Ion mobility measurement at a potential barrier

Details Ion mobility measurement at a potential barrier Ion mobility measurement at a potential barrier

2009-08-27

2011-12-20

Johnston, Phillip A (Department: 2881)

Radiant energy

Ionic separation or analysis

Cyclically varying ion selecting field means

C250S282000, C250S288000

Reexamination Certificate

active

08080787

ABSTRACT:
Ion mobilities are measured by entraining the ions in a gas and adiabatically expanding the ion-containing gas through a nozzle to form a gas jet. An electrical field barrier with variable height is located at the nozzle exit. The field barrier may be located adjacent to the nozzle exit or an ion guide may be located between the nozzle and the field barrier. If a continuous ion current is supplied, the height of the barrier is varied and the ion current of the ions passing over the barrier is measured, the ion current can be differentiated to generate a mobility spectrum. Alternatively, the ions can be temporarily stored in the ion guide so that measurement of the ion current of the ions passing over the barrier results in a direct measurement of the mobility spectrum.

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Page, et al., “Variable Low-Mass Filtering Using an Electrodynamic Ion Funnel,” Journal of Mass Spectrometry, vol. 40, pp. 1215-1222, 2005.

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