Publications by authors named "Timothy Willy"
Response of an ion mobility spectrometer at ambient pressure was quantitatively determined for fourteen chemicals from five chemical families spanning a range of proton affinities and temperature from 30 to 175 °C with moisture from 1 to 1 × 10 ppm in purified air. Peak intensities, drift times and reduced mobility coefficients were determined for hydrated protons from aNi ion source and for protonated monomers and proton bound dimers of alcohols, aldehydes, acetates, ketones, and organophosphates. These measurements permitted the determination of response factors with atmospheric pressure chemical ionization and the influence of moisture and temperature on APCI response with correlation to computational models of hydration values.
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- A tandem ion mobility spectrometer was developed featuring a thermal desorption inlet, dual drift regions, and electric field components that enable isolation and decomposition of ion swarms.
- In this system, ions like NO3- and NO2- were analyzed, achieving a decomposition rate between 60-90% based on various factors such as gas temperature and ion type.
- The study shows that this technology can enhance the detection of explosives while minimizing false positives when faced with interference from other substances.