Electrical field lines in the vicinity of shutter grids from the simulations for four different blocking voltages with a superimposed drift field of 275 V/cm: (a) 0 V, (b) 15 V, (c) 23.4 V, and (d) 50 V.
Dynamic models of the ion shutter with a pulse duration of 0.1 ms and for ions with a mobility of : (a) the profile of the shutter pulse waveform; (b) the distribution of ions at an observation time of 0.1 ms; (c) at an observation time of 0.35 ms.
Results of dynamic simulations for the drift field value of 275 V/cm plotted as (a) ion density as a function of the distance from the shutter center for blocking voltages of 15 V (squares), 23.4 V (circles), and 50 V (triangles); (b) corresponding values of peak areas calculated from the plots in (a) as a function of shutter blocking voltage.
The influence of the electric field variation in the drift tube on mobility spectra of reactant ions at ambient temperature for shutter blocking voltages of 50, 45, 40, 35, 30, 25, and 20 V that correspond to individual mobility spectra shown with numeric labels from 1, 2, 3, 4, 5, 6, and 7, respectively. The values of the drift field are as follows: (a) 175, (b) 275, and (c) 375 V/cm.
Plots of ion count for reactant ions as a function of (a) shutter field and (b) normalized to corresponding drift field values at ambient temperature for the following values: rectangles, 175 V/cm; circles, 225 V/cm; triangles, 275 V/cm; stars, 325 V/cm; and diamonds, 375 V/cm.
Linear correlation of ion peak area with mobility coefficient obtained from simulations.
Plots of peak area as a function of shutter electric field for (a) three ketones and (b) the reactant ion at different drift gas temperatures.
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