Ion mobility spectrometer
Ion mobility spectrometer

Ion mobility spectrometer ion mobility spectrometry (IMS), also known as ion mobility spectroscopy, is a new gas phase separation and detection technique that emerged in the early 1970s. It uses the difference in ion drift time for ion separation and characterization. With the concept of chromatographic retention time, it was originally called plasma chromatography. In the early research work, the simple structure and high sensitivity of the IMS device (detection limit of ng or even pg grade) have caused great interest. The early development of IMS technology was mainly in the detection of explosives and poisons. In the early 1980s, military field detection instruments were developed. However, due to the low resolution and the poor understanding of the characteristics of ionization under atmospheric pressure at the time, the development of civilian use was slow. In the 1990s, with the increase of publicly-published literature and the introduction of commercial ion mobility spectrometers, the number of institutions and researchers studying IMS technology has increased internationally. In recent years, the demand for counter-terrorism and illicit drugs has greatly promoted the development of highly sensitive and highly selective testing equipment on site. EBG is particularly suitable for trace detection of volatile organic compounds, such as chemical warfare agents, drugs, explosives, and air pollutants. It has been widely used in airport security and field exploration, and it has been used in environmental monitoring, industrial production, etc. application.


Fundamental

After the sample is carried by the carrier gas into the ionization reaction zone, a series of ionization reactions and ion-molecule reactions take place between the carrier gas molecule and the sample molecule under the action of the ion source to form various product ions. Driven by the electric field, these ions enter the drift region through periodically opened ion gates. In the course of continuous collision with the countercurrent neutral drift gas molecules, different ions are separated in the electric field due to their different rates of migration in the electric field, and the different ions are separated, and reach the collector sequentially.

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