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- W4205656944 abstract "Density-functional theory (DFT) is used to obtain the molecular data essential for predicting the reaction kinetics of chemical-ionization-mass spectrometry (CI-MS), as applied in the analysis of volatile organic compounds (VOCs). We study charge-transfer reactions from NO+ and O2+ reagent ions to VOCs related to cork-taint and off-flavor in wine. We evaluate the collision rate coefficients of ion-molecule reactions by means of collision-based models. Many NO+ and O2+ reactions are known to proceed at or close to their respective collision rates. Factors affecting the collision reaction rates, including electric-dipole moment and polarizability, temperature, and electric field are addressed, targeting the conditions of standard CI-MS techniques. The molecular electric-dipole moment and polarizability are the basic ingredients for the calculation of collision reaction rates in ion-molecule collision-based models. Using quantum-mechanical calculations, we evaluate these quantities for the neutral VOCs. We also investigate the thermodynamic feasibility of the reactions by computing the enthalpy change in these charge-transfer reactions." @default.
- W4205656944 created "2022-01-25" @default.
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- W4205656944 date "2022-01-12" @default.
- W4205656944 modified "2023-09-30" @default.
- W4205656944 title "Theoretical Investigation of Charge Transfer from NO<sup>+</sup> and O<sub>2</sub><sup>+</sup> Ions to Wine-Related Volatile Compounds for Mass Spectrometry" @default.
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- W4205656944 doi "https://doi.org/10.1021/jasms.1c00253" @default.
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