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- W2089190773 abstract "In a typical pulsed ion cyclotron resonance (ICR) experiment, gaseous ions formed by a pulsed electron beam are trapped by static electric and magnetic fields. The ions are trapped efficiently for several tenths of a second, but collisions with neutral molecules cause them to diffuse gradually to the walls of the analyzer cell. In this paper the diffusion of ions in an ICR trapped-ion analyzer cell is modeled theoretically, and the results are compared with experimental data obtained at a variety of pressures and trapping voltages. The theoretical model assumes that the dominant loss mechanism is diffusion of the ions to the upper and lower plates of the analyzer cell under the influence of an electrostatic trapping field. The theoretical results for the time dependence of the ion concentration in the ICR analyzer cell are in good agreement with experimental time plots. A useful parameter for characterizing ion trapping efficiency is t12, the time taken by the ion concentration to decrease to one-half of its initial value. The theoretical expression for t12 shows that it is proportional to (aB2)/PV, where B is the magnetic field strength, a is the distance between the walls of the ICR analyzer cell, P is the pressure in the cell, and V is the electrostatic trapping voltage." @default.
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- W2089190773 date "1983-05-01" @default.
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- W2089190773 title "A diffusion model for nonreactive ion loss in pulsed ion cyclotron resonance experiments" @default.
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- W2089190773 doi "https://doi.org/10.1016/0020-7381(83)80006-0" @default.
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