Method and device for transport of ions in gas through a capilla

Radiant energy – Ionic separation or analysis – With sample supply means

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250282, B01D 5944, H01J 4900

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active

057367400

ABSTRACT:
The invention relates to methods and devices for transporting ions in a laminar gas flow through a tube, preferably through a capillary tube. During the transport, the ions must not touch the wall of the capillary or else they will be discharged upon collision with the wall. The invention consists of keeping the ions in the gas flow free of any wall collisions by gas-dynamic focussing of the ions into the center of the gas stream. Focussing is achieved when the ions are decelerated by an electric field relative to the gas flow so that they have a lower transport velocity than the gas stream. Due to the parabolic velocity profile of the laminar gas stream, ions which are not at the center of the capillary are subjected to circumference by gas with different velocities at both sides, resulting in a force toward the capillary axis. This component of force is the stronger the farther the ions are away from the center axis and the more they are decelerated.

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patent: 5543618 (1996-08-01), D'Silva
Baiwei Lin et al. Ion Transport by Viscous Gas Flow through Capillaries, American Society for Mass Spectrometry, vol. 5, pp. 873-885, Jun. 7, 1994.
C.M. Whitehouse et al., Electrospray Interface for Liquid Chromatographs and Mass Spectrometers, American Chemical Society, vol. 57, No. 3, pp. 675-679, Mar. 1985.

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