ION SELECTING DEVICE FOR IDENTIFICATION OF IONS IN GASEOUS MEDIA

ION SELECTING DEVICE FOR IDENTIFICATION OF IONS IN GASEOUS MEDIA

A differential mobility analyser (DMA) comprises ion separation chamber 2 and focusing chamber 16. Sample gas containing ions of different ion mobilities enters the focusing chamber from inlet 15 at a predetermined flow rate. A non-uniform charge density on surfaces 17 and 18 creates a non-uniform e...

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1. Verfasser: GORBUNOV, Boris Zachar
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Sprache:eng
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BASIC ELECTRIC ELEMENTS
ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
ELECTRICITY
INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES
MEASURING
PHYSICS
TESTING
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description A differential mobility analyser (DMA) comprises ion separation chamber 2 and focusing chamber 16. Sample gas containing ions of different ion mobilities enters the focusing chamber from inlet 15 at a predetermined flow rate. A non-uniform charge density on surfaces 17 and 18 creates a non-uniform electric field in focusing zone 14, causing trajectories 19-21 of ions in the sample gas to converge. Ion stream 22 passes through sample gas inlet 30 into the ion separation chamber, in which sheath gas flows from inlet 5 to outlet 11 at a predetermined flow rate. The focusing chamber is at an angle of 30-90° to the sheath gas flow direction. Electrodes 6 and 7 provide an ion-separating electric field across the ion separation chamber, the field strength chosen such that ions of predetermined mobility follow trajectory 22 and are collected at ion outlet 9.
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subjects BASIC ELECTRIC ELEMENTS
ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
ELECTRICITY
INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES
MEASURING
PHYSICS
TESTING
title ION SELECTING DEVICE FOR IDENTIFICATION OF IONS IN GASEOUS MEDIA
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