An analysis of the use of ion mobility spectrometry in the detection of explosives.
Written in 2008; 1,928 words; 15 sources; MLA; $ 61.95
Paper Summary:
This paper examines how ion mobility spectrometry (IMS) is one of the most widely used and most promising of the methods available for the detection and identification of explosives today. It looks at how two independent principles and the foundations of this technique are that ions can be created at ambient pressure from radioactive materials and how these gas phase ions can be characterized rapidly for mobility in weak electric fields. Several diagrams are included with the paper.
Outline:
Introduction
How it Works
Instrumentation
Sample Introduction
Ion Formation
From the Paper:
"The electric field is established via a voltage divider and a series of conducting rings stacked between the ion shutter and the detector. In the drift region, there is a drift gas at constant pressure, which may be between 1 Torr and atmospheric pressure depending on the configuration of the IMS instrument. The ions experience a number of collisions as they pass through the buffer gas. These collisions hinder the ions progress to the detector. Larger ions move slower through the drift tube due to greater collision cross sections causing more collisions. Smaller ions, on the other hand, move faster as their collision cross section is smaller and therefore they encounter fewer collisions. This explains how the separation via shape and size is possible."
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