Search Results - william+siems

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A Two-Phase Approach for Time-Domain Ion Mobility Mass Spectrometry
SummaryDrift-tube ion mobility spectrometry (DT-IMS) is largely unmatched in its ability to rapidly screen passengers, cargo, and the surrounding environment for narcotics, explosives, and chemical warfare agents. However, DT-IMS are limited by duty cycle. Most experiments are on the order of < 1%, and this limitation impacts sensitivity. In addition,...
Published: 5/25/2023   |   Inventor(s): Brian Clowers, William Siems
Voltage Sweep Ion Mobility Spectrometry
AbstractIon mobility spectrometry (IMS), is a powerful tool commonly used for security applications (e.g. search for explosives, narcotics, and other trace contrabands) but it doesn’t achieve optimal separation power with both small and large ions simultaneously. Similar to the general elution problem of chromatographic experiments, small ions...
Published: 5/25/2023   |   Inventor(s): Herbert Hill, Eric Davis, William Siems, Michael Williams
Keywords(s): Instrumentation/Equipment
A New Gas-Phase Atmospheric Pressure Ion Detection Mechanism
AbstractResearchers at WSU have produced a novel Radiative Ion-Ion Recombination: A New Gas-Phase Atmospheric Pressure Ion Detection Mechanism.All the present atmospheric ion detectors including flame ionization detectors and ion mobility spectrometers utilize Fraday plate designs for ion detection. These plates collect charge and convert it to amplified...
Published: 4/28/2023   |   Inventor(s): Eric Davis, William Siems, Herbert Hill
Keywords(s): Instrumentation/Equipment