Ion Mobility Spectrometry

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."

Sample of Sources Used:

• Buryakov, I., Krylov, E., Makas, A., E.G.Nazarow, Pervukhin, V., & Rasuluv, U. (Vol 48, 1993). Journal of Analyical Science , 114.
• Buttigieg, G. A., Knight, A. K., Denson, S., Pommier, C., & Denton, M. B. (Vol 135, 2003). Characterization of the Explosive Triaceton Triperoxide and Detection by Ion Mobility Spectrometry. Forensic Science International , 53-59.
• C.A.Hill, & C.L.P.Thomas. (Vol 128, 2003). A Pulsed Corona Discharge Switchable High Resolution Ion Mobility Spectrometer-Mass Spectrometer. The Analyst , 55-60.
• Creaser, C. S., Griffiths, J. R., Bramwell, C. J., Noreen, S., & Hill, C. A. (Vol 129, 2004). Ion Mobility Spectrometry: A review. Part 1. Structural Analysis by mobility measurement. The Analyst , 984-994.
• G.A.Eiceman. (Vol 21, No 4, 2002). Ion Mobility Spectrometry as a Fast Monitor of Chemical Composition. Trends in Analytical Chemistry , 259-275.

More papers on Ion Mobility Spectrometry:

• Analytical Essay # 144395 : "Mobility Management in IPV4 and IPV6"
• Term Paper # 33510 : "Mobility Pattern And Broadband Networks"
• Essay # 88276 : "Social Mobility in Industrialized vs. Developing Nations"

APA Citation:

MLA Citation: