experiments, when the resolution increases with q.
  
  
  CONCLUSIONS
  The optimal conditions of β, qexvalues and required excitation time n are when S(q) is close to 1 for an ion trap driven by trapezoidal waveform voltage with sinusoidal dipolar voltage. It shown that with increasing impulse parameter τ the dispersion dβ/dq decreases and the mass resolution also decreases as result. In the case of applying a rectangular waveform shape voltage, the mass selectivity is the same as for the sinusoidal wave shape. Copyright © 2016 John Wiley & Sons, Ltd.
authors.affiliation: Department of Electronic Engineering, Fudan University, Shanghai, 200433, China.|Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Department of Chemistry and Laser Chemistry Institute, Fudan University, 220 Handan Road, Shanghai, China.
authors.forename: Fuxing
authors.initials: F
authors.lastname: Xu
authors.affiliation: Physical and Mathematical Department, Ryazan State University, Ryazan, Svoboda 46, 390000, Russian Federation.
authors.forename: Nikolai V
authors.initials: NV
authors.lastname: Konenkov
authors.affiliation: Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Department of Chemistry and Laser Chemistry Institute, Fudan University, 220 Handan Road, Shanghai, China.
authors.forename: Hangyu
authors.initials: H
authors.lastname: Ding
authors.affiliation: Department of Electronic Engineering, Fudan University, Shanghai, 200433, China.
authors.forename: Yuanyuan
authors.initials: Y
authors.lastname: Wang
authors.affiliation: Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Department of Chemistry and Laser Chemistry Institute, Fudan University, 220 Handan Road, Shanghai, China.
authors.forename: Chuan-Fan
authors.initials: CF
authors.lastname: Ding