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• W2068124486 abstract "Ion mobility spectrometry is widely used in national defense areas, and field-deployed IMS units are subject to various environmental conditions; one of the most important and least controlled being the humidity of the sample and drift gas. Varying drift gas water content can significantly alter the drift time and reduce the mobility constant (K0 value) of the ion. While the effect of drift gas water content has been previously characterized, no means to quantitatively measure the water content of the drift gas under field conditions have been developed. In this work, using an IMS-TOFMS instrument capable of high precision (±0.005 cm2 V−1 s−1 or better) measurements of K0 values, we investigated the protonated monomer and proton-bound dimer ions of dimethyl methylphosphonate as standards that are sensitive and insensitive, respectively, to the formation of water cluster ions. It was found that the ratio of mobilities of these two ions could measure the water content of the drift gas in field-deployed instruments. When water vapor was added in the presence of an ammonia dopant, K0 was found to decrease as a function of water content to a lesser degree than under conditions without dopant. This study was conducted at atmospheric pressure and at temperatures from 30 °C to 150 °C. The experimental data were supported by complementary density functional theory calculations that examined the interactions of the DMMP monomer with successive number of waters. The reduced ion mobility cross-sections in N2 were subsequently predicted using the trajectory method." @default.
• W2068124486 created "2016-06-24" @default.
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• W2068124486 date "2014-07-01" @default.
• W2068124486 modified "2023-10-14" @default.
• W2068124486 title "Determining the water content of a drift gas using reduced ion mobility measurements" @default.
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• W2068124486 doi "https://doi.org/10.1016/j.ijms.2014.05.010" @default.
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