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Localizing and Reducing the Area of Activation in Plasma Chromatography

IP.com Disclosure Number: IPCOM000086255D
Original Publication Date: 1976-Aug-01
Included in the Prior Art Database: 2005-Mar-03
Document File: 2 page(s) / 31K

Publishing Venue

IBM

Related People

Morrissey, JM: AUTHOR

Abstract

In plasma chromatography a sample is heated to vaporize volatile materials which are carried into the ionization chamber. Here, the material is ionized and accelerated into the drift chamber against a countercurrent drift gas. The time it takes to traverse the drift chamber is a function of the electric field between the ionized molecules, the accelerating electrode and the size of the molecules among others. Different molecules will then be detected and assigned to a channel of the multichannel analyzer as a function of drift time. The sample area is generally restricted to the smallest physically divisable piece or particle.

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Localizing and Reducing the Area of Activation in Plasma Chromatography

In plasma chromatography a sample is heated to vaporize volatile materials which are carried into the ionization chamber. Here, the material is ionized and accelerated into the drift chamber against a countercurrent drift gas. The time it takes to traverse the drift chamber is a function of the electric field between the ionized molecules, the accelerating electrode and the size of the molecules among others. Different molecules will then be detected and assigned to a channel of the multichannel analyzer as a function of drift time. The sample area is generally restricted to the smallest physically divisable piece or particle.

The use of a laser to locally heat a very small area of the sample without physically destroying it has a very distinct advantage, in that it allows very small adjacent areas to be activated. In this way a line or area scan of materials on the surface can be made to determine the material profile of the surface.

Also, two different samples, one a standard, may be compared in the same chamber.

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