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A planar tandem differential mobility spectrometer was integrated with a middle reactive stage to fragment ions which were mobility selected in a first analyzer stage using characteristic compensation and separation fields. Fragmentation occurred in air at ambient pressure of 660 Torr (8.8 kPa) with electric fields of 10 to 35 kV cm −1 (E/N of 52 to 180 Td) between two 1 mm wide metal strips, located on each analyzer plate between the first and second mobility stages. Field induced fragmentation (FIF) spectra were produced by characterizing, in a last stage, the mobilities of fragment ions from protonated monomers of 43 oxygen-containing volatile organic compounds from five chemical classes. The extent of fragmentation was proportional to E/N with alcohols, aldehydes, and ethers undergoing multiples steps of fragmentation; acetates fragmented only to a single ion, protonated acetic acid. In contrast, fragmentation of ketones occurred only for methyl i-butyl ketone and 2-hexanone. Fragment ion identities were supported by mass-analysis and known fragmentation routes and suggested that field induced fragmentation at ambient pressure can introduce structural information into FIF spectra, establishing a foundation for chemical identification using mobility methods.more » « less
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Fowler, P. E. ; Tarassov, A. ; Lee, G-I. ; Pasupuleti, D. ; Ray, A. ; Eiceman, G. A. ( , International Journal for Ion Mobility Spectrometry)
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Mukherjee, A. ; Ellis, C. T. ; Arik, M. M. ; Taheri, P. ; Oliverio, E. ; Fowler, P. ; Tischler, J. G. ; Liu, Y. ; Glaser, E. R. ; Myers-Ward, R. L. ; et al ( , Physical Review B)