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• W824001066 abstract "word count 285) Unlike the parent ion of camphene at m/z 136, isolated fragment ions of camphene and α-pinene at m/z 93 and 121 did not show any metastable product ions up to 500 s unimolecular reaction delay. The isolated fragment ions of camphene and α-pinene at m/z 93 and 121 reacted with their respective terpene neutrals to produce [M + H] at m/z 137. A minor reaction channel for α-pinene fragment ions at m/z 93 was the formation of a charge transfer product at m/z 136. Both camphene and α-pinene fragment ions at m/z 93 were 100% reactive. Conversely, < 50% of the camphene or α-pinene fragment ions at m/z 121 were reactive and produced [M + H] self -chemical ionization (SCI) product ions at m/z 137 as the major product ion. Proton affinity (PA) bracketing experiments, PA additivity schemes, and alkene PA vs. adiabatic ionization energy (IE) linear correlation indicated that the PAs of camphene and α-pinene are comparable (~ 210 ± 2 kcal mol). Selected waveform inverse Fourier transform (SWIFT) isolated thermalized [M + H] ions of C1 α-pinene (m/z 138), C1 camphene (m/z 138), and pyrrole (m/z 68) protonated camphene or α-pinene immeasurably slowly. Conversely, the corresponding non-thermalized [M + H] species of α-pinene, camphene, and pyrrole protonated camphene or α-pinene efficiently. The observed [M + H] SCI terpene ions were mainly the products of various fragment ion reactions. The internally excited molecular radical cations of camphene made a minor contribution to [M + H] of camphene. The α-pinene molecular ions showed no SCI reactivity. A simple model was used to predict SCI mass spectral appearances of α-pinene and camphene based on the experimental kinetic data and as a function of pressure and time." @default.
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• W824001066 date "2005-01-01" @default.
• W824001066 modified "2023-09-26" @default.
• W824001066 title "Improving Performance Characteristics of Hyphenated Preconcentrator GC Fourier Transform Ion Cyclotron Resonance Mass Spectrometry: A Gold Standard for Sensor Development" @default.
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